Union Wartime Organisation: Eastern and Capital Theatre

Union Wartime Organisation

Eastern and Capital Theatre

April 1861-June 1865

Summary

This theatre broadly covers the states of Virginia, Maryland, Delaware, Pennsylvania, West Virginia, District of Columbia, and adjacent operational regions.

Operations in the theatre were dominated by the fact that the two capitals at Washington, DC, and Richmond, Virginia, were barely one hundred miles apart. Virginia inevitably became a primary theatre of the conflict as each belligerent sought to threaten the other’s capital city while defending its own. Each side had to provide for the defence of its capital, but the urgency was greater on the Union side, tying down large forces to occupy Washington’s extensive fortifications and to counter Confederate diversions and threats.

The Union had to take the strategic initiative and attempted several overland advances towards Richmond, with occasional efforts made from the coast along the James River and Yorktown Peninsula. The Confederates responded aggressively and made diversionary advances and invasions towards Washington and across the Potomac River into Union territory. This required the Union to make continual adjustments to the military organisation north of the Potomac, which could raise short-term forces, forestall and react to raids, and provide security for the Northern hinterland.

At times Union forces based on either side of the James River synchronised their operations with the main Army of the Potomac, but more frequently they were focused on guarding and extending the garrisons established along the Virginia and North Carolina coasts. They could harass and make diversionary operations, but it was not until Spring 1864 that the integration of overland and coastal operations was accomplished. The primary instrument for action in this sector was the Department of Virginia, initially established in May 22 1861 only to hold Fortress Monroe but expanding to become a major force. In July 1863 it was merged with the Department of North Carolina into a new Department of Virginia and North Carolina so that operations along the Atlantic coast and rivers in both states could be coordinated more efficiently.

Both sides engaged continually in operations in the Shenandoah Valley and the mountainous region of western Virginia. The Valley was an important source of supplies for the Confederates and offered a covered line of advance into Union territory, an advantage that was exploited effectively in 1862, 1863, and 1864. The general south-westward orientation of the valley meant that any Union advance would gradually diverge and dissipate forces away from the main axis between Washington and Richmond.

Western Virginia was largely pro-Unionist and provided a base for Union operations towards prized natural resources and the vital East-West railroad line through eastern Tennessee and southwestern Virginia. The region was inaccessible to large forces and difficult either to occupy or defend but it constantly drew the attention of both sides. Difficult to conquer and garrison, there were many intense but short campaigns and raids. It was only in late 1864 and early 1865 that the Union forces were able to move in force out of the mountains into eastern Tennessee, southwestern Virginia and western North Carolina.

The defence of the national capital was always a sensitive issue as its loss would have led to disastrous political and diplomatic consequences. The Department of Washington was founded immediately in April 1861. In July 1861 it was subordinated to the Military Division and then converted into a District of the Department of the Potomac, to ensure that the security of the capital remained an integral responsibility for the main field forces in the eastern theatre. In February 1863, it was reinstated as the Department of Washington with its own Districts established for the defence of, and to provide logistical services around, the capital.

In the immediate crisis of the outbreak of war, short-lived organisations were formed partly in response to immediate or perceived threats and partly to provide a focal point for recruitment and training. These included the Department of Pennsylvania and the Department of the Shenandoah from April to August 1861, and the Department of Annapolis and its successor Department of Maryland from April to July 1861. These were swept away by McClellan as he consolidated centralised command in his Military Division, later Department of the Potomac. The field forces gathered for the first advance into Virginia in the early months of the war were assigned to the Department of Northeastern Virginia in May 27 1861 as the Army of Northeastern Virginia, and it was clearly differentiated from the capital’s defence force. After the defeat at First Bull Run, in July 1861, the Military Division of the Potomac replaced the Department. In August 1861, the Department of the Potomac and the Army of the Potomac, always the largest single field force, were created and remained operational until June 1865. This command was the constant fixation of government, press, and people, and it became all but synonymous with the conduct of the war in the eastern theatre.

Union High Command on April 9 1861 Eastern and Capital Theatre

  • Department of the East: John Ellis Wool
  • Department of Washington established: Charles Ferguson Smith awaited

Department of Washington

(Established, April 9 1861-July 25 1861, transferred to Military Division of the Potomac)

  • Charles Ferguson Smith (April 9 1861-April 21 1861)
  • Robert Patterson (April 22 1861-April 26 1861 interim April 27 1861)
  • Joseph King Fenno Mansfield (April 27 1861-July 25 1861)

April 9 1861: The Department of Washington was established, comprising the original boundaries of the District of Columbia (including Alexandria County, Virginia) and the state of Maryland as far south as Bladensburg, taken from the Department of the East. Lieutenant-Colonel Charles Ferguson Smith was appointed to command the Department of Washington, arriving on 10th April 1861. Colonel Charles W Sandford took de facto temporary command of all field forces on the Virginia side of the Potomac River.

April 10 1861: Lieutenant-Colonel Charles Ferguson Smith arrived to command the Department of Washington.

April 19 1861: The states of Pennsylvania and Delaware were transferred from the Department of the East to the Department of Washington.

April 22 1861: Pennsylvania State Major-General Robert Patterson assumed command of the Department of Washington.

April 27 1861: The Department of Washington was extended to include the District of Columbia, and Maryland as far as Fort Washington and Bladensburg, Maryland. Pennsylvania and Delaware were transferred from the Department of Washington to the Department of Pennsylvania. Colonel Joseph King Fenno Mansfield was appointed to command the Department of Washington, arriving on 28th April 1861.

April 28 1861: Colonel Joseph King Fenno Mansfield arrived to assume command of the Department of Washington, succeeding Pennsylvania State Major-General Robert Patterson.

July 25 1861: The Department of Washington transferred to the Military Division of the Potomac. Prince George’s, Montgomery and Frederick counties of Maryland were transferred from the Department of Pennsylvania to the Department of Washington.


Department of Annapolis

Union High Command on April 27 1861 Eastern and Capital Theatre

  • Department of Annapolis established: Benjamin Franklin Butler awaited
  • Department of Pennsylvania established: Robert Patterson assumed
  • Department of Washington adjusted: Lieutenant-Colonel Charles Ferguson Smith interim, Joseph King Fenno Mansfield awaited

(Established, April 27 1861-July 19 1861, discontinued, to Department of Maryland)

  • Benjamin Franklin Butler, George Cadwalader (April 27 1861-May 15 1861)
  • John Adams Dix (May 16 1861-May 31 1861 interim June 10 1861),
  • Nathaniel Prentiss Banks (June 1 1861-July 19 1861)

April 27 1861: The Department of Annapolis was established to include the counties 20 miles each side of the Baltimore and Washington railroad from Annapolis as far as Bladensburg, Maryland. Massachusetts State Brigadier-General Benjamin Franklin Butler was appointed to command the Department of Annapolis but did not arrive to take command.

May 15 1861: Pennsylvania State Major-General George Cadwalader assumed command of the Department of Annapolis, succeeding Major-General Benjamin Franklin Butler who had not assumed command.

May 16 1861: Major-General John Adams Dix assumed command of the Department of Annapolis, succeeding State Major-General George Cadwalader.

June 1 1861: Major-General Nathaniel Prentiss Banks was appointed to command the Department of Annapolis, arriving on 11th June 1861, succeeding Major-General John Adams Dix.

June 11 1861: Major-General Nathaniel Prentiss Banks arrived to command the Department of Annapolis, succeeding Major-General John Adams Dix.

July 19 1861: The Department of Annapolis was discontinued, and reorganised as the Department of Maryland.


Department of Pennsylvania

Union High Command on April 27 1861 Eastern and Capital Theatre

  • Department of Annapolis established: Benjamin Franklin Butler awaited
  • Department of Pennsylvania established: Robert Patterson assumed
  • Department of Washington adjusted: Lieutenant-Colonel Charles Ferguson Smith interim, Joseph King Fenno Mansfield awaited

(Established, April 27 1861-August 17 1861, discontinued, to Department of the Potomac)

  • Robert Patterson (April 27 1861-August 17 1861)

April 27 1861: The Department of Pennsylvania was established with headquarters at Philadelphia, comprising Pennsylvania, Delaware and parts of Maryland not in the Department of Washington and the Department of Annapolis. Pennsylvania and Delaware were transferred from the Department of Washington to the Department of Pennsylvania. Pennsylvania State Major-General Robert Patterson assumed command of the Department of Pennsylvania.

May 9 1861: The Department of the Ohio was extended to include the parts of Pennsylvania and Virginia north of the Kanawha River and west of the Greenbrier River, and on a line drawn from the Greenbrier River to the southwest corner of Maryland, then to the Pennsylvania border and to the northeast corner of McKean County, Pennsylvania, to its existing territory of Illinois, Ohio and Indiana. These territories were detached from the Department of the East and the Department of Pennsylvania.

June 2 1861: The Army of the Shenandoah (also known unofficially as the “Army of Pennsylvania”) was established in the Department of Pennsylvania.

July 25 1861: Prince George’s, Montgomery and Frederick counties of Maryland were transferred from the Department of Pennsylvania to the Department of Washington. Washington and Allegheny counties of Maryland were transferred from the Department of Pennsylvania to the Department of the Shenandoah. The Department of Maryland was discontinued, and incorporated into the Department of Pennsylvania. All the parts of Pennsylvania in the Department of the Ohio were transferred to the Department of Pennsylvania. All the parts of Pennsylvania in the Department of Maryland were transferred to the Department of Pennsylvania. Major-General John Adams Dix assumed command of the Department of Pennsylvania, succeeding State Major-General Robert Patterson.

August 17 1861: The Department of Pennsylvania was discontinued, and incorporated into the Department of the Potomac. The state of Pennsylvania remained under state command. The Army of the Shenandoah was discontinued, and its forces transferred to the Army of the Potomac.

Army of the Shenandoah

(Established, June 2 1861-August 17 1861, discontinued, to Army of the Potomac)

  • Robert Patterson (June 2 1861-July 27 1861)

June 2 1861: The Army of the Shenandoah (also known unofficially as the “Army of Pennsylvania”) was established in the Department of Pennsylvania. Pennsylvania State Major-General Robert Patterson assumed command of the Army of the Shenandoah.

July 27 1861: Command of the Army of the Shenandoah became vacant when Pennsylvania State Major-General Robert Patterson mustered out.

August 17 1861: The Army of the Shenandoah was discontinued, and its forces transferred to the Army of the Potomac.


Department of Virginia

Union High Command on May 22 1861 Eastern and Capital Theatre

  • Department of Annapolis: John Adams Dix
  • Department of Pennsylvania: Robert Patterson
  • Department of Virginia: Benjamin Franklin Butler
  • Department of Washington: Joseph King Fenno Mansfield

(Established, May 22 1861-July 15 1863, discontinued, to Department of Virginia and North Carolina)

  • Benjamin Franklin Butler (May 22 1861-August 8 1861 interim August 16 1861)
  • John Ellis Wool (August 9 1861-June 1 1862 interim June 16 1862)
  • John Adams Dix (June 2 1862-April 5 1863)
  • Erasmus Darwin Keyes (April 6 1863-July 15 1863)

May 22 1861: The Department of Virginia was established with headquarters at Fortress Monroe, comprising the territory of Virginia within sixty miles of Fort Monroe, detached from the Department of the East. It also assumed authority over any territories of North Carolina and South Carolina to be occupied by Union forces. Major-General Benjamin Franklin Butler assumed command of the Department of Virginia.

August 9 1861: Brigadier-General John Ellis Wool was appointed to command the Department of Virginia, arriving on 17th August 1861, to succeed Major-General Benjamin Franklin Butler.

August 17 1861: Brigadier-General John Ellis Wool arrived to command the Department of Virginia, succeeding Major-General Benjamin Franklin Butler.

June 1 1862: The parts of Virginia south of the Rappahannock River and east of the Fredericksburg & Richmond Railroad were transferred from the Department of the Potomac to the Department of Virginia.

June 1 1862: Major-General George Brinton McClellan was appointed to command the Department of Virginia but did not arrive to take command.

June 2 1862: Major-General John Adams Dix was appointed to command the Department of Virginia, arriving on 17th June 1861, succeeding Major-General John Ellis Wool.

June 17 1862: Major-General John Adams Dix arrived to command the Department of Virginia, succeeding Major-General Benjamin Franklin Butler.

July 22 1862: VII Corps (Virginia) was established in the Department of Virginia, comprising forces based at Fortress Monroe, Camp Hamilton, Norfolk, Suffolk, Portsmouth and Yorktown in Virginia.

August 3 1862: IX Corps transferred from the Army of the Potomac to the Department of Virginia.

August 16 1862: IV Corps (Potomac) transferred from the Army of the Potomac to the Department of Virginia.

September 3 1862: IX Corps (Virginia) transferred from the Department of Virginia to the Army of the Potomac.

February 5 1863: IX Corps Potomac transferred from the Army of the Potomac to the Department of Virginia.

March 17 1863: IX Corps transferred from the Department of Virginia to the Department of the Ohio.

April 6 1863: Major-General Erasmus Darwin Keyes assumed command of the Department of Virginia, succeeding Major-General John Adams Dix.

July 15 1863: The Department of Virginia was discontinued, and its territory transferred to the Department of Virginia and North Carolina. IV Corps (Virginia) transferred from the Department of Virginia to the Department of Virginia and North Carolina. VII Corps (Virginia) transferred from the Department of Virginia to the Department of Virginia and North Carolina.

VII Corps Virginia

(Established, July 22 1862-July 15 1863, transferred to Department of Virginia and North Carolina)

  • John Adams Dix (July 22 1862-July 15 1863)

July 22 1862: VII Corps (Virginia) was established in the Department of Virginia, comprising forces based at Fortress Monroe, Camp Hamilton, Norfolk, Suffolk, Portsmouth and Yorktown in Virginia. Major-General John Adams Dix assumed command of VII Corps (Virginia).

July 15 1863: VII Corps (Virginia) transferred from the Department of Virginia to the Department of Virginia and North Carolina.

IX Corps Virginia

(Transferred from Army of the Potomac, August 3 1862-September 3 1862, transferred to Army of the Potomac)

  • Ambrose Everett Burnside (August 3 1862-September 3 1862)

August 3 1862: IX Corps transferred from the Army of the Potomac to the Department of Virginia. Major-General Ambrose Everett Burnside retained command of IX Corps (Virginia).

September 3 1862: IX Corps (Virginia) transferred from the Department of Virginia to the Army of the Potomac.

IV Corps Virginia

(Transferred from Army of the Potomac, August 16 1862-July 15 1863, transferred to Department of Virginia and North Carolina)

  • Erasmus Darwin Keyes (August 16 1862-July 15 1863)

August 16 1862: IV Corps (Potomac) transferred from the Army of the Potomac to the Department of Virginia. Major-General Erasmus Darwin Keyes retained command of IV Corps (Virginia).

July 15 1863: IV Corps (Virginia) transferred from the Department of Virginia to the Department of Virginia and North Carolina.

IX Corps Virginia

(Transferred from Army of the Potomac, February 5 1863-March 17 1863, transferred to Department of the Ohio)

  • William Farrar Smith (February 5 1863-March 7 1863)
  • Orlando Bolivar Willcox (temporary March 8 1863-March 17 1863)

February 5 1863: IX Corps Potomac transferred from the Army of the Potomac to the Department of Virginia. Major-General William Farrar Smith assumed command of IX Corps (Virginia).

March 8 1863: Brigadier-General Orlando Bolivar Willcox assumed temporary command of IX Corps (Virginia), succeeding Brigadier-General William Farrar Smith.

March 17 1863: IX Corps transferred from the Department of Virginia to the Department of the Ohio.


Department of Northeastern Virginia

Union High Command on May 27 1861 Eastern and Capital Theatre

  • Department of Annapolis: John Adams Dix
  • Department of Northeastern Virginia: Irvin McDowell awaited
  • Department of Pennsylvania: Robert Patterson
  • Department of Virginia: Benjamin Franklin Butler
  • Department of Washington: Joseph King Fenno Mansfield

(Established, May 27 1861-July 25 1861, transferred to Military Division of the Potomac)

  • Irvin McDowell (May 27 1861-July 25 1861)

May 27 1861: The Department of Northeastern Virginia was established, comprising the part of Virginia east of the Allegheny Mountains and north of the James River, and west of the existing Department of Virginia (within sixty miles of Fort Monroe). Its territory was detached from the Department of the East. Brigadier-General Irvin McDowell was appointed to command the Department of Northeastern Virginia, arriving on May 28 1861.

May 28 1861: Brigadier-General Irvin McDowell arrived to assume command of the Department of Northeastern Virginia.

July 8 1861: The Army of Northeastern Virginia was established in the Department of Northeastern Virginia.

July 25 1861: The Department of Northeastern Virginia transferred to the Military Division of the Potomac.

Army of Northeastern Virginia

(Established, July 8 1861-July 25 1861, discontinued, to Army of the Potomac)

  • Irvin McDowell (July 8 1861-July 25 1861)

July 8 1861: The Army of Northeastern Virginia was established in the Department of Northeastern Virginia. Brigadier-General Irvin McDowell assumed command of the Army of Northeastern Virginia.

July 25 1861: The Army of Northeastern Virginia was discontinued, and renamed the Army of the Potomac.


Department of Maryland

Union High Command on July 19 1861 Eastern and Capital Theatre

  • Department of Maryland: John Adams Dix awaited
  • Department of Northeastern Virginia: Irvin McDowell
    • Army of Northeastern Virginia: Irvin McDowell
  • Department of Pennsylvania: Robert Patterson
    • Army of the Shenandoah: Robert Patterson
  • Department of the Shenandoah: Nathaniel Prentiss Banks awaited
  • Department of Virginia: Benjamin Franklin Butler
  • Department of Washington: Joseph King Fenno Mansfield

(Established, from Department of Annapolis, July 19 1861-July 25 1861, discontinued, to Department of Pennsylvania)

  • John Adams Dix (July 19 1861-July 25 1861)

July 19 1861: The Department of Annapolis was discontinued, and reorganised as the Department of Maryland. The Department of Maryland was established, comprising the counties ten miles each side of the Baltimore and Washington railroad from Annapolis as far as Bladensburg, Maryland. Major-General John Adams Dix was appointed to command the Department of Maryland, arriving on 23rd July 1861.

July 23 1861: Major-General John Adams Dix arrived to command the Department of Maryland.

July 25 1861: The Department of Maryland was discontinued, and incorporated into the Department of Pennsylvania. All the parts of Pennsylvania in the Department of Maryland were transferred to the Department of Pennsylvania.


Department of the Shenandoah

Union High Command on July 19 1861 Eastern and Capital Theatre

  • Department of Maryland: John Adams Dix awaited
  • Department of Northeastern Virginia: Irvin McDowell
    • Army of Northeastern Virginia: Irvin McDowell
  • Department of Pennsylvania: Robert Patterson
    • Army of the Shenandoah: Robert Patterson
  • Department of the Shenandoah: Nathaniel Prentiss Banks awaited
  • Department of Virginia: Benjamin Franklin Butler
  • Department of Washington: Joseph King Fenno Mansfield

(Established, July 19 1861-August 17 1861, discontinued, to Department of the Potomac)

  • Nathaniel Prentiss Banks (July 19 1861-August 17 1861)

July 19 1861: The Department of the Shenandoah was established, comprising the Shenandoah Valley of Virginia, taken from the Department of the East. Major-General Nathaniel Prentiss Banks was appointed to command the Department of the Shenandoah, arriving on 25th July 1861. The remainder of Kentucky and the state of Tennessee not already assigned were detached from the Department of the East and assigned to the Department of the Shenandoah.

July 25 1861: Washington and Allegheny counties of Maryland were transferred from the Department of Pennsylvania to the Department of the Shenandoah. Major-General Nathaniel Prentiss Banks arrived to command the Department of the Shenandoah.

August 17 1861: The Department of the Shenandoah was discontinued, and its territory incorporated into the Department of the Potomac.



Military Division of the Potomac

Union High Command on July 25 1861 Eastern and Capital Theatre

  • Military Division (Department) of the Potomac: George Brinton McClellan awaited
    • Department of Northeastern Virginia: Irvin McDowell
      • Army of the Potomac: Irvin McDowell
    • Department of Washington: Joseph King Fenno Mansfield
  • Department of Pennsylvania: John Adams Dix
    • Army of the Shenandoah: Robert Patterson
  • Department of the Shenandoah: Nathaniel Prentiss Banks
  • Department of Virginia: Benjamin Franklin Butler

(Established, July 25 1861-August 17 1861, discontinued, to Department of the Potomac)

  • George Brinton McClellan (July 25 1861-August 17 1861)

July 25 1861: The Military Division of the Potomac was established, comprising the Department of Washington and the Department of Northeastern Virginia. Major-General George Brinton McClellan was appointed to command the Military Division of the Potomac, arriving on 27th July 1861.

July 27 1861: Major-General George Brinton McClellan arrived to command the Military Division of the Potomac.

August 17 1861: The Military Division of the Potomac was discontinued.


Department of Washington

Union High Command on July 25 1861 Eastern and Capital Theatre

  • Military Division (Department) of the Potomac: George Brinton McClellan awaited
    • Department of Northeastern Virginia: Irvin McDowell
      • Army of the Potomac: Irvin McDowell
    • Department of Washington: Joseph King Fenno Mansfield
  • Department of Pennsylvania: John Adams Dix
    • Army of the Shenandoah: Robert Patterson
  • Department of the Shenandoah: Nathaniel Prentiss Banks
  • Department of Virginia: Benjamin Franklin Butler

(Transferred to Military Division of the Potomac, July 25 1861-August 17 1861, discontinued, to Department of the Potomac)

  • Joseph King Fenno Mansfield (July 25 1861-August 17 1861)

July 25 1861: The Department of Washington transferred to the Military Division of the Potomac. Prince George’s, Montgomery and Frederick counties of Maryland were transferred from the Department of Pennsylvania to the Department of Washington. Brigadier-General Joseph King Fenno Mansfield retained command of the Department of Washington.

August 17 1861: The Department of Washington was discontinued, and incorporated into the Department of the Potomac.


Department of Northeastern Virginia

Union High Command on July 25 1861 Eastern and Capital Theatre

  • Military Division (Department) of the Potomac: George Brinton McClellan awaited
    • Department of Northeastern Virginia: Irvin McDowell
      • Army of the Potomac: Irvin McDowell
    • Department of Washington: Joseph King Fenno Mansfield
  • Department of Pennsylvania: John Adams Dix
    • Army of the Shenandoah: Robert Patterson
  • Department of the Shenandoah: Nathaniel Prentiss Banks
  • Department of Virginia: Benjamin Franklin Butler

(Transferred to Military Division of the Potomac, July 25 1861-August 17 1861, discontinued, to Department of the Potomac)

  • Irvin McDowell (July 25 1861-August 17 1861)

July 25 1861: The Department of Northeastern Virginia transferred to the Military Division of the Potomac. Brigadier-General Irvin McDowell retained command of the Department of Northeastern Virginia.

August 17 1861: The Department of Northeastern Virginia was discontinued, and incorporated into the Department of the Potomac.

Army of the Potomac

(Established, from Army of Northeastern Virginia, July 25 1861-August 20 1861, transferred to Department of the Potomac)

  • Irvin McDowell (July 25 1861-August 20 1861)

July 25 1861: The Army of Northeastern Virginia was discontinued, and renamed the Army of the Potomac. The Army of the Potomac was established in the Department of Northeastern Virginia. Major-General Irvin McDowell assumed command of the Army of the Potomac.

August 15 1861: The Army of Northeastern Virginia was formally discontinued, having already been re-designated the Army of the Potomac.

August 17 1861: The Army of the Shenandoah was discontinued, and its forces transferred to the Army of the Potomac.

August 20 1861: The Army of the Potomac transferred to the Department of the Potomac.


Department of the Potomac

Union High Command on August 17 1861 Eastern and Capital Theatre

  • Department of the Potomac: George Brinton McClellan awaited
    • Army of the Potomac: Irvin McDowell
  • Department of Virginia: John Ellis Wool

(Established, from Military Division of the Potomac, August 17 1861-April 19 1865, transferred to Military Division of the James)

  • Irvin McDowell (interim August 17 1861-August 19 1861)
  • George Brinton McClellan August 17 1861-November 4 1862 interim November 6 1862
  • Ambrose Everett Burnside (November 5 1862-January 24 1863 interim January 25 1863)
  • Joseph Hooker (January 25 1863-June 26 1863 interim 27 1863)
  • George Gordon Meade (June 27 1863-December 19 1863)
  • John Grubb Parke (temporary December 20 1864-January 10 1865)
  • George Gordon Meade (January 11 1865-April 19 1865)

August 17 1861: The Department of the Potomac was established, comprising the states of Delaware and Maryland, the District of Columbia, the Shenandoah Valley in Virginia and Virginia east of the Allegheny Mountains and north of the James River, except for a 60-mile radius around Fort Monroe. Its territory was taken from the Department of Pennsylvania, the Department of Washington, the Department of the Shenandoah, and the Department of Northeastern Virginia. The Department of Northeastern Virginia was discontinued, and incorporated into the Department of the Potomac. The Department of Pennsylvania was discontinued, and incorporated into the Department of the Potomac. Pennsylvania remained under independent state command. The Department of the Shenandoah was discontinued, and incorporated into the Department of the Potomac. The Department of Washington was discontinued, and incorporated into the Department of the Potomac. Major-General George Brinton McClellan was appointed to command the Department of the Potomac, arriving on 20th August 1861. Major-General Irvin McDowell retained interim command of the Department of the Potomac.

August 20 1861: Major-General George Brinton McClellan arrived to command the Department of the Potomac, succeeding Brigadier-General Irvin McDowell. The Army of the Potomac transferred to the Department of the Potomac.

October 20 1861: The District of Harper’s Ferry and Cumberland was established in the Department of the Potomac, responsible for the railroad from Harper’s Ferry, Virginia, to Cumberland, Maryland, including a strip of land twenty miles wide along the south bank of the Potomac River.

November 9 1861: The territory of Virginia west of the Blue Ridge Mountains transferred to the Department of Western Virginia from the Department of the Potomac.

February 1 1862: The state of New Jersey transferred from the Department of New York to the Department of the Potomac. The state of Pennsylvania was incorporated into the Department of the Potomac.

March 3 1862: The territory west of Flintstone Creek, Maryland, South Branch Mountain, North Shenandoah Mountain, Purgatory Mountain, Blue Ridge Mountain and Allegheny Mountain were transferred from the Department of the Potomac to the Department of Western Virginia.

March 12 1862: The District of Harper’s Ferry and Cumberland was discontinued. The Military District of Washington was established as an independent command under the War Department, comprising the District of Columbia, Alexandria in Virginia and Port Washington.

March 17 1862: Major-General George Brinton McClellan was temporarily suspended as General-in-Chief of the US Army, permitting him to exercise direct field command of the Amy of the Potomac.

March 22 1862: New Jersey, Pennsylvania, Delaware, the Eastern Shore of Maryland and of Virginia, and Cecil, Hartford, Baltimore and Anne Arundel counties of Maryland were transferred from the Department of the Potomac to the Middle Department.

April 4 1862: Virginia east of the Blue Ridge and west of the Fredericksburg & Richmond Railroad, Washington and the District of Columbia and the part of Maryland between the Potomac and Patuxent Rivers, transferred from the Department of the Potomac. The territory of Maryland between the Potomac and Patuxent Rivers, the District of Columbia and Virginia east of the Blue Ridge Mountains and west of the Fredericksburg & Richmond Railroad transferred from the Department of the Potomac to the Department of the Rappahannock. I Corps (Potomac) was discontinued, and its forces incorporated into the Department of the Rappahannock. The Military District of Washington transferred to the Department of the Rappahannock. The parts of Maryland and Virginia west of the Blue Ridge Mountains and east of the Mountain Department transferred from the Department of the Potomac to the Department of the Shenandoah. V Corps (Potomac) was discontinued, and its forces incorporated into the Department of the Shenandoah.

June 1 1862: The parts of Virginia south of the Rappahannock River and east of the Fredericksburg & Richmond Railroad were transferred from the Department of the Potomac to the Department of Virginia. The territory of north-eastern Virginia transferred from the Department of the Potomac to the Department of the Rappahannock.

September 2 1862: The Army of Virginia transferred to the Department of the Potomac.

September 3 1862: IX Corps (Virginia) transferred from the Department of Virginia to the Army of the Potomac.

September 12 1862: The Army of Virginia was discontinued, and its forces incorporated into the Army of the Potomac. III Corps (Virginia) was discontinued, and incorporated into I Corps (Potomac). I Corps (Potomac) was established, comprising the forces of the discontinued III Corps (Army of Virginia). I Corps (Virginia) was discontinued, and incorporated into XI Corps (Potomac). XI Corps was established in the Army of the Potomac, comprising the forces of the discontinued I Corps (Virginia). II Corps (Virginia) was discontinued, and incorporated into XII Corps (Potomac). XII Corps was established in the Army of the Potomac, comprising the forces of the discontinued II Corps (Virginia).

September 19 1862: Western Virginia transferred from the Department of the Potomac to the Department of the Ohio.

November 5 1862: Major-General Ambrose Everett Burnside was appointed to command the Department of the Potomac, arriving on 7th November 1862. Major-General Ambrose Everett Burnside was appointed to command the Army of the Potomac, arriving on 7th November 1862.

November 7 1862: Major-General Ambrose Everett Burnside arrived to command the Department of the Potomac, succeeding Major-General George Brinton McClellan.

January 25 1863: Major-General Joseph Hooker was appointed to command the Department of the Potomac, arriving on 26th January 1863.

January 26 1863: Major-General Joseph Hooker arrived to command the Department of the Potomac, succeeding Major-General Ambrose Everett Burnside.

February 2 1863: The country north of the Potomac River in Maryland from Piscataway Creek to Annapolis Junction, to the mouth of the Monocacy River and south by Goose Creek and the mouth of the Bull Run Mountains to the mouth of the Occoquan Creek, transferred from the Department of the Potomac to the Department of Washington.

June 27 1863: Major-General George Gordon Meade was appointed to command the Department of the Potomac, to succeed Major-General Joseph Hooker, arriving on 28th June 1863.

June 28 1863: Major-General George Gordon Meade arrived to command the Department of the Potomac, succeeding Major-General Joseph Hooker.

August 3 1863: The territory of Maryland west of the Monocacy River and the territory around Harper’s Ferry were transferred from the Middle Department and the Department of the Potomac to the Department of West Virginia.

April 13 1864: IX Corps (Ohio) transferred from the Army of the Ohio to the Department of the Potomac.

May 24 1864: IX Corps (Potomac) was officially transferred from the Department of the Potomac to the Army of the Potomac.

June 21 1864: The part of Maryland between the Potomac and Patuxent Rivers transferred from the Department of the Potomac to the Department of Washington.

December 20 1864: Major-General John Grubb Parke assumed temporary command of the Department of the Potomac, succeeding Major-General George Gordon Meade.

January 11 1865: Major-General George Gordon Meade assumed command of the Department of the Potomac, succeeding Major-General John Grubb Parke.

March 26 1865: Sheridan’s Cavalry Command was established in the Department of the Potomac.

April 19 1865: The Military Division of the James was established to comprise the Department of Virginia and the Department of the Potomac. The Department of the Potomac transferred to the Military Division of the James. The Army of the Potomac transferred with the Department of the Potomac to the Military Division of the James. Sheridan’s Cavalry Command (Potomac) transferred with the Department of the Potomac to the Military Division of the James. Cavalry Corps (Potomac) transferred with Sheridan’s Cavalry Command (Potomac) to the Military Division of the James.

District of Harper’s Ferry and Cumberland

(Established, October 20 1861-March 12 1862, discontinued)

  • Frederick West Lander (October 20 1861-October 21 1861)
  • Benjamin Franklin Kelley (temporary October 22 1861-November 30 1861)
  • Frederick West Lander (December 1 1861-March 1 1862)
  • James Shields (March 2 1862-March 12 1862)

October 20 1861: The District of Harper’s Ferry and Cumberland was established in the Department of the Potomac, responsible for the railroad from Harper’s Ferry, Virginia, to Cumberland, Maryland, including a strip of land twenty miles wide along the south bank of the Potomac River. Brigadier-General Frederick West Lander assumed command of the District of Harper’s Ferry and Cumberland.

October 22 1861: Brigadier-General Benjamin Franklin Kelley assumed temporary command of the District of Harper’s Ferry and Cumberland, succeeding Brigadier-General Frederick West Lander.

December 1 1861: Brigadier-General Frederick West Lander assumed command of the District of Harper’s Ferry and Cumberland, succeeding Brigadier-General Benjamin Franklin Kelley.

March 2 1862: Brigadier-General James Shields assumed temporary command of the District of Harper’s Ferry and Cumberland, succeeding the late Brigadier-General Frederick West Lander.

March 12 1862: The District of Harper’s Ferry and Cumberland was discontinued.

Army of the Potomac

(Transferred from Military Division of the Potomac, August 20 1861-April 19 1865)

  • George Brinton McClellan (August 20 1861-November 4 1862 interim November 6 1862)
  • Ambrose Everett Burnside (November 5 1862-January 25 1863)
  • Joseph Hooker (January 26 1863-June 27 1863)
  • George Gordon Meade (June 28 1863-August 31 1864)
  • John Grubb Parke (temporary September 1 1864-September 9 1864)
  • George Gordon Meade (September 10 1864-December 29 1864)
  • John Grubb Parke (temporary December 30 1864-January 10 1865)
  • George Gordon Meade (January 11 1865-January 23 1865)
  • John Grubb Parke (temporary January 24 1865-February 1 1865)
  • George Gordon Meade (February 2 1865-February 21 1865)
  • John Grubb Parke (temporary February 22 1865-February 27 1865)
  • George Gordon Meade (February 28 1865-April 19 1865)

August 20 1861: The Army of the Potomac transferred from the Military Division of the Potomac to the Department of the Potomac. Major-General George Brinton McClellan assumed command of the Army of the Potomac, succeeding Major-General Irvin McDowell.

March 3 1862: I Corps (Potomac) was established in the Army of the Potomac. II Corps (Potomac) was established in the Army of the Potomac. III Corps (Potomac) was established in the Army of the Potomac. IV Corps (Potomac) was established in the Army of the Potomac. V Corps (Potomac) was established in the Army of the Potomac.

March 17 1862: Major-General George Brinton McClellan was temporarily suspended as General-in-Chief of the US Army, permitting him to exercise direct field command of the Amy of the Potomac.

April 4 1862: I Corps (Potomac) was discontinued, and its forces incorporated into the Department of the Rappahannock. Although the title was officially discontinued, these field forces effectively remained and were later renamed as I Corps (Potomac). V Corps (Potomac) was discontinued, and its forces incorporated into the Department of the Shenandoah.

May 18 1862: Provisional V Corps (Potomac) was established in the Army of the Potomac. Provisional VI Corps (Potomac) was established in the Army of the Potomac.

July 22 1862: V Provisional Corps (Potomac) was confirmed as a permanent organisation as V Corps (Potomac). VI Provisional Corps (Potomac) was confirmed as a permanent organisation as VI Corps (Potomac). IX Corps (Potomac) was established in the Army of the Potomac.

August 3 1862: IX Corps transferred from the Army of the Potomac to the Department of Virginia.

August 16 1862: IV Corps (Potomac) transferred from the Army of the Potomac to the Department of Virginia.

September 3 1862: IX Corps (Virginia) transferred from the Department of Virginia to the Army of the Potomac.

September 12 1862: The Army of Virginia was discontinued, and its forces incorporated into the Army of the Potomac. III Corps (Virginia) was discontinued, and incorporated into I Corps (Potomac). I Corps (Potomac) was established, comprising the discontinued III Corps (Army of Virginia). I Corps (Virginia) was discontinued, and incorporated into XI Corps (Potomac). XI Corps was established in the Army of the Potomac, comprising the discontinued I Corps (Virginia). II Corps (Virginia) was discontinued, and incorporated into XII Corps (Potomac). XII Corps was established in the Army of the Potomac, comprising the discontinued II Corps (Virginia).

November 5 1862: Major-General Ambrose Everett Burnside was appointed to command the Army of the Potomac, arriving on 7th November 1862.

November 7 1862: Major-General Ambrose Everett Burnside arrived to command the Army of the Potomac, succeeding Major-General George Brinton McClellan.

November 14 1862: The Army of the Potomac was reorganised into four Grand Divisions. The Centre Grand Division comprised III Corps (Potomac) and V Corps (Potomac). The Left Grand Division comprised I Corps (Potomac) and VI Corps (Potomac). The Right Grand Division comprised II Corps (Potomac) and IX Corps (Potomac). The Reserve Grand Division comprised XI Corps (Potomac) and XII Corps (Potomac).

January 26 1863: Major-General Joseph Hooker assumed command of the Army of the Potomac, succeeding Major-General Ambrose Everett Burnside.

February 5 1863: The Centre Grand Division of the Army of the Potomac was discontinued. The Right Grand Division of the Army of the Potomac was discontinued. The Left Grand Division of the Army of the Potomac was discontinued. The Reserve Grand Division of the Army of the Potomac was discontinued. IX Corps (Potomac) transferred from the Army of the Potomac to the Department of Virginia.

February 12 1863: Cavalry Corps (Potomac) was established in the Army of the Potomac.

June 28 1863: Major-General George Gordon Meade assumed command of the Army of the Potomac, succeeding Major-General Joseph Hooker.

September 25 1863: XI Corps (Potomac) transferred from the Army of the Potomac to Hooker’s Command (Cumberland). XII Corps (Potomac) transferred from the Army of the Potomac to Hooker’s Command (Cumberland).

March 24 1864: I Corps (Potomac) was discontinued, and its forces allocated to V Corps (Potomac). III Corps (Potomac) was discontinued, and its forces allocated to II Corps (Potomac) and VI Corps (Potomac).

May 24 1864: IX Corps transferred from the Department of the Potomac to the Army of the Potomac.

August 7 1864: VI Corps (Potomac) transferred from the Army of the Potomac to the Army of the Shenandoah.

September 1 1864: Major-General John Grubb Parke assumed temporary command of the Army of the Potomac, succeeding Major-General George Gordon Meade.

September 10 1864: Major-General George Gordon Meade assumed command of the Army of the Potomac, succeeding Major-General John Grubb Parke.

December 6 1864: December 6 1864: VI Corps (Shenandoah) transferred from the Army of the Shenandoah to the Army of the Potomac.

December 30 1864: Major-General John Grubb Parke assumed temporary command of the Army of the Potomac, succeeding Major-General George Gordon Meade.

January 11 1865: Major-General George Gordon Meade assumed command of the Army of the Potomac, succeeding Major-General John Grubb Parke.

January 24 1865: Major-General John Grubb Parke assumed temporary command of the Army of the Potomac, succeeding Major-General George Gordon Meade.

February 2 1865: Major-General George Gordon Meade assumed command of the Army of the Potomac, succeeding Major-General John Grubb Parke.

February 22 1865: Major-General John Grubb Parke assumed temporary command of the Army of the Potomac, succeeding Major-General George Gordon Meade.

February 28 1865: Major-General George Gordon Meade assumed command of the Army of the Potomac, succeeding Major-General John Grubb Parke.

March 26 1865: Sheridan’s Cavalry Command was established in the Department of the Potomac. It comprised the combined cavalry forces of the Army of the Potomac, the Army of the James and the Army of the Shenandoah.

March 26 1865: Cavalry Corps (Potomac) transferred from the Army of the Potomac to Sheridan’s Cavalry Command (Potomac).

April 19 1865: The Army of the Potomac transferred with the Department of the Potomac to the Military Division of the James. II Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James. V Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James. VI Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James. IX Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James. Cavalry Corps (Potomac) transferred with Sheridan’s Cavalry Command (Potomac) to the Military Division of the James.

I Corps Potomac

(Established, March 3 1862-April 4 1862, discontinued, to Department of the Rappahannock)

  • Irvin McDowell (March 3 1862-April 4 1862)

March 3 1862: I Corps (Potomac) was established in the Army of the Potomac. Brigadier-General Irvin McDowell assumed command of I Corps (Potomac).

April 4 1862: I Corps (Potomac) was discontinued, and its forces incorporated into the Department of the Rappahannock. Although the title was officially discontinued, these field forces effectively remained and were later renamed as I Corps (Potomac)

II Corps Potomac

(Established, March 3 1862-November 14 1862, transferred to Right Grand Division Potomac)

  • Edwin Vose Sumner (March 3 1862-October 6 1862)
  • Darius Nash Couch (October 7 1862-November 14 1862)

March 3 1862: II Corps (Potomac) was established in the Army of the Potomac. Brigadier-General Edwin Vose Sumner assumed command of II Corps (Potomac).

October 7 1862: Major-General Darius Nash Couch assumed command of II Corps (Potomac), succeeding Major-General Edwin Vose Sumner.

November 14 1862: II Corps (Potomac) transferred to the Right Grand Division of the Army of the Potomac.

III Corps Potomac

(Established, March 3 1862-November 14 1862, transferred to Centre Grand Division Potomac)

  • Samuel Peter Heintzelman (March 3 1862-October 19 1862)
  • George Stoneman (October 20 1862-November 14 1862)

March 3 1862: III Corps (Potomac) was established in the Army of the Potomac. Brigadier-General Samuel Peter Heintzelman assumed command of III Corps (Potomac).

October 20 1862: Brigadier-General George Stoneman assumed command of III Corps (Potomac), succeeding Major-General Samuel Peter Heintzelman.

November 14 1862: III Corps (Potomac) transferred to the Centre Grand Division of the Army of the Potomac.

IV Corps Potomac

(Established, March 3 1862-August 16 1862, transferred to Department of Virginia)

  • Erasmus Darwin Keyes (March 3 1862-August 16 1862)

March 3 1862: IV Corps (Potomac) was established in the Army of the Potomac. Brigadier-General Erasmus Darwin Keyes assumed command of IV Corps (Potomac).

August 16 1862: IV Corps (Potomac) transferred from the Army of the Potomac to the Department of Virginia.

V Corps Potomac

(Established, March 3 1862-April 4 1862, discontinued, to Department of the Shenandoah)

  • Nathaniel Prentiss Banks (March 3 1862-April 4 1862)

March 3 1862: V Corps (Potomac) was established in the Army of the Potomac. Major-General Nathaniel Prentiss Banks assumed command of V Corps (Potomac).

April 4 1862: V Corps (Potomac) was discontinued, and its forces incorporated into the Department of the Shenandoah.

V Provisional Corps Potomac

(Established, May 18 1862-July 22 1862, to V Corps Potomac)

  • Fitz-John Porter (May 18 1862-July 22 1862)

May 1862: Provisional V Corps (Potomac) was established in the Army of the Potomac. Brigadier-General Fitz-John Porter assumed command of V Corps (Potomac).

July 22 1862: V Provisional Corps (Potomac) was confirmed as V Corps (Potomac).

VI Provisional Corps Potomac

(Established, May 18 1862-July 22 1862, to VI Corps Potomac)

  • William Buel Franklin (May 18 1862-July 22 1862)

May 18 1862: Provisional VI Corps (Potomac) was established in the Army of the Potomac. Brigadier-General William Buel Franklin assumed command of VI Corps (Potomac).

July 22 1862: VI Provisional Corps (Potomac) was confirmed as VI Corps (Potomac).

V Corps Potomac

(Established, from V Provisional Corps Potomac, July 22 1862-November 14 1862, transferred to Centre Grand Division Potomac)

  • Fitz-John Porter (July 22 1862-November 9 1862)
  • Joseph Hooker (November 10 1862-November 14 1862)

July 22 1862: V Provisional Corps (Potomac) was confirmed as V Corps (Potomac). Major-General Fitz-John Porter retained command V Corps (Potomac).

November 10 1862: Major-General Joseph Hooker assumed command of V Corps (Potomac, succeeding Major-General Fitz John Porter.

November 14 1862: V Corps (Potomac) transferred to the Centre Grand Division of the Army of the Potomac.

VI Corps Potomac

(Established, from VI Provisional Corps Potomac, July 22 182-November 14 1862, transferred to Left Grand Division Potomac)

  • William Buel Franklin (July 22 182-November 14 1862)

July 22 1862: VI Provisional Corps (Potomac) was confirmed as VI Corps (Potomac). Major-General William Buel Franklin retained command of VI Corps (Potomac).

November 14 1862: VI Corps (Potomac) transferred to the Left Grand Division of the Army of the Potomac.

IX Corps Potomac

(Established, July 22 1862-August 3 1862, transferred to Department of Virginia)

  • Ambrose Everett Burnside (July 22 1862-August 3 1862)

July 22 1862: IX Corps (Potomac) was established in the Army of the Potomac, comprising forces from the Department of the South that had participated in the Expedition to North Carolina. Major-General Ambrose Everett Burnside assumed command of IX Corps (Potomac).

August 3 1862: IX Corps transferred from the Army of the Potomac to the Department of Virginia.

Army of Virginia

(Transferred from War Department, September 2 1862-September 12 1862, discontinued to Army of the Potomac)

  • George Brinton McClellan (September 2 1862-September 12 1862)

September 2 1862: The Army of Virginia transferred to the Department of the Potomac. I Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac. II Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac. III Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac. Major-General George Brinton McClellan assumed command of the Army of Virginia, succeeding Major-General John Pope.

September 12 1862: The Army of Virginia was discontinued, and its forces incorporated into the Army of the Potomac. III Corps (Virginia) was discontinued, and incorporated into I Corps (Potomac). I Corps (Potomac) was established, comprising the forces of the discontinued III Corps (Army of Virginia). I Corps (Virginia) was discontinued, and incorporated into XI Corps (Potomac). XI Corps was established in the Army of the Potomac, comprising the forces of the discontinued I Corps (Virginia). II Corps (Virginia) was discontinued, and incorporated into XII Corps (Potomac). XII Corps was established in the Army of the Potomac, comprising the forces of the discontinued II Corps (Virginia).

I Corps Virginia

(Transferred, from War Department, September 2 1862 September 12 1862, discontinued, to XI Corps Potomac)

  • Franz Sigel (September 2 1862 September 12 1862)

September 2 1862: I Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac. Major-General Franz Sigel retained command of I Corps (Virginia).

September 12 1862: I Corps (Virginia) was discontinued, and incorporated into XI Corps (Potomac).

II Corps Virginia

(Transferred from War Department, September 2 1862 September 12 1862, discontinued, to XII Corps Potomac)

  • Nathaniel Prentiss Banks (September 2 1862-September 3 1862)
  • Alpheus Starkey Williams (Temporary September 4 1862-September 12 1862)

September 2 1862: II Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac. Major-General Nathaniel Prentiss Banks retained command of II Corps (Virginia).

September 4 1862: Brigadier-General Alpheus Starkey Williams assumed temporary command of II Corps (Virginia), succeeding Major-General Nathaniel Prentiss Banks.

September 12 1862: II Corps (Virginia) was discontinued, and incorporated into XII Corps (Potomac).

III Corps Virginia

(Transferred from War Department, September 2 1862-September 12 1862, discontinued, to I Corps Potomac)

  • Irvin McDowell (September 2 1862-September 4 1862)
  • James Brewerton Ricketts (temporary September 5 1862)
  • Joseph Hooker (September 6 1862-September 12 1862)

September 2 1862: III Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac. Major-General Irvin McDowell retained command of I Corps (Virginia).

September 5 1862: Brigadier-General James Brewerton Ricketts assumed temporary command of III Corps (Virginia), succeeding Major-General Irvin McDowell.

September 6 1862: Major-General Joseph Hooker assumed command of III Corps (Virginia), succeeding Brigadier-General James Brewerton Ricketts.

September 12 1862: III Corps (Virginia) was discontinued, and incorporated into I Corps (Potomac).

IX Corps Potomac

(Transferred from Department of Virginia, September 3 1862-November 14 1862, transferred to Right Grand Division Potomac)

  • Jesse Lee Reno (September 3 1862-September 13 1862)
  • Jacob Dolson Cox (temporary September 14 1862-October 7 1862)
  • Orlando Bolivar Willcox (October 8 1862-November 14 1862)

September 3 1862: IX Corps (Virginia) transferred from the Department of Virginia to the Army of the Potomac. Major-General Jesse Lee Reno assumed command of IX Corps (Potomac), succeeding Major-General Ambrose Everett Burnside.

September 14 1862: Brigadier-General Jacob Dolson Cox assumed temporary command of IX Corps (Potomac), succeeding Major-General Jesse Lee Reno.

October 8 1862: Brigadier-General Orlando Bolivar Willcox assumed temporary command of IX Corps (Potomac), succeeding Major-General Jacob Dolson Cox.

November 14 1862: IX Corps (Potomac) transferred to the Right Grand Division of the Army of the Potomac.

I Corps Potomac

(Established, from III Corps Virginia, September 12 1862-November 14 1862, transferred to Left Grand Division Potomac)

  • Joseph Hooker (September 12 1862-September 17 1862)
  • George Gordon Meade (temporary September 17 1862-September 28 1862)
  • John Fulton Reynolds (September 29 1862-November 14 1862)

September 12 1862: I Corps (Potomac) was established, comprising the forces of the discontinued III Corps (Army of Virginia). Major-General Joseph Hooker assumed command of I Corps (Potomac).

September 17 1862: Major-General George Gordon Meade assumed temporary command of I Corps (Potomac), succeeding Major-General Joseph Hooker.

September 29 1862: Brigadier-General John Fulton Reynolds assumed command of I Corps (Potomac), succeeding Major-General George Gordon Meade.

November 14 1862: I Corps (Potomac) transferred to the Left Grand Division of the Army of the Potomac.

XI Corps Potomac

(Established, from I Corps Virginia, September 12 1862-November 14 1862, transferred to Reserve Grand Division Potomac)

  • Franz Sigel (September 12 1862-November 14 1862)

September 12 1862: XI Corps was established in the Army of the Potomac, comprising the forces of the discontinued I Corps (Virginia). Major-General Franz Sigel assumed command of XI Corps (Potomac).

November 14 1862: XI Corps (Potomac) transferred to the Reserve Grand Division of the Army of the Potomac.

XII Corps Potomac

(Established, from II Corps Virginia, September 12 1862-November 14 1862, transferred to Reserve Grand Division Potomac)

  • Alpheus Starkey Williams (temporary September 12 1862-September 14 1862)
  • Joseph King Fenno Mansfield (September 15 1862-September 17 1862)
  • Alpheus Starkey Williams (temporary September 17 1862-October 19 1862)
  • Henry Warner Slocum (October 20 1862-November 14 1862)

September 12 1862: XII Corps was established in the Army of the Potomac, comprising the forces of the discontinued II Corps (Virginia). Brigadier-General Alpheus Starkey Williams assumed temporary command of XII Corps (Potomac).

September 15 1862: Major-General Joseph King Fenno Mansfield assumed command of XII Corps (Potomac), succeeding Brigadier-General Alpheus Starkey Williams.

September 17 1862: Brigadier-General Alpheus Starkey Williams assumed temporary command of XII Corps (Potomac), succeeding Major-General Joseph King Fenno Mansfield.

October 20 1862: Major-General Henry Warner Slocum assumed command of XII Corps (Potomac), succeeding Brigadier-General Alpheus Starkey Williams.

November 14 1862: XII Corps (Potomac) transferred to the Reserve Grand Division of the Army of the Potomac.

Right Grand Division Potomac

(Established, November 14 1862-February 5 1863, discontinued)

  • Edwin Vose Sumner (November 14 1862-January 24 1863)
  • Darius Nash Couch (January 25 1863-February 5 1863)

November 14 1862: The Right Grand Division was established in the Army of the Potomac. Major-General Edwin Vose Sumner assumed command of the Right Grand Division of the Army of the Potomac. II Corps (Potomac) transferred to the Right Grand Division of the Army of the Potomac. IX Corps (Potomac) transferred to the Right Grand Division of the Army of the Potomac.

January 25 1863: Major-General Darius Nash Couch assumed command of the Right Grand Division of the Army of the Potomac, succeeding Major-General Edward Vose Sumner.

February 5 1863: The Right Grand Division of the Army of the Potomac was discontinued. II Corps (Potomac) transferred to the Army of the Potomac. IX Corps Potomac transferred to the Department of Virginia.

II Corps Potomac

(Transferred from Army of the Potomac, November 14 1862-February 5 1863, Transferred to Army of the Potomac)

  • Darius Nash Couch (November 14 1862-December 25 1862)
  • John Sedgwick (December 26 1862-January 25 1863)
  • Oliver Otis Howard (temporary January 26 1863-February 2 1863)
  • Darius Nash Couch (February 3 1863-February 5 1863)

November 14 1862: II Corps (Potomac) transferred to the Right Grand Division of the Army of the Potomac. Major-General Darius Nash Couch retained command of II Corps (Potomac).

December 26 1862: Major-General John Sedgwick assumed command of II Corps (Potomac), succeeding Major-General Darius Nash Couch.

January 26 1863: Major-General Oliver Otis Howard assumed temporary command of II Corps (Potomac), succeeding Major-General John Sedgwick.

February 3 1863: Major-General Darius Nash Couch assumed command of II Corps (Potomac), succeeding Major-General Oliver Otis Howard.

February 5 1863: The Right Grand Division of the Army of the Potomac was discontinued. II Corps (Potomac) transferred to the Army of the Potomac.

IX Corps Potomac

(Transferred from Army of the Potomac November 14 1862-February 5 1863, transferred to Department of Virginia)

  • Orlando Bolivar Willcox (November 14 1862-January 15 1863)
  • John Sedgwick (January 16 1863-February 5 1863)

November 14 1862: IX Corps (Potomac) transferred to the Right Grand Division of the Army of the Potomac. Brigadier-General Orlando Bolivar Willcox retained command of IX Corps (Potomac).

January 16 1863: Major-General John Sedgwick assumed command of IX Corps (Potomac), succeeding Brigadier-General Orlando Bolivar Willcox.

February 5 1863: The Right Grand Division of the Army of the Potomac was discontinued. IX Corps Potomac transferred to the Department of Virginia.

Left Grand Division Potomac

(Established, November 14 1862-February 5 1863, discontinued)

  • William Buel Franklin (November 14 1862-January 24 1863)
  • William Farrar Smith (January 25 1863-February 5 1863)

November 14 1862: The Left Grand Division was established in the Army of the Potomac. Major-General William Buel Franklin assumed command of the Left Grand Division of the Army of the Potomac. I Corps (Potomac) transferred to the Left Grand Division of the Army of the Potomac. VI Corps (Potomac) transferred to the Left Grand Division of the Army of the Potomac.

January 25 1863: Major-General William Farrar Smith assumed command of the Left Grand Division of the Army of the Potomac, succeeding Major-General William Buel Franklin.

February 5 1863: The Left Grand Division of the Army of the Potomac was discontinued. I Corps (Potomac) transferred to the Army of the Potomac. VI Corps Potomac transferred to the Army of the Potomac.

I Corps Potomac

(Transferred from Army of the Potomac, November 14 1862-February 5 1863, transferred to Army of the Potomac)

  • John Fulton Reynolds (November 14 1862-January 1 1863)
  • James Samuel Wadsworth (temporary January 2 1863-January 3 1863)
  • John Fulton Reynolds (January 4 1863-February 5 1863)

November 14 1862: I Corps (Potomac) transferred to the Left Grand Division of the Army of the Potomac. Major-General John Fulton Reynolds retained command of I Corps (Potomac).

January 2 1863: Brigadier-General James Samuel Wadsworth assumed temporary command of I Corps (Potomac), succeeding Major-General John Fulton Reynolds.

January 4 1863: Major-General John Fulton Reynolds assumed command of I Corps (Potomac), succeeding Brigadier-General James Samuel Wadsworth.

February 5 1863: The Left Grand Division of the Army of the Potomac was discontinued. I Corps (Potomac) transferred to the Army of the Potomac.

VI Corps Potomac

(Transferred from Army of the Potomac, November 14 1862-February 5 1863, transferred to Army of the Potomac)

  • William Buel Franklin (November 14 1862-November 15 1862)
  • William Farrar Smith (November 16 1862-January 24 1863)
  • John Newton (January 2 1863-February 3 1863)
  • John Sedgwick (February 4 1864-February 5 1863)

November 14 1862: VI Corps (Potomac) transferred to the Left Grand Division of the Army of the Potomac. Major-General William Buel Franklin retained command of VI Corps (Potomac).

November 16 1862: Major-General William Farrar Smith assumed command of VI Corps (Potomac), succeeding Major-nd Division of the Army of the Potomac was discontinued. VI Corps Potomac transferred to the Army of the Potomac.

Centre Grand Division Potomac

(Established, November 14 1862-February 5 1863, discontinued)

  • Joseph Hooker (November 14 1862-January 24 1863)
  • George Gordon Meade (January 25 1863)

November 14 1862: The Centre Grand Division was established in the Army of the Potomac. Major-General Joseph Hooker assumed command of the Centre Grand Division of the Army of the Potomac. III Corps (Potomac) transferred to the Centre Grand Division of the Army of the Potomac. V Corps (Potomac) transferred to the Centre Grand Division of the Army of the Potomac.

January 25 1863: Major-General George Gordon Meade assumed command of the Centre Grand Division of the Army of the Potomac, succeeding Major-General Joseph Hooker.

February 5 1863: The Centre Grand Division of the Army of the Potomac was discontinued. III Corps (Potomac) transferred to the Army of the Potomac. V Corps Potomac transferred to the Army of the Potomac.

III Corps Potomac

(Transferred from Army of the Potomac, November 14 1862-February 5 1863, transferred to Army of the Potomac)

  • George Stoneman (November 14 1862-February 5 1863)

November 14 1862: III Corps (Potomac) transferred to the Centre Grand Division of the Army of the Potomac. Major-General George Stoneman retained command of III Corps (Potomac).

February 5 1863: The Centre Grand Division of the Army of the Potomac was discontinued. III Corps (Potomac) transferred to the Army of the Potomac.

V Corps Potomac

(Transferred from Army of the Potomac, November 14 1862-February 5 1863, transferred to Army of the Potomac)

  • Joseph Hooker (November 14 1862-November 15 1862)
  • Daniel Butterfield (November 16 1862-December 23 1862)
  • George Gordon Meade (December 24 1862-January 25 1863)
  • Charles Griffin temporary January 26 1863-January 31 1863)
  • George Sykes (February 1 1863-February 5 1863)

November 14 1862: V Corps (Potomac) transferred to the Centre Grand Division of the Army of the Potomac. Major-General Joseph Hooker retained command of V Corps (Potomac).

November 16 1862: Brigadier-General Daniel Butterfield assumed command of V Corps (Potomac), succeeding Major-General Joseph Hooker.

December 24 1862: Major-General George Gordon Meade assumed command of V Corps (Potomac), succeeding Major-General Daniel Butterfield.

January 26 1863: Brigadier-General Charles Griffin assumed temporary command of V Corps (Potomac), succeeding Major-General George Gordon Meade.

February 1 1863: Major-General George Sykes assumed temporary command of V Corps (Army of the Potomac), succeeding Brigadier-General Charles Griffin.

February 5 1863: The Centre Grand Division of the Army of the Potomac was discontinued. V Corps Potomac transferred to the Army of the Potomac.

Reserve Grand Division Potomac

(Established, November 14 1862-February 5 1863, discontinued)

  • Franz Sigel (November 14 1862-February 5 1863)

November 14 1862: The Reserve Grand Division was established in the Army of the Potomac. Major-General Franz Sigel assumed command of the Reserve Grand Division of the Army of the Potomac. XI Corps (Potomac) transferred to the Reserve Grand Division of the Army of the Potomac. XII Corps (Potomac) transferred to the Reserve Grand Division of the Army of the Potomac.

February 5 1863: The Reserve Grand Division of the Army of the Potomac was discontinued. XI Corps (Potomac) transferred to the Army of the Potomac. XII Corps Potomac transferred to the Army of the Potomac.

XI Corps Potomac

(Transferred from Army of the Potomac, November 14 1862-February 5 1863, transferred to Army of the Potomac)

  • Franz Sigel (November 14 1862-January 9 1863)
  • Julius Stahel (temporary January 10 1863-January 18 1863)
  • Carl Schurz (temporary January 19 1863-February 5 1863)

November 14 1862: XI Corps (Potomac) transferred to the Reserve Grand Division of the Army of the Potomac. Major-General Franz Sigel retained command of XI Corps (Potomac).

January 10 1863: Brigadier-General Julius Stahel assumed temporary command of XI Corps (Potomac), succeeding Major-General Franz Sigel.

January 19 1863: Major-General Carl Schurz assumed temporary command of XI Corps (Potomac), succeeding Brigadier-General Julius Stahel

February 5 1863: The Reserve Grand Division of the Army of the Potomac was discontinued. XI Corps (Potomac) transferred to the Army of the Potomac.

XII Corps Potomac

(Transferred from Army of the Potomac, November 14 1862-February 5 1863, transferred to Army of the Potomac)

  • Henry Warner Slocum (November 14 1862-February 5 1863)

November 14 1862: XII Corps (Potomac) transferred to the Reserve Grand Division of the Army of the Potomac. Major-General Henry Warner Slocum retained command of XIII Corps (Potomac).

February 5 1863: The Reserve Grand Division of the Army of the Potomac was discontinued. XII Corps Potomac transferred to the Army of the Potomac.

I Corps Potomac

(Transferred from Left Grand Division, February 5 1863-March 24 1864, discontinued, to V Corps (Potomac))

  • John Fulton Reynolds February 5 1863-February 28 1863)
  • James Samuel Wadsworth (temporary March 1 1863-March 8 1863)
  • John Fulton Reynolds (March 9 1863-July 1 1863)
  • Abner Doubleday (July 1 1863-July 2 1863)
  • John Newton (July 2 1863-March 10 1864)
  • James Samuel Wadsworth (temporary March 11 1864-March 14 1864)
  • John Newton (March 14 186-March 24 1864)

February 5 1863: I Corps (Potomac) transferred from the Left Grand Division (Potomac) to the Army of the Potomac. Major-General John Fulton Reynolds retained command of I Corps (Potomac).

March 1 1863: Brigadier-General James Samuel Wadsworth assumed temporary command of I Corps (Potomac), succeeding Major-General John Fulton Reynolds.

March 9 1863: Major-General John Fulton Reynolds assumed command of I Corps (Potomac), succeeding Brigadier-General James Samuel Wadsworth.

July 1 1863: Major-General Abner Doubleday assumed temporary command of I Corps (Potomac), succeeding Major-General John Fulton Reynolds.

July 2 1863: Major-General John Newton assumed command of I Corps (Potomac), succeeding Major-General Abner Doubleday.

March 11 1864: Brigadier-General James Samuel Wadsworth assumed temporary command of I Corps (Potomac), succeeding Brigadier-General John Newton.

March 14 1864: Major-General John Newton assumed command of I Corps (Potomac), succeeding Brigadier-General James Samuel Wadsworth.

March 24 1864: I Corps (Potomac) was discontinued, and its forces allocated to V Corps (Potomac).

II Corps Potomac

(Transferred from Right Grand Division, February 5 1863-April 19 1865, transferred to Military Division of the James)

  • Darius Nash Couch (February 5 1863-May 22 1863)
  • Winfield Scott Hancock (May 22 1863-July 1 1863)
  • John Gibbon (temporary July 1 1863-July 2 1863)
  • Winfield Scott Hancock (July 2 1863-July 3 1863)
  • William Hays (temporary July 3 1863-August 16 1863)
  • Gouverneur Kemble Warren (August 16 1863-August 26 1863)
  • John Curtis Caldwell (temporary August 26 1863-September 2 1863)
  • Gouverneur Kemble Warren (September 2 1863-October 10 1863)
  • John Curtis Caldwell (temporary October 10 1863-October 12 1863)
  • Gouverneur Kemble Warren (October 12 1863-December 16 1863)
  • John Curtis Caldwell (temporary December 16 1863-December 29 1863)
  • Gouverneur Kemble Warren (December 29 1863-January 9 1864)
  • John Curtis Caldwell (temporary January 9 1864-January 13 1864)
  • Gouverneur Kemble Warren (January 13 1864-March 24 1864)
  • Winfield Scott Hancock (March 24 1864-June 18 1864)
  • David Bell Birney (temporary June 18 1864-June 27 1864)
  • Winfield Scott Hancock (June 27 1864-November 26 1864)
  • Andrew Atkinson Humphreys (November 26 1864-February 15 1865)
  • Gershom Mott (temporary February 15 1865-February 17 1865)
  • Nelson Appleton Miles (temporary February 17 1865-February 25 1865)
  • Andrew Atkinson Humphreys (February 25 1865-April 19 1865)
  • Francis Channing Barlow (temporary April 19 1865-April 19 1865)

February 5 1863: The Right Grand Division of the Army of the Potomac was discontinued. II Corps (Potomac) transferred to the Army of the Potomac. Major-General Darius Nash Couch retained command of II Corps (Potomac).

May 22 1863: Major-General Winfield Scott Hancock assumed command of II Corps (Potomac), succeeding Major-General Darius Nash Couch.

July 1 1863: Brigadier-General John Gibbon assumed temporary command of II Corps (Potomac), succeeding Major-General Winfield Scott Hancock.

July 2 1863: Major-General Winfield Scott Hancock assumed command of II Corps (Potomac), succeeding Brigadier-General John Gibbon.

July 3 1863: Brigadier-General William Hays assumed temporary command of II Corps (Potomac), succeeding Major-General Winfield Scott Hancock.

August 16 1863: Major-General Gouverneur Kemble Warren assumed command of II Corps (Potomac), succeeding Brigadier-General William Hays.

August 26 1863: Brigadier-General John Curtis Caldwell assumed temporary command of II Corps (Potomac), succeeding Major-General Gouverneur Kemble Warren.

September 2 1863: Major-General Gouverneur Kemble Warren assumed command of II Corps (Potomac), succeeding Brigadier-General John Curtis Caldwell.

October 10 1863: Brigadier-General John Curtis Caldwell assumed temporary command of II Corps (Potomac), succeeding Major-General Gouverneur Kemble Warren.

October 12 1863: Major-General Gouverneur Kemble Warren assumed command of II Corps (Potomac), succeeding Brigadier-General John Curtis Caldwell.

December 16 1863: Brigadier-General John Curtis Caldwell assumed temporary command of II Corps (Potomac), succeeding Major-General Gouverneur Kemble Warren.

December 29 1863: Major-General Gouverneur Kemble Warren assumed command of II Corps (Potomac), succeeding Brigadier-General John Curtis Caldwell.

January 9 1864: Brigadier-General John Curtis Caldwell assumed temporary command of II Corps (Potomac), succeeding Major-General Gouverneur Kemble Warren.

January 13 1864: Major-General Gouverneur Kemble Warren assumed command of II Corps (Potomac), succeeding Brigadier-General John Curtis Caldwell.

March 24 1864: III Corps (Potomac) was discontinued, and its forces allocated to II Corps (Potomac) and VI Corps (Potomac). Major-General Winfield Scott Hancock assumed command of II Corps (Potomac), succeeding Major-General Gouverneur Kemble Warren.

June 18 1864: Brigadier-General David Bell Birney assumed temporary command of II Corps (Potomac), succeeding Major-General Winfield Scott Hancock.

June 27 1864: Major-General Winfield Scott Hancock assumed command of II Corps (Potomac), succeeding Major-General David Bell Birney.

November 26 1864: Major-General Andrew Atkinson Humphreys assumed command of II Corps (Potomac), succeeding Major-General Winfield Scott Hancock.

February 15 1865: Major-General Gershom Mott assumed temporary command of II Corps (Potomac), succeeding Brigadier-General Andrew Atkinson Humphreys.

February 17 1865: Brigadier-General Nelson Appleton Miles assumed temporary command of II Corps (Potomac), succeeding Brigadier-General Gershom Mott.

February 25 1865: Major-General Andrew Atkinson Humphreys assumed command of II Corps (Potomac), succeeding Brigadier-General Nelson Appleton Miles.

April 19 1865: Brigadier-General Francis Channing Barlow assumed temporary command of II Corps (Potomac), succeeding Major-General Andrew Atkinson Humphreys.

April 19 1865: II Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James.

III Corps Potomac

(Transferred from Centre Grand Division, February 5 1863-March 24 1864, discontinued, to II Corps (Potomac) and VI Corps (Potomac)

  • Daniel Edgar Sickles (February 5 1863-May 29 1863)
  • David Bell Birney (temporary May 29 1863-June 3 1863)
  • Daniel Edgar Sickles (June 3 1863-July 2 1863)
  • David Bell Birney (temporary July 2 1863-July 7 1863),
  • William Henry French (July 7 1863-January 28 1864)
  • David Bell Birney (temporary January 28 1864-February 17 1864)
  • William Henry French (February 17 1864-March 24 1864)

February 5 1863: III Corps (Potomac) transferred from the Centre Grand Division (Potomac) to the Army of the Potomac. Major-General Daniel Edgar Sickles assumed command of III Corps (Potomac).

May 29 1863: Major-General David Bell Birney assumed temporary command of III Corps (Potomac), succeeding Major-General Daniel Edgar Sickles.

June 3 1863: Major-General Daniel Edgar Sickles assumed command of III Corps (Potomac), succeeding Major-General David Bell Birney.

July 2 1863: Brigadier-General David Bell Birney assumed temporary command of III Corps (Potomac), succeeding Major-General Daniel Edgar Sickles.

July 7 1863: Major-General William Henry French assumed command of III Corps (Potomac), succeeding Major-General David Bell Birney.

January 28 1864: Brigadier-General David Bell Birney assumed temporary command of III Corps (Potomac), succeeding Major-General William Henry French.

February 17 1864: Major-General William Henry French assumed command of III Corps (Potomac), succeeding Major-General David Bell Birney.

March 24 1864: III Corps (Potomac) was discontinued, and its forces allocated to II Corps (Potomac) and VI Corps (Potomac).

V Corps Potomac

(Transferred from Centre Grand Division, February 5 1863-April 19 1865, transferred to Military Division of the James)

  • George Gordon Meade (February 5 1863-February 16 1863)
  • George Sykes (temporary February 16 1863-February 23 1863)
  • Andrew Atkinson Humphreys (temporary February 23 1863-February 28 1863)
  • George Gordon Meade (February 28 1863-June 28 1863)
  • George Sykes (June 28 1863-October 7 1863)
  • Samuel Wylie Crawford (temporary October 7 1863-October 15 1863)
  • George Sykes (October 15 1863-March 24 1864)
  • Gouverneur Kemble Warren (March 24 1864-January 2 1865)
  • Samuel Wylie Crawford (temporary January 2 1865-January 27 1865)
  • Gouverneur Kemble Warren (January 27 1865-April 1 1865)
  • Charles Griffin (temporary April 1 1865-April 19 1865)

February 5 1863: V Corps Potomac transferred from the Centre Grand Division (Potomac) to the Army of the Potomac. Major-General George Gordon Meade assumed command of V Corps (Potomac), succeeding Major-General George Sykes.

February 16 1863: Major-General George Sykes assumed temporary command of V Corps (Potomac), succeeding Major-General George Gordon Meade

February 23 1863: Brigadier-General Andrew Atkinson Humphreys assumed temporary command of V Corps (Potomac), succeeding Major-General George Sykes.

February 28 1863: Major-General George Gordon Meade assumed command of V Corps (Potomac), succeeding Brigadier-General Andrew Atkinson Humphreys.

June 28 1863: Major-General George Sykes assumed command of V Corps (Potomac), succeeding Major-General George Gordon Meade.

October 7 1863: Brigadier-General Samuel Wylie Crawford assumed temporary command of V Corps (Potomac), succeeding Major-General George Sykes.

October 15 1863: Major-General George Sykes assumed command of V Corps (Potomac), succeeding Brigadier-General Samuel Wylie Crawford.

March 24 1864: I Corps (Potomac) was discontinued, and its forces allocated to V Corps (Potomac). Major-General Gouverneur Kemble Warren assumed command of V Corps (Potomac), succeeding Major-General George Sykes.

January 2 1865: Brigadier-General Samuel Wylie Crawford assumed temporary command of V Corps (Potomac), succeeding Major-General Gouverneur Kemble Warren.

January 27 1865: Major-General Gouverneur Kemble Warren assumed command of V Corps (Potomac), succeeding Brigadier-General Samuel Wylie Crawford.

April 1 1865: Brigadier-General Charles Griffin assumed command of V Corps (Potomac), succeeding Major-General Gouverneur Kemble Warren.

April 19 1865: V Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James.

VI Corps Potomac

(Transferred from Left Grand Division, February 5 1863-August 7 1864, transferred to Army of the Shenandoah)

  • John Sedgwick (February 5 1863-April 6 1864)
  • James Brewerton Ricketts (temporary April 6 1864-April 13 1864)
  • John Sedgwick (April 13 1864-May 9 1864)
  • Horatio Gouverneur Wright (May 9 1864-August 7 1864)

February 5 1863: VI Corps Potomac transferred from Left Grand Division Potomac to the Army of the Potomac. Major-General John Sedgwick retained command of VI Corps (Potomac).

March 24 1864: III Corps (Potomac) was discontinued, and its forces allocated to II Corps (Potomac) and VI Corps (Potomac).

April 6 1864: Brigadier-General James Brewerton Ricketts assumed temporary command of VI Corps (Potomac), succeeding Major-General John Sedgwick.

April 13 1864: Major-General John Sedgwick assumed command of VI Corps (Potomac), succeeding Brigadier-General James Brewerton Ricketts.

May 9 1864: Brigadier-General Horatio Gouverneur Wright assumed command of VI Corps (Potomac), succeeding Major-General John Sedgwick.

August 7 1864: VI Corps (Potomac) transferred from the Army of the Potomac to the Army of the Shenandoah.

XI Corps Potomac

(Transferred from Reserve Grand Division, February 5 1863-September 25 1863, transferred to Hooker’s Command Cumberland)

  • Franz Sigel (February 5 1863-February 22 1863)
  • Adolph Wilhelm August Frederick von Steinwehr (temporary February 22 1863-March 5 1863)
  • Carl Schurz (temporary March 5 1863-April 2 1863)
  • Oliver Otis Howard (April 2 1863-July 1 1863)
  • Carl Schurz (temporary July 1 1863)
  • Oliver Otis Howard (July 1 1863-September 25 1863)

February 5 1863: XI Corps (Potomac) transferred from the Reserve Grand Division (Potomac) to the Army of the Potomac. Major-General Franz Sigel assumed command of XI Corps (Potomac), succeeding Major-General Carl Schurz.

February 22 1863: Brigadier-General Adolph Wilhelm August Frederick von Steinwehr assumed temporary command of XI Corps (Potomac), succeeding Major-General Franz Sigel.

March 5 1863: Brigadier-General Carl Schurz assumed temporary command of XI Corps (Potomac), succeeding Brigadier-General Adolph Wilhelm August Frederick von Steinwehr.

April 2 1863: Major-General Oliver Otis Howard assumed command of XI Corps (Potomac), succeeding Major-General Carl Schurz.

July 1 1863: Brigadier-General Carl Schurz assumed temporary command of XI Corps (Potomac), succeeding Major-General Oliver Otis Howard. Major-General Oliver Otis Howard assumed command of XI Corps (Potomac), succeeding Major-General Carl Schurz.

September 25 1863: XI Corps (Potomac) transferred from the Army of the Potomac to Hooker’s Command (Cumberland).

XII Corps Potomac

(Transferred from Reserve Grand Division, February 5 1863-September 25 1863, transferred to Hooker’s Command Cumberland)

  • Henry Warner Slocum (February 5 1863-July 1 1863)
  • Alpheus Starkey Williams (temporary July 1 1863-July 4 1863)
  • Henry Warner Slocum (July 4 1863-August 31 1863)
  • Alpheus Starkey Williams (temporary August 31 1863-September 13 1863)
  • Henry Warner Slocum (September 13 1863-September 25 1863)

February 5 1863: The Reserve Grand Division of the Army of the Potomac was discontinued. XII Corps Potomac transferred to the Army of the Potomac. Major-General Henry Warner Slocum retained command of XII Corps (Potomac).

July 1 1863: Brigadier-General Alpheus Starkey Williams assumed temporary command of XII Corps (Potomac), succeeding Major-General Henry Warner Slocum.

July 4 1863: Major-General Henry Warner Slocum assumed command of XII Corps (Potomac), succeeding Brigadier-General Alpheus Starkey Williams.

August 31 1863: Brigadier-General Alpheus Starkey Williams assumed temporary command of XII Corps (Potomac), succeeding Major-General Henry Warner Slocum.

September 13 1863: Major-General Henry Warner Slocum assumed command of XII Corps (Potomac), succeeding Brigadier-General Alpheus Starkey Williams.

September 25 1863: XII Corps (Potomac) transferred from the Army of the Potomac to Hooker’s Command (Cumberland).

Cavalry Corps Potomac

(Established, February 12 1863-March 26 1865, transferred to Sheridan’s Cavalry Command)

  • George Stoneman (February 12 1863-May 22 1863)
  • Alfred Pleasonton (May 22 1863-January 22 1864)
  • David McMurtrie Gregg (temporary January 22 1864-February 12 1864)
  • Alfred Pleasonton (February 12 1864-March 25 1864)
  • David McMurtrie Gregg (temporary March 25 1864-April 4 1864)
  • Philip Henry Sheridan (April 4 1864-August 2 1864)
  • David McMurtrie Gregg (August 2 1864-February 10 1865)
  • John Irvin Gregg (temporary February 10 1865-February 24 1865)
  • Henry Eugene Davies (February 24 1865-March 25 1865)
  • Wesley Merritt (March 25 1865-March 26 1865)

February 12 1863: Cavalry Corps (Potomac) was established in the Army of the Potomac. Major-General George Stoneman assumed command of Cavalry Corps (Potomac).

May 22 1863: Brigadier-General Alfred Pleasonton assumed command of Cavalry Corps (Potomac), succeeding Major-General George Stoneman.

January 22 1864: Brigadier-General David McMurtrie Gregg assumed command of Cavalry Corps (Potomac), succeeding Major-General Alfred Pleasonton.

February 12 1864: Major-General Alfred Pleasonton assumed command of Cavalry Corps (Potomac), succeeding Brigadier-General David McMurtrie Gregg.

March 25 1864: Brigadier-General David McMurtrie Gregg assumed temporary command of Cavalry Corps (Potomac), succeeding Major-General Alfred Pleasonton.

April 4 1864: Major-General Philip Henry Sheridan assumed command of Cavalry Corps (Potomac), succeeding Brigadier-General David McMurtrie Gregg.

August 2 1864: Brigadier-General David McMurtrie Gregg assumed command of Cavalry Corps (Potomac), succeeding Major-General Philip Henry Sheridan.

February 10 1865: Colonel John Irvin Gregg assumed command of Cavalry Corps (Potomac), succeeding Major-General David McMurtrie Gregg.

February 24 1865: Brigadier-General Henry Eugene Davies assumed command of Cavalry Corps (Potomac), succeeding Colonel John Irvin Gregg.

March 25 1865: Brigadier-General Wesley Merritt assumed command of Cavalry Corps (Potomac), succeeding Brigadier-General Henry Eugene Davies.

March 26 1865: Cavalry Corps (Potomac) transferred from the Army of the Potomac to Sheridan’s Cavalry Command (Potomac).

IX Corps Potomac

(Transferred from Army of the Ohio, April 13 1864-May 24 1864, transferred to Department of the Potomac)

  • Ambrose Everett Burnside (April 13 1864-May 24 1864)

April 13 1864: IX Corps transferred from the Army of the Ohio to the Department of the Potomac. Major-General Ambrose Everett Burnside assumed command of IX Corps (Potomac), succeeding Major-General John Grubb Parke.

May 24 1864: IX Corps was officially transferred from the Department of the Potomac to the Army of the Potomac.

IX Corps Potomac

(Transferred from Department of the Potomac, May 24 1864-April 19 1865, transferred to Military Division of the James)

  • Ambrose Everett Burnside (May 24 1864-August 14 1864)
  • John Grubb Parke (temporary August 14 1864-August 22 1864, August 22 1864-September 1 1864)
  • Orlando Bolivar Willcox (temporary September 1 1864-September 9 1864)
  • John Grubb Parke (September 9 1864-December 31 1864)
  • Orlando Bolivar Willcox (temporary December 31 1864-January 12 1865)
  • John Grubb Parke (January 12 1865-January 24 1865)
  • Orlando Bolivar Willcox (temporary January 24 1865-February 2 1865)
  • John Grubb Parke (February 2 1865-April 19 1865)

May 24 1864: IX Corps was officially transferred from the Department of the Potomac to the Army of the Potomac. Major-General Ambrose Everett Burnside retained command of IX Corps (Potomac).

August 14 1864: Major-General John Grubb Parke assumed temporary command of IX Corps (Potomac), succeeding Major-General Ambrose Everett Burnside.

August 22 1864: Major-General John Grubb Parke assumed full command of IX Corps (Potomac).

September 1 1864: Brigadier-General Orlando Bolivar Willcox assumed temporary command of IX Corps (Potomac), succeeding Major-General John Grubb Parke.

September 9 1864: Major-General John Grubb Parke assumed command of IX Corps (Potomac), succeeding Brigadier-General Orlando Bolivar Willcox.

December 31 1864: Brigadier-General Orlando Bolivar Willcox assumed temporary command of IX Corps (Potomac), succeeding Major-General John Grubb Parke.

January 12 1865: Major-General John Grubb Parke assumed command of IX Corps (Potomac), succeeding Brigadier-General Orlando Bolivar Willcox.

January 24 1865: Brigadier-General Orlando Bolivar Willcox assumed temporary command of IX Corps (Potomac), succeeding Major-General John Grubb Parke.

February 2 1865: Major-General John Grubb Parke assumed command of IX Corps (Potomac), succeeding Brigadier-General Orlando Bolivar Willcox.

April 19 1865: IX Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James.

VI Corps Potomac

(Transferred from Army of the Shenandoah, December 6 1864-April 19 1865, transferred to Military Division of the James)

  • Horatio Gouverneur Wright (December 6 1864-January 16 1865)
  • George Washington Getty (temporary January 16 1865-February 11 1865)
  • Horatio Gouverneur Wright (February 11 1865-April 19 1865)

December 6 1864: VI Corps (Shenandoah) transferred from the Army of the Shenandoah to the Army of the Potomac. Major-General Horatio Gouverneur Wright retained command of VI Corps (Potomac).

January 16 1865: Brigadier-General George Washington Getty assumed temporary command of VI Corps (Potomac), succeeding Major-General Horatio Gouverneur Wright.

February 11 1865: Major-General Horatio Gouverneur Wright assumed command of VI Corps (Potomac), succeeding Brigadier-General George Washington Getty.

April 19 1865: VI Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James.

Sheridan’s Cavalry Command Potomac

(Established, from Cavalry Corps Shenandoah, March 26 1865-April 19 1865, transferred to Military Division of the James)

  • Philip Henry Sheridan (March 26 1865-April 19 1865)

March 26 1865: Sheridan’s Cavalry Command was established in the Department of the Potomac. It comprised the combined cavalry forces of the Army of the Potomac, the Army of the James and the Army of the Shenandoah. Major-General Philip Henry Sheridan assumed command of Sheridan’s Cavalry Command (Potomac). Cavalry Corps (Potomac) transferred from the Army of the Potomac to Sheridan’s Cavalry Command (Potomac).

April 19 1865: Sheridan’s Cavalry Command (Potomac) transferred with the Department of the Potomac to the Military Division of the James.

Cavalry Corps Potomac

(Transferred from Army of the Potomac, March 26 1865-April 19 1865, transferred to Military Division of the James)

  • Wesley Merritt (March 26 1865-April 19 1865)

March 26 1865: Cavalry Corps (Potomac) transferred from the Army of the Potomac to Sheridan’s Cavalry Command (Potomac). Brigadier-General Wesley Merritt retained command of Cavalry Corps Potomac.

April 19 1865: Cavalry Corps (Potomac) transferred with Sheridan’s Cavalry Command (Potomac) to the Military Division of the James.


Department of Western Virginia

Union High Command on September 19 1861 Eastern and Capital Theatre

  • Department of the Potomac: George Brinton McClellan
    • Army of the Potomac: George Brinton McClellan
  • Department of Virginia: John Ellis Wool
  • Department of Western Virginia: William Starke Rosecrans awaited

(Established, September 19 1861-March 11 1862, transferred to Mountain Department)

  • William Starke Rosecrans (September 19 1861-March 11 1862)

September 19 1861: The Department of Western Virginia was established, comprising Virginia west of the Blue Ridge Mountains. Its territory was taken from the Department of the East and the Department of the Ohio but not until 9thNovember 1861 from the Department of the Potomac. Brigadier-General William Starke Rosecrans was appointed to command the Department of Western Virginia, arriving on 11th October 1861.

October 11 1861: The District of the Kanawha was established in the Department of Western Virginia.

October 11 1861: Brigadier-General William Starke Rosecrans arrived to command the Department of Western Virginia.

November 9 1861: The territory of Virginia west of the Blue Ridge Mountains transferred to the Department of Western Virginia from the Department of the Potomac.

December 19 1861: The Cheat Mountain District was established in the Department of Western Virginia, comprising the vicinity of Beverly, Elkwater and Huttonsville.

December 20 1861: The Railroad District was established in the Department of Western Virginia, comprising the territory of the former District of Grafton in the Department of the Ohio and all railroads in western Virginia.

March 3 1862: The territory west of Flintstone Creek, Maryland, South Branch Mountain, North Shenandoah Mountain, Purgatory Mountain, Blue Ridge Mountain and Allegheny Mountain were transferred from the Department of the Potomac to the Department of Western Virginia.

March 11 1862: The Department of Western Virginia was discontinued. Its territory transferred to the Mountain Department.

District of the Kanawha

(Established, October 11 1861-March 11 1862, transferred to Mountain Department)

  • Jacob Dolson Cox (October 11 1861-March 11 1862)

October 11 1861: The District of the Kanawha was established in the Department of Western Virginia, comprising Point Pleasant, Buffalo, Charleston, Gauley Bridge, Summerville and Fayetteville. Brigadier-General Jacob Dolson Cox assumed command of the District of the Kanawha.

March 11 1862: The District of the Kanawha transferred from the Department of Western Virginia to the Mountain Department, comprising the valleys of the Kanawha, New and Guyandotte Rivers and the mouth of the Big Sandy River.

Cheat Mountain District

(Established, December 19 1861-March 11 1862, transferred to Mountain Department)

  • Robert Huston Milroy (December 19 1861-March 11 1862)

December 19 1861: The Cheat Mountain District was established in the Department of Western Virginia, comprising the vicinity of Beverly, Elkwater and Huttonsville. Brigadier-General Robert Huston Milroy assumed command of the Cheat Mountain District.

March 11 1862: The Cheat Mountain District transferred from the Department of Western Virginia to the Mountain Department, comprising all the territory west of the Allegheny Mountains south of the Baltimore & Ohio Railroad, east of the Summerville-Weston Road and north of the Gauley River.

Railroad District

(Established, from District of Grafton, December 20 1861-March 11 1862, transferred to Mountain Department)

  • Benjamin Franklin Kelley (December 20 1861-March 11 1862)

December 20 1861: The Railroad District was established in the Department of Western Virginia, comprising the territory of the former District of Grafton in the Department of the Ohio and all railroads in western Virginia. Brigadier-General Benjamin Franklin Kelley assumed command of the Railroad District.

March 11 1862: The Railroad District transferred from the Department of Western Virginia to the Mountain Department.


Mountain Department

Union High Command on March 11 1862 Eastern and Capital Theatre

  • Mountain Department: William Starke Rosecrans interim John Charles Frémont awaited
    • Cheat Mountain District: Robert Huston Milroy
    • Railroad District: Benjamin Franklin Kelley
    • District of the Kanawha: Jacob Dolson Cox
    • District of the Cumberland: Robert Cumming Schenck
    • District of the Gap: Samuel Powhatan Carter
    • District of the Valley of the Big Sandy River: James Abram Garfield
  • Department of the Potomac: George Brinton McClellan
    • District of Harper’s Ferry and Cumberland: James Shields
    • Army of the Potomac: George Brinton McClellan
      • I Corps Potomac: Irvin McDowell
      • II Corps Potomac: Edwin Vose Sumner
      • III Corps Potomac: Samuel Peter Heintzelman
      • IV Corps Potomac: Erasmus Darwin Keyes
      • V Corps Potomac: Nathaniel Prentiss Banks
  • Department of Virginia: John Ellis Wool

(Established, from Department of Western Virginia, March 11 1862-June 26 1862, discontinued, to I Corps Virginia)

  • William Starke Rosecrans (interim March 11 1862-March 29 1862)
  • John Charles Frémont (March 11 1862-June 26 1862)

March 11 1862: The Mountain Department was established. Its territory included the parts of Michigan, Ohio, Kentucky and Tennessee west of a line running north-south through Knoxville, Tennessee; all of Maryland and Virginia west of the line from Flintstone Creek, Maryland, to South Branch Mountain, Town Hill Mountain, Branch Mountain (Big Ridge), North Shenandoah Mountain, Purgatory Mountain, Blue Ridge Mountain and Allegheny Mountain to the border of North Carolina. This territory was taken from the Department of the Ohio and the Department of Western Virginia. Major-General John Charles Frémont was appointed to command the Mountain Department, arriving on 29th March 1862. Brigadier-General William Starke Rosecrans retained interim command of the Mountain Department pending the arrival of Major-General John Charles Frémont. The Department of Western Virginia was discontinued, and it territory transferred to the Mountain Department. The Railroad District transferred from the Department of Western Virginia to the Mountain Department. The Cheat Mountain District transferred from the Department of Western Virginia to the Mountain Department. The District of the Kanawha transferred from the Department of Western Virginia to the Mountain Department. The District of the Cumberland was established in the Mountain Department. The District of the Gap was established in the Mountain Department. The District of the Valley of the Big Sandy River was established in the Mountain Department.

March 29 1862: Major-General John Charles Frémont arrived to command the Mountain Department, succeeding interim commander Major-General William Starke Rosecrans.

April 7 1862: The District of the Cumberland was discontinued.

June 8 1862: The territories of Eastern Kentucky and eastern Tennessee were transferred from the Mountain Department to the Department (Military Division) of the Mississippi. The parts of Virginia west of the road running from Williamsport to Martinsburg, Winchester, Strasburg, Harrisonville, Staunton and then south to the Blue Ridge Mountains were transferred from the Department of the Shenandoah to the Mountain Department. The District of the Valley of the Big Sandy River was discontinued.

June 26 1862: The Mountain Department was discontinued. The District of the Gap was discontinued. The District of the Kanawha was discontinued. The Cheat Mountain District was discontinued. The Railroad District was discontinued. I Corps (Virginia) was established to include the field forces formerly in the Mountain Department.

Railroad District

(Transferred, from Department of Western Virginia, March 11 1862-June 26 1862, discontinued)

  • Benjamin Franklin Kelley (March 11 1862-June 26 1862)

March 11 1862: The Railroad District transferred from the Department of Western Virginia to the Mountain Department, comprising the lines of the Baltimore & Ohio Railroad in Virginia west of the Allegheny Mountains and was extended to include the vicinity of Grafton, Clarksburg, Parkersburg and Wheeling, in western Virginia. Brigadier-General Benjamin Franklin Kelley retained command of the Railroad District.

June 26 1862: The Railroad District was discontinued.

Cheat Mountain District

(Transferred from Department of Western Virginia, March 11 1862-June 26 1862, discontinued)

  • Robert Huston Milroy (March 11 1862-April 12 1862)
  • Thomas Maley Harris (April 12 1862-June 26 1862)

March 11 1862: The Cheat Mountain District transferred from the Department of Western Virginia to the Mountain Department, comprising all the territory west of the Allegheny Mountains south of the Baltimore & Ohio Railroad, east of the Summerville-Weston Road and north of the Gauley River. Brigadier-General Robert Huston Milroy retained command of the Cheat Mountain District.

April 12 1862: Lieutenant-Colonel Thomas Maley Harris assumed command of the Cheat Mountain District, succeeding Brigadier-General Robert Huston Milroy.

June 26 1862: The Cheat Mountain District was discontinued.

District of the Kanawha

(Transferred from Department of Western Virginia, March 11 1862-June 26 1862, discontinued)

  • Jacob Dolson Cox (March 11 1862-June 26 1862)

March 11 1862: The District of the Kanawha transferred from the Department of Western Virginia to the Mountain Department, comprising the valleys of the Kanawha, New and Guyandotte Rivers and the mouth of the Big Sandy River. Brigadier-General Jacob Dolson Cox retained command of the District of the Kanawha.

June 26 1862: The District of the Kanawha was discontinued.

District of the Cumberland

(Established, March 11 1862-April 7 1862, discontinued)

  • Robert Cumming Schenck (March 11 1862-April 7 1862)

March 11 1862: The District of the Cumberland was established in the Mountain Department, comprising the territory east of the Allegheny Mountains controlled by the Mountain Department. Brigadier-General Robert Cumming Schenck assumed command of the District of the Cumberland.

April 7 1862: The District of the Cumberland in the Mountain Department was discontinued.

District of the Gap

(Established, March 11 1862-June 26 1862, discontinued)

  • Samuel Powhatan Carter (March 11 1862-June 26 1862)

March 11 1862: The District of the Gap was established in the Mountain Department. It consisted of the territory west of the valley of the Big Sandy River within the Mountain Department. It was controlled operationally by the Army of the Ohio. Lieutenant USN Samuel Powhatan Carter assumed command of the District of the Gap.

June 26 1862: The District of the Gap was discontinued.

District of the Valley of the Big Sandy River

(Established, March 11 1862-June 8 1862, discontinued)

  • James Abram Garfield (March 11 1862-June 8 1862)

March 11 1862: The District of the Valley of the Big Sandy River was established in the Mountain Department. Brigadier-General James Abram Garfield assumed command of the District of the Valley of the Big Sandy River.

June 8 1862: The District of the Valley of the Big Sandy River was discontinued.


Military District of Washington

Union High Command on March 12 1862 Eastern and Capital Theatre

  • Mountain Department: William Starke Rosecrans interim John Charles Frémont awaited
    • Cheat Mountain District: Robert Huston Milroy
    • Railroad District: Benjamin Franklin Kelley
    • District of the Kanawha: Jacob Dolson Cox
    • District of the Cumberland: Robert Cumming Schenck
    • District of the Gap: Samuel Powhatan Carter
    • District of the Valley of the Big Sandy River: James Abram Garfield
  • Department of the Potomac: George Brinton McClellan
    • Army of the Potomac: George Brinton McClellan
      • I Corps Potomac: Irvin McDowell
      • II Corps Potomac: Edwin Vose Sumner
      • III Corps Potomac: Samuel Peter Heintzelman
      • IV Corps Potomac: Erasmus Darwin Keyes
      • V Corps Potomac: Nathaniel Prentiss Banks
  • Department of Virginia: John Ellis Wool
  • Military District of Washington: James Samuel Wadsworth

(Established, March 12 1862-April 4 1862, transferred to Department of the Rappahannock)

  • James Samuel Wadsworth (March 12 1862-April 4 1862)

March 12 1862: The Military District of Washington was established as an independent command under the War Department, comprising the District of Columbia, Alexandria in Virginia and Port Washington. Brigadier-General James Samuel Wadsworth assumed command of the Military District of Washington.

April 4 1862: The Military District of Washington transferred to the Department of the Rappahannock.


Middle Department

Union High Command on March 22 1862 Eastern and Capital Theatre

  • Middle Department: John Adams Dix
    • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
  • Mountain Department: William Starke Rosecrans interim John Charles Frémont awaited
    • Cheat Mountain District: Robert Huston Milroy
    • Railroad District: Benjamin Franklin Kelley
    • District of the Kanawha: Jacob Dolson Cox
    • District of the Cumberland: Robert Cumming Schenck
    • District of the Gap: Samuel Powhatan Carter
    • District of the Valley of the Big Sandy River: James Abram Garfield
  • Department of the Potomac: George Brinton McClellan
    • Army of the Potomac: George Brinton McClellan
      • I Corps Potomac: Irvin McDowell
      • II Corps Potomac: Edwin Vose Sumner
      • III Corps Potomac: Samuel Peter Heintzelman
      • IV Corps Potomac: Erasmus Darwin Keyes
      • V Corps Potomac: Nathaniel Prentiss Banks
  • Department of Virginia: John Ellis Wool
  • Military District of Washington: James Samuel Wadsworth

(Established, March 22 1862-August 7 1864, transferred to Middle Military Division)

  • John Adams Dix (March 22 1862-June 1 1862 interim June 9 1862)
  • John Ellis Wool (June 1 1862-December 17 1862 interim December 22 1862)
  • Robert Cumming Schenck (December 17 1862-March 12 1863)
  • William Walton Morris (temporary March 12 1863-March 20 1863)
  • Robert Cumming Schenck (March 20 1863-August 10 1863)
  • William Walton Morris (temporary August 10 1863-August 31 1863)
  • Robert Cumming Schenck (August 31 1863-September 22 1863)
  • William Walton (temporary September 22 1863-September 28 1863)
  • Erastus Barnard Tyler (temporary September 28 1863-October 10 1863)
  • Robert Cumming Schenck (October 10 1863-November 21 1863 interim December 5 1863)
  • Henry Hayes Lockwood (November 21 1863-March 12 1864 interim March 22 1864)
  • Lewis Wallace (March 12 1864-August 7 1864)

March 22 1862: The Middle Department was established, comprising New Jersey, Pennsylvania, Delaware, the Eastern Shores of Virginia and Maryland and Cecil, Harford, Baltimore, and Anne Arundel counties in Maryland. New Jersey, Pennsylvania, Delaware, the Eastern Shore of Maryland and of Virginia, and Cecil, Hartford, Baltimore and Anne Arundel counties of Maryland were transferred from the Department of the Potomac to the Middle Department. New Jersey, Pennsylvania, Delaware, the Eastern Shore of Maryland and of Virginia, and Cecil, Hartford, Baltimore and Anne Arundel counties of Maryland were transferred from the Department of the Potomac to the Middle Department. Major-General John Adams Dix assumed command of the Middle Department. The District of the Eastern Shore of Maryland was established in the Middle Department.

June 1 1862: Major-General John Ellis Wool was appointed to command the Middle Department, arriving on June 9th 1862.

June 9 1862: Major-General John Ellis Wool arrived to command the Middle Department, succeeding Major-General John Adams Dix.

July 12 1862: VIII Corps (Middle) was organised in the Middle Department. Major-General John Ellis Wool assumed command of VIII Corps (Middle).

December 17 1862: Brigadier-General Robert Cumming Schenck was appointed to command the Middle Department, arriving on December 22 1862, to succeed Major-General John Ellis Wool.

December 22 1862: Major-General Robert Cumming Schenck arrived to assume command of the Middle Department, succeeding Major-General John Ellis Wool.

February 6 1863: The state of New Jersey transferred from the Middle Department to the Department of the East.

March 12 1863: Colonel William Walton Morris assumed temporary command of the Middle Department, succeeding Major-General Robert Cumming Schenck.

March 16 1863: The District of Western Virginia was discontinued, and the territory of Western Virginia transferred from the Department of the Ohio to the Middle Department.

March 20 1863: Brigadier-General Robert Cumming Schenck assumed command of the Middle Department, succeeding Colonel William Walton Morris.

June 9 1863: Pennsylvania west of Johnstown and the Laurel Hill mountains, the counties of Hancock, Brooke and Ohio in the West Virginia “panhandle”, and the Ohio counties of Columbiana, Jefferson and Belmont, were transferred from the Middle Department and the Department of the Ohio to the Department of the Monongahela. Pennsylvania east of Johnstown and the Laurel Hill Mountains transferred from the Middle Department to the Department of the Susquehanna. Gallipolis, Ohio, transferred from the Department of the Ohio to the Middle Department.

July 3 1863: The District of Delaware was established in the Middle Department, comprising the state of Delaware.

August 3 1863: The territory of Maryland west of the Monocacy River and the territory around Harper’s Ferry were transferred from the Middle Department and the Department of the Potomac to the Department of West Virginia.

August 10 1863: Colonel William Walton Morris assumed temporary command of the Middle Department, succeeding Major-General Robert Cumming Schenck.

August 31 1863: Brigadier-General Robert Cumming Schenck assumed command of the Middle Department, succeeding Colonel William Walton Morris.

September 22 1863: Colonel William Walton Morris assumed temporary command of the Middle Department, succeeding Brigadier-General Robert Cummings Schenck.

September 28 1863: Brigadier-General Erastus Barnard Tyler assumed temporary command of the Middle Department, succeeding Colonel William Walton Morris.

October 10 1863: Brigadier-General Robert Cumming Schenck assumed command of the Middle Department, succeeding Brigadier-General Erastus Barnard Tyler.

November 21 1863: Brigadier-General Henry Hayes Lockwood was appointed to command the Middle Department, arriving on 5th December 1863, to succeed Major-General Robert Cumming Schenck.

December 5 1863: Brigadier-General Henry Hayes Lockwood arrived to command the Middle Department, succeeding Major-General Robert Cumming Schenck.

December 21 1863: Northampton and Accomac counties of Virginia were transferred from the Middle Department to the Department of Virginia and North Carolina.

March 12 1864: Major-General Lewis Wallace was appointed to command the Middle Department, arriving March 22nd 1864, to succeed Brigadier-General Henry Hayes Lockwood.

March 22 1864: Major-General Lewis Wallace arrived to command the Middle Department, succeeding Brigadier-General Henry Hayes Lockwood.

August 7 1864: The Middle Department transferred to the Middle Military Division. The District of the Eastern Shore of Maryland transferred with the Middle Department to the Middle Military Division. The District of Delaware transferred with the Middle Department to the Middle Military Division. VIII Corps (Middle) transferred with the Middle Department to the Middle Military Division.

District of the Eastern Shore of Maryland

(Established, March 22 1862-August 7 1864, transferred to Middle Military Division)

  • Henry Hayes Lockwood (March 22 1862-August 7 1864)

March 22 1862: The District of the Eastern Shore of Maryland was established in the Middle Department. Brigadier-General Henry Hayes Lockwood assumed command of the District of the Eastern Shore of Maryland.

August 7 1864: The District of the Eastern Shore of Maryland transferred with the Middle Department to the Middle Military Division.

District of Delaware

(Established, July 3 1863-August 7 1864, transferred to Middle Military Division)

  • Daniel Tyler (July 3 1863-January 19 1864)
  • Henry Bethel Judd (temporary January 19 1864-April 4 1864)
  • John Reese Kenly (April 4 1864-July 20 1864)
  • Henry Hayes Lockwood (July 20 1864-August 7 1864)

July 3 1863: The District of Delaware was established in the Middle Department, comprising the state of Delaware. Brigadier-General Daniel Tyler assumed command of the District of Delaware.

January 19 1864: Major Henry Bethel Judd assumed temporary command of the District of Delaware, succeeding Brigadier-General Daniel Tyler.

March 12 1864: Fort Delaware was detached from the District of Delaware (Middle Department) to independent command under the War Department.

April 4 1864: Brigadier-General John Reese Kenly assumed command of the District of Delaware, succeeding Major Henry Bethel Judd.

July 20 1864: Brigadier-General Henry Hayes Lockwood assumed command of the District of Delaware, succeeding Brigadier-General John Reese Kenly.

August 7 1864: The District of Delaware transferred with the Middle Department to the Middle Military Division.

VIII Corps Middle

(Established, July 12 1862-August 7 1864, transferred to Middle Military Division)

  • John Ellis Wool (July 12 1862-December 22 1862)
  • Robert Cumming Schenck (December 22 1862-March 12 1863)
  • William Walton Morris (temporary March 12 1863-March 20 1863)
  • Robert Cumming Schenck (March 20 1863-August 10 1863)
  • William Walton Morris (temporary August 10 1863-August 31 1863)
  • Robert Cumming Schenck (August 31 1863-September 22 1863)
  • William Walton Morris (temporary September 22 1863-September 28 1863)
  • Erastus Barnard Tyler (temporary September 28 1863-October 10 1863)
  • Robert Cumming Schenck (October 10 1863-December 5 1863)
  • Henry Hayes Lockwood (December 5 1863-March 12 1864 interim March 22 1864)
  • Lewis Wallace (March 12 1864-August 7 1864)

July 12 1862: VIII Corps (Middle) was established in the Middle Department. Major-General John Ellis Wool assumed command of VIII Corps (Middle).

December 22 1862: Major-General Robert Cumming Schenck assumed command of VIII Corps (Middle), succeeding Major-General John Ellis Wool.

March 12 1863: Colonel William Walton Morris assumed temporary command of VIII Corps (Middle), succeeding Major-General Robert Cumming Schenck.

March 20 1863: Brigadier-General Robert Cumming Schenck assumed command of VIII Corps, succeeding Colonel William Walton Morris.

August 10 1863: Colonel William Walton Morris assumed temporary command of VIII Corps (Middle), succeeding Major-General Robert Cumming Schenck.

August 31 1863: Major-General Robert Cumming Schenck assumed command of VIII Corps (Middle), succeeding Colonel William Walton Morris.

September 22 1863: Colonel William Walton Morris assumed temporary command of VIII Corps (Middle), succeeding Brigadier-General Robert Cummings Schenck.

September 28 1863: Brigadier-General Erastus Barnard Tyler assumed temporary command VIII Corps (Middle), succeeding Colonel William Walton Morris.

October 10 1863: Brigadier-General Robert Cumming Schenck assumed command of VIII Corps (Middle), succeeding Brigadier-General Erastus Barnard Tyler.

December 5 1863: Brigadier-General Henry Hayes Lockwood assumed command of VIII Corps (Middle), succeeding Major-General Robert Cumming Schenck.

March 12 1864: Major-General Lewis Wallace was appointed to command VIII Corps (Middle), arriving on March 22nd 1864, to succeed Brigadier-General Henry Hayes Lockwood.

March 22 1864: Major-General Lewis Wallace arrived to command VIII Corps (Middle), succeeding Brigadier-General Henry Hayes Lockwood.

August 7 1864: VIII Corps (Middle) transferred with the Middle Department to the Middle Military Division.


Department of the Rappahannock

Union High Command on April 4 1862 Eastern and Capital Theatre

  • Middle Department: John Adams Dix
    • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
  • Mountain Department: John Charles Frémont
    • Cheat Mountain District: Robert Huston Milroy
    • Railroad District: Benjamin Franklin Kelley
    • District of the Kanawha: Jacob Dolson Cox
    • District of the Cumberland: Robert Cumming Schenck
    • District of the Gap: Samuel Powhatan Carter
    • District of the Valley of the Big Sandy River: James Abram Garfield
  • Department of the Potomac: George Brinton McClellan
    • Army of the Potomac: George Brinton McClellan
      • II Corps Potomac: Edwin Vose Sumner
      • III Corps Potomac: Samuel Peter Heintzelman
      • IV Corps Potomac: Erasmus Darwin Keyes
  • Department of the Rappahannock: Irvin McDowell
    • Military District of Washington: James Samuel Wadsworth
  • Department of the Shenandoah: Nathaniel Prentiss Banks awaited
  • Department of Virginia: John Ellis Wool

(Established, from I Corps Potomac, April 4 1862-June 26 1862, discontinued, to III Corps Virginia)

  • Irvin McDowell (April 4 1862-June 26 1862)

April 4 1862: The Department of the Rappahannock was established, comprising the portion of Virginia east of the Blue Ridge and west of the Fredericksburg & Richmond Railroad, Washington and the District of Columbia and the part of Maryland between the Potomac and Patuxent Rivers, transferred from the Department of the Potomac. The territory of Maryland between the Potomac and Patuxent Rivers, the District of Columbia and Virginia east of the Blue Ridge Mountains and west of the Fredericksburg & Richmond Railroad transferred from the Department of the Potomac to the Department of the Rappahannock. I Corps (Potomac) was discontinued, and its forces incorporated into the Department of the Rappahannock. Major-General Irvin McDowell assumed command of the Department of the Rappahannock. The Military District of Washington transferred to the Department of the Rappahannock. Although the title was officially discontinued, the field forces of the Department of the Rappahannock effectively remained and were later renamed as I Corps (Potomac)

June 1 1862: The territory of Northeastern Virginia transferred from the Department of the Potomac to the Department of the Rappahannock.

June 8 1862: The Piedmont region and the Bull Run Mountains of Virginia were transferred from the Department of the Rappahannock to the Department of the Shenandoah.

June 26 1862: The Department of the Rappahannock was discontinued. The Military District of Washington transferred from the Department of the Rappahannock and transferred to the War Department.

Military District of Washington

(Transferred, from War Department, April 4 1862-June 26 1862, transferred to War Department)

  • James Samuel Wadsworth (April 4 1862-June 26 1862)

April 4 1862: The Military District of Washington transferred to the Department of the Rappahannock. Brigadier-General James Samuel Wadsworth retained command of the Military District of Washington

June 26 1862: The Military District of Washington transferred from the Department of the Rappahannock to the War Department.


Department of the Shenandoah

Union High Command on April 4 1862 Eastern and Capital Theatre

  • Middle Department: John Adams Dix
    • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
  • Mountain Department: John Charles Frémont
    • Cheat Mountain District: Robert Huston Milroy
    • Railroad District: Benjamin Franklin Kelley
    • District of the Kanawha: Jacob Dolson Cox
    • District of the Cumberland: Robert Cumming Schenck
    • District of the Gap: Samuel Powhatan Carter
    • District of the Valley of the Big Sandy River: James Abram Garfield
  • Department of the Potomac: George Brinton McClellan
    • Army of the Potomac: George Brinton McClellan
      • II Corps Potomac: Edwin Vose Sumner
      • III Corps Potomac: Samuel Peter Heintzelman
      • IV Corps Potomac: Erasmus Darwin Keyes
  • Department of the Rappahannock: Irvin McDowell
    • Military District of Washington: James Samuel Wadsworth
  • Department of the Shenandoah: Nathaniel Prentiss Banks awaited
  • Department of Virginia: John Ellis Wool

(Established, April 4 1862-June 26 1862, discontinued, to II Corps Virginia)

  • Nathaniel Prentiss Banks (April 4 1862-June 26 1862)

April 4 1862: The Department of the Shenandoah was established, comprising Maryland west of the Blue Ridge Mountains and east of the Mountain Department (namely, Flintstone Creek, south to Branch Mountain, Town Hill Mountain, Branch Big Ridge Mountain, North Shenandoah Mountain, Purgatory Mountain and Allegheny Mountain. The parts of Maryland and Virginia west of the Blue Ridge Mountains and east of the Mountain Department were transferred from the Department of the Potomac to the Department of the Shenandoah. V Corps (Potomac) was discontinued, and its forces incorporated into the Department of the Shenandoah. Major-General Nathaniel Prentiss Banks was appointed to command the Department of the Shenandoah, arriving on 12th April 1862.

April 12 1862: Major-General Nathaniel Prentiss Banks arrived to command the Department of the Shenandoah.

June 8 1862: The parts of Virginia west of the road running from Williamsport to Martinsburg, Winchester, Strasburg, Harrisonville, Staunton and then south to the Blue Ridge Mountains were transferred from the Department of the Shenandoah to the Mountain Department.

June 8 1862: The Piedmont region and the Bull Run Mountains of Virginia were transferred from the Department of the Rappahannock to the Department of the Shenandoah.

June 26 1862: The Department of the Shenandoah was discontinued.

Military District of Washington

(Transferred from Department of the Rappahannock, June 26 1862-February 2 1863, transferred to Department of Washington)

  • James Samuel Wadsworth (June 26 1862-September 7 1862)
  • Nathaniel Prentiss Banks (September 7 1862-October 27 1862)
  • Samuel Peter Heintzelman (October 27 1862-February 23 1863)

June 26 1862: The Military District of Washington transferred from the Department of the Rappahannock to the War Department. Brigadier-General James Samuel Wadsworth retained command of the Military District of Washington.

September 7 1862: Major-General Nathaniel Prentiss Banks assumed command of the Military District of Washington, succeeding Brigadier-General James Samuel Wadsworth.

October 27 1862: Major-General Samuel Peter Heintzelman assumed command of the Military District of Washington, succeeding Major-General Nathaniel Prentiss Banks.

February 2 1863: The Military District of Washington was discontinued, and its territory incorporated into the Department of Washington.


Army of Virginia

Union High Command on June 26 1862 Eastern and Capital Theatre

  • Middle Department: John Ellis Wool
    • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
  • Department of the Potomac: George Brinton McClellan
    • Army of the Potomac: George Brinton McClellan
      • II Corps Potomac: Edwin Vose Sumner
      • III Corps Potomac: Samuel Peter Heintzelman
      • IV Corps Potomac: Erasmus Darwin Keyes
      • V Corps Potomac: Fitz John Porter
      • VI Corps Potomac: William Buel Franklin
  • Military District of Washington: James Samuel Wadsworth
  • Army of Virginia: John Pope
    • I  Corps Virginia: John Charles Frémont
    • II Corps Virginia: Nathaniel Prentiss Banks
    • III Corps Virginia: Irvin McDowell

(Established, June 26 1862-September 2 1862, discontinued, to Department of the Potomac)

  • John Pope (June 26 1862-September 2 1862)

June 26 1862: The Army of Virginia was established under the War Department, operating within the territory of but independently of the Department of the Potomac. Major-General John Pope assumed command of the Army of Virginia. I Corps (Virginia) was established in the Army of Virginia, comprising the field forces formerly in the Mountain Department. II Corps (Virginia) was established in the Army of Virginia, comprising the field forces formerly in the Department of the Shenandoah. III Corps (Virginia) was established in the Army of Virginia, comprising the field forces formerly in the Department of the Rappahannock.

September 2 1862: The Army of Virginia transferred to the Department of the Potomac. I Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac. II Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac. III Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac.

I Corps Virginia

(Established, from Mountain Department, June 26 1862-September 2 1862, transferred to Department of the Potomac)

  • John Charles Frémont (June 26 1862-June 28 1862)
  • Robert Cumming Schenck (temporary June 28 1862-June 29 1862)
  • Franz Sigel (June 29 1862-July 7 1862)
  • Robert Cumming Schenck (temporary July 7 1862-July 12 1862)
  • Franz Sigel (July 12 1862-September 2 1862)

June 26 1862: I Corps (Virginia) was established, comprising the field forces formerly in the Mountain Department. Major-General John Charles Frémont assumed command I Corps (Virginia).

June 28 1862: Brigadier-General Robert Cumming Schenck assumed temporary command I Corps (Virginia), succeeding Major-General John Charles Frémont.

June 29 1862: Major-General Franz Sigel assumed command of I Corps (Army of Virginia), succeeding Brigadier-General Robert Cumming Schenck.

July 7 1862: Brigadier-General Robert Cumming Schenck assumed temporary command of I Corps (Virginia), succeeding Major-General Franz Sigel.

July 12 1862: Major-General Franz Sigel assumed command of I Corps (Virginia), succeeding Brigadier-General Robert Cumming Schenck.

September 2 1862: I Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac.

II Corps Virginia

(Established, from Mountain Department, June 26 1862-September 2 1862, transferred to Department of the Potomac)

  • Nathaniel Prentiss Banks (June 26 1862-September 2 1862)

June 26 1862: II Corps (Virginia) was established, comprising the field forces formerly in the Department of the Shenandoah. Major-General Nathaniel Prentiss Banks assumed command II Corps (Virginia).

September 2 1862: II Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac.

III Corps Virginia

(Established, from Mountain Department, June 26 1862-September 2 1862, transferred to Department of the Potomac)

  • Irvin McDowell (June 26 1862-September 2 1862)

June 26 1862: III Corps (Virginia) was established., comprising the field forces formerly in the Department of the Rappahannock. Major-General Irvin McDowell assumed command III Corps (Virginia).

September 2 1862: III Corps (Virginia) transferred with the Army of Virginia to the Department of the Potomac.


Department of Washington

Union High Command on February 2 1863 Eastern and Capital Theatre

  • Middle Department: Robert Cumming Schenck
    • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
    • VIII Corps Middle: Robert Cumming Schenck
  • Department of the Potomac: Joseph Hooker
    • Army of the Potomac: Joseph Hooker
      • Right Grand Division: Darius Nash Couch
        • II Corps Potomac: Oliver Otis Howard
        • IX Corps Potomac: John Sedgwick
      • Left Grand Division Potomac: William Farrar Smith
        • I Corps Potomac: John Fulton Reynolds
        • VI Corps Potomac: John Newton
      • Centre Grand Division Potomac: George Gordon Meade
        • III Corps Potomac: George Stoneman
        • V Corps Potomac: George Sykes
      • Reserve Grand Division Potomac: Franz Sigel
        • XI Corps Potomac: Carl Schurz temporary
        • XII Corps Potomac: Henry Warner Slocum
  • Department of Virginia: John Adams Dix
    • IV Corps Virginia: Erasmus Darwin Keyes
    • VII Corps Virginia: John Adams Dix
  • Department of Washington: Samuel Peter Heintzelman awaited
    • District of Alexandria: John Potts Slough
    • District of Washington: John Henry Martindale
    • XXII Corps Washington: Samuel Peter Heintzelman

(Established, from Military District of Washington, February 2 1863-August 7 1864, transferred to Middle Military Division)

  • Samuel Peter Heintzelman (February 2 1863-October 13 1863)
  • Christopher Columbus Augur (October 13 1863-August 7 1864)

February 2 1863: The Department of Washington was established, comprising the country north of the Potomac River in Maryland from Piscataway Creek to Annapolis Junction, to the mouth of the Monocacy River and south by Goose Creek and the mouth of the Bull Run Mountains to the mouth of the Occoquan Creek, transferred from the Military District of Washington and the Department of the Potomac. Major-General Samuel Peter Heintzelman was appointed to command the Department of Washington, arriving on 7th February 1863. XXII Corps (Washington) was established in the Department of Washington. The District of Alexandria was established in the Department of Washington. The District of Washington was established in the Department of Washington.

February 7 1863: Major-General Samuel Peter Heintzelman arrived to command the Department of Washington.

October 13 1863: Major-General Christopher Columbus Augur assumed command of the Department of Washington, succeeding Major-General Samuel Peter Heintzelman.

June 21 1864: St Mary’s county, Maryland, transferred from the Department of Virginia and North Carolina to the Department of Washington. The part of Maryland between the Potomac and Patuxent Rivers transferred from the Department of the Potomac to the Department of Washington.

July 7 1864: The District of St Mary’s transferred from the Department of Virginia and North Carolina to the Department of Washington. It comprised the county of St Mary’s in Maryland and the Point Lookout prison camp.

August 7 1864: The Department of Washington transferred to the Middle Military Division. The District of Alexandria transferred with the Department of Washington to the Middle Military Division. The District of Washington transferred with the Department of Washington to the Middle Military Division. The District of St Mary’s transferred with the Department of Washington to the Middle Military Division. XXII Corps (Washington) transferred with the Department of Washington to the Middle Military Division.

District of Alexandria

(Established, February 2 1863-August 7 1864, transferred to Middle Military Division)

  • John Potts Slough (February 2 1863-August 7 1864)

February 2 1863: The District of Alexandria was established and transferred to the Department of Washington, comprising the vicinity of Alexandria, Virginia. Brigadier-General John Potts Slough assumed command of the District of Alexandria.

August 7 1864: The District of Alexandria transferred with the Department of Washington to the Middle Military Division.

District of Washington

(Established, February 2 1863-August 7 1864, transferred to Middle Military Division)

  • John Henry Martindale (February 2 1863-May 2 1864)
  • Moses N Wisewell (May 2 1864-August 7 1864)

February 2 1863: The District of Washington was established in the Department of Washington, comprising the territory formerly under the authority of the Military District of Washington. Brigadier-General John Henry Martindale assumed command of the District of Washington.

May 2 1864: Colonel Moses N Wisewell assumed command of the District of Washington, succeeding John Henry Martindale.

August 7 1864: The District of Washington transferred with the Department of Washington to the Middle Military Division.

District of St Mary’s

(Transferred, from Department of Virginia and North Carolina, July 7 1864-August 7 1864, transferred to Middle Military Division)

  • James Barnes (July 7 1864-August 7 1864)

July 7 1864: The District of St Mary’s transferred from the Department of Virginia and North Carolina to the Department of Washington. It comprised the county of St Mary’s in Maryland and the Point Lookout prison camp. Brigadier-General James Barnes assumed command of the District of St Mary’s, succeeding Colonel Alonzo Granville Draper.

August 7 1864: The District of St Mary’s transferred with the Department of Washington to the Middle Military Division.

XXII Corps Washington

(Established, February 2 1863-August 7 1864, transferred to Middle Military Division)

  • Samuel Peter Heintzelman (February 2 1863-October 13 1863)
  • Christopher Columbus Augur (October 13 1863-August 7 1864)

February 2 1863: XXII Corps (Washington) was established in the Department of Washington. Major-General Samuel Peter Heintzelman assumed command of XXII Corps (Washington).

October 13 1863: Major-General Christopher Columbus Augur assumed command of XXII Corps (Washington), succeeding Major-General Samuel Peter Heintzelman.

August 7 1864: XXII Corps (Washington) transferred with the Department of Washington to the Middle Military Division.


Department of the Monongahela

Union High Command on June 9 1863 Eastern and Capital Theatre

  • Middle Department: Robert Cumming Schenck
    • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
    • VIII Corps Middle: Robert Cumming Schenck
  • Department of the Monongahela: William Thomas Harbaugh Brooks awaited
  • Department of the Potomac: Joseph Hooker
    • Army of the Potomac: Joseph Hooker
      • I Corps Potomac: John Fulton Reynolds
      • II Corps Potomac: Winfield Scott Hancock
      • III Corps Potomac: Daniel Edgar Sickles
      • V Corps Potomac: George Gordon Meade
      • VI Corps Potomac: John Sedgwick
      • XI Corps Potomac: Oliver Otis Howard
      • XII Corps Potomac: Henry Warner Slocum
      • Cavalry Corps Potomac: Alfred Pleasonton
  • Department of the Susquehanna: Darius Nash Couch awaited
  • Department of Virginia: Erasmus Darwin Keyes
    • IV Corps Virginia: Erasmus Darwin Keyes
    • VII Corps Virginia: John Adams Dix
  • Department of Washington: Samuel Peter Heintzelman
    • District of Alexandria: John Potts Slough
    • District of Washington: John Henry Martindale
    • XXII Corps Washington: Samuel Peter Heintzelman

(Established, June 9 1863-April 6 1864, district, to Department of the Susquehanna)

  • William Thomas Harbaugh Brooks (June 9 1863-April 6 1864)

June 9 1863: The Department of the Monongahela was established, with headquarters at Pittsburgh, Pennsylvania, comprising Pennsylvania west of Johnstown and the Laurel Hill mountains, the counties of Hancock, Brooke and Ohio in the West Virginia “panhandle”, and the Ohio counties of Columbiana, Jefferson and Belmont. These territories were transferred from the Middle Department and the Department of the Ohio. Columbiana, Jefferson and Belmont counties, Ohio, were transferred from the District of Ohio in the Department of the Ohio to the Department of the Monongahela. Major-General William Thomas Harbaugh Brooks was appointed to command the Department of the Monongahela, arriving on 11th June 1863.

June 9 1863: Major-General William Thomas Harbaugh Brooks arrived to command the Department of the Monongahela.

October 12 1863: Hancock, Brooke and Ohio counties in West Virginia were transferred from the Department of the Monongahela to the Department of West Virginia. The counties of Columbiana, Belmont and Jefferson in Ohio were transferred from the Department of the Monongahela to the Department of West Virginia.

April 6 1864: The Department of the Monongahela was discontinued, and its territory allocated to the Department of the Susquehanna.


Department of the Susquehanna

Union High Command on June 9 1863 Eastern and Capital Theatre

  • Middle Department: Robert Cumming Schenck
    • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
    • VIII Corps Middle: Robert Cumming Schenck
  • Department of the Monongahela: William Thomas Harbaugh Brooks awaited
  • Department of the Potomac: Joseph Hooker
    • Army of the Potomac: Joseph Hooker
      • I Corps Potomac: John Fulton Reynolds
      • II Corps Potomac: Winfield Scott Hancock
      • III Corps Potomac: Daniel Edgar Sickles
      • V Corps Potomac: George Gordon Meade
      • VI Corps Potomac: John Sedgwick
      • XI Corps Potomac: Oliver Otis Howard
      • XII Corps Potomac: Henry Warner Slocum
      • Cavalry Corps Potomac: Alfred Pleasonton
  • Department of the Susquehanna: Darius Nash Couch awaited
  • Department of Virginia: Erasmus Darwin Keyes
    • IV Corps Virginia: Erasmus Darwin Keyes
    • VII Corps Virginia: John Adams Dix
  • Department of Washington: Samuel Peter Heintzelman
    • District of Alexandria: John Potts Slough
    • District of Washington: John Henry Martindale
    • XXII Corps Washington: Samuel Peter Heintzelman

(Established, June 9 1863-August 7 1864, transferred to Middle Military Division)

  • Darius Nash Couch (June 9 1863-August 7 1864)

June 9 1863: The Department of the Susquehanna was established with headquarters at Chambersburg, Pennsylvania. The territory of authority comprised Pennsylvania east of Johnstown and the Laurel Hill Mountains transferred from the Middle Department. Major-General Darius Nash Couch was appointed to command the Department of the Susquehanna, arriving on 11th June 1863.

June 9 1863: Major-General Darius Nash Couch arrived to command the Department of the Susquehanna.

August 20 1863: Lehigh District was established in the Department of the Susquehanna, comprising the counties of Berks, Lehigh, Schuylkill, Northampton, Carbon, Monroe, Luzerne and Columbia counties in Pennsylvania.

April 6 1864: The Department of the Monongahela was discontinued, and its territory allocated to the Department of the Susquehanna.

June 27 1864: District of the Monongahela was established in the Department of the Susquehanna, comprising the state of Pennsylvania west of Laurel Hill and Columbiana, Belmont and Jefferson counties in Ohio.

July 31 1864: The District of Brandywine was established in the Department of the Susquehanna, comprising the territory between the Blue Ridge Mountains and the Susquehanna River and Dauphine, Lancaster, Chester, Delaware, Bucks, Philadelphia and Montgomery counties, Pennsylvania.

August 7 1864: The Department of the Susquehanna transferred to the Middle Military Division. Lehigh District transferred with the Department of the Susquehanna to the Middle Military Division. The District of the Monongahela transferred with the Department of the Susquehanna to the Middle Military Division. The District of the Brandywine transferred with the Department of the Susquehanna to the Middle Military Division.

Lehigh District

(Established, August 20 1863-August 7 1864, transferred to Middle Military Division)

  • Franz Sigel (August 20 1863-August 7 1864)

August 20 1863: Lehigh District was established in the Department of the Susquehanna, comprising the counties of Berks, Lehigh, Schuylkill, Northampton, Carbon, Monroe, Luzerne and Columbia counties in Pennsylvania. Major-General Franz Sigel was assigned to command Lehigh District; de facto command was exercised by Brigadier-General Orris Sanford Ferry.

August 7 1864: Lehigh District transferred with the Department of the Susquehanna to the Middle Military Division.

District of the Monongahela

(Established, June 27 1864-August 7 1864, transferred to Middle Military Division)

  • Thomas Algeo Rowley (June 27 1864-August 7 1864)

June 27 1864: District of the Monongahela was established in the Department of the Susquehanna, comprising the state of Pennsylvania west of Laurel Hill and Columbiana, Belmont and Jefferson counties in Ohio. Brigadier-General Thomas Algeo Rowley assumed command of the District of the Monongahela.

August 7 1864: The District of the Monongahela transferred with the Department of the Susquehanna to the Middle Military Division.

District of the Brandywine

(Established, July 31 1864-August 7 1864, transferred to Middle Military Division)

  • George Cadwalader (July 31 1864-August 7 1864)

July 31 1864: The District of Brandywine was established in the Department of the Susquehanna, comprising the territory between the Blue Ridge Mountains and the Susquehanna River and Dauphine, Lancaster, Chester, Delaware, Bucks, Philadelphia and Montgomery counties, Pennsylvania. Major-General George Cadwalader assumed command of the District of Brandywine.

August 7 1864: The District of the Brandywine transferred with the Department of the Susquehanna to the Middle Military Division.


Department of West Virginia

Union High Command on June 24 1863 Eastern and Capital Theatre

  • Middle Department: Robert Cumming Schenck
    • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
    • VIII Corps Middle: Robert Cumming Schenck
  • Department of the Monongahela: William Thomas Harbaugh Brooks
  • Department of the Potomac: Joseph Hooker
    • Army of the Potomac: Joseph Hooker
      • I Corps Potomac: John Fulton Reynolds
      • II Corps Potomac: Winfield Scott Hancock
      • III Corps Potomac: Daniel Edgar Sickles
      • V Corps Potomac: George Gordon Meade
      • VI Corps Potomac: John Sedgwick
      • XI Corps Potomac: Oliver Otis Howard
      • XII Corps Potomac: Henry Warner Slocum
      • Cavalry Corps Potomac: Alfred Pleasonton
  • Department of the Susquehanna: Darius Nash Couch
  • Department of Virginia: Erasmus Darwin Keyes
    • IV Corps Virginia: Erasmus Darwin Keyes
    • VII Corps Virginia: John Adams Dix
  • Department of Washington: Samuel Peter Heintzelman
    • District of Alexandria: John Potts Slough
    • District of Washington: John Henry Martindale
    • XXII Corps Washington: Samuel Peter Heintzelman
  • Department of Western Virginia: Benjamin Franklin Kelley awaited

(Established, June 24 1863-August 7 1864, transferred, to Middle Military Division)

  • Benjamin Franklin Kelley (June 24 1863-February 29 1864 interim March 10 1864)
  • Franz Sigel (February 29 1864-May 19 1864 interim May 24 1864)
  • David Hunter (May 19 1864-July 25 1864 interim August 7 1864)
  • George Crook (July 25 1864-August 7 1864)

June 24 1863: The Department of West Virginia was established, comprising western Virginia south of Ohio County and west of Hancock, Maryland, including the adjacent counties in Ohio. The Ohio counties south of Belmont and neighbouring western Virginia were transferred from the Department of the Ohio to the Department of West Virginia. Brigadier-General Benjamin Franklin Kelley was appointed to command the Department of West Virginia, arriving on 28th June 1863.

June 28 1863: Brigadier-General Benjamin Franklin Kelley arrived to command the Department of West Virginia.

July 2 1863: The Army of the Kanawha was established in the Department of West Virginia.

August 3 1863: The territory of Maryland west of the Monocacy River and the territory around Harper’s Ferry were transferred from the Middle Department and the Department of the Potomac to the Department of West Virginia.

October 12 1863: Hancock, Brooke and Ohio counties in West Virginia were transferred from the Department of the Monongahela to the Department of West Virginia. The counties of Columbiana, Belmont and Jefferson in Ohio were transferred from the Department of the Monongahela to the Department of West Virginia.

January 12 1864: Alton, Illinois. The counties of Hancock, Brooke and Ohio in West Virginia were transferred from the Department of West Virginia to the Northern Department.

February 29 1864: Major-General Franz Sigel was appointed to command the Department of West Virginia arriving on 10th March 1864.

March 10 1864: Major-General Franz Sigel arrived to command the Department of West Virginia.

May 19 1864: Major-General David Hunter was appointed to command the Department of West Virginia, arriving on 21st May 1864, to succeed Major-General Franz Sigel.

May 21 1864: Major-General David Hunter arrived to command the Department of West Virginia, succeeding Major-General Franz Sigel. The Army of the Shenandoah was established in the Department of West Virginia.

May 20 1864: The District of Harper’s Ferry was established in the Department of West Virginia, comprising the line of the Baltimore & Ohio Railroad from Monocacy to Hancock, Maryland.

July 3 1864: The Army of the Shenandoah was discontinued, and part of the forces incorporated into the Army of the Kanawha.

July 25 1864: Brigadier-General George Crook was appointed to temporary command of the Department of West Virginia, arriving on 9th August 1864.

August 7 1864: The Department of West Virginia transferred to the Middle Military Division. The District of Harper’s Ferry transferred with the Department of West Virginia to the Middle Military Division. The Army of the Kanawha transferred with the Department of West Virginia to the Middle Military Division. The Army of the Shenandoah transferred with the Department of West Virginia to the Middle Military Division.

District of Harper’s Ferry

(Established, May 24 1864-August 7 1864, transferred to Middle Military Division)

  • Franz Sigel (May 24 1864-July 7 1864)
  • Albion Parris Howe (July 7 1864-August 7 1864)

May 20 1864: The District of Harper’s Ferry was established in the Department of West Virginia, comprising the line of the Baltimore & Ohio Railroad from Monocacy to Hancock, Maryland. Major-General Franz Sigel assumed command of the District of Harper’s Ferry.

July 7 1864: Brigadier-General Albion Parris Howe assumed command of the District of Harper’s Ferry, succeeding Major-General Franz Sigel.

August 7 1864: The District of Harper’s Ferry transferred with the Department of West Virginia to the Middle Military Division.

Army of the Kanawha

(Established, July 2 1863-August 7 1864, transferred to Middle Military Division)

  • George Crook (July 2 1863-August 7 1864)

July 2 1863: The Army of the Kanawha was established in the Department of West Virginia. Brigadier-General George Crook assumed command of the Army of the Kanawha.

July 3 1864: The Army of the Shenandoah was discontinued, and part of the forces incorporated into the Army of the Kanawha.

August 7 1864: The Army of the Kanawha transferred with the Department of West Virginia to the Middle Military Division.

Army of the Shenandoah

(Established, May 21 1864-July 3 1864, discontinued, to Army of the Kanawha)

  • David Hunter (May 21 1864-July 3 1864)

May 21 1864: The Army of the Shenandoah was established in the Department of West Virginia. Major-General David Hunter assumed command of the Army of the Shenandoah.

July 3 1864: The Army of the Shenandoah was discontinued, and part of the forces incorporated into the Army of the Kanawha.

District of St Mary’s

(Established, July 23 1863-December 2 1863, transferred to Department of Virginia and North Carolina)

  • Gilman Marston (July 23 1863-December 2 1863)

July 23 1863: The District of St Mary’s was established under the War Department, comprising St Mary’s county in Maryland and was detached from the Department of the Potomac. Brigadier-General Gilman Marston assumed command of the District of St Mary’s.

December 2 1863: The District of St Mary’s transferred from the War Department to the Department of Virginia and North Carolina.



Middle Military Division

Union High Command on August 7 1864 Eastern and Capital Theatre

  • Middle Military Division: Philip Henry Sheridan temporary
    • Middle Department: Lewis Wallace
      • District of Delaware: Henry Hayes Lockwood
      • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
      • VIII Corps Middle: Lewis Wallace
    • Department of the Susquehanna: Darius Nash Couch
      • Lehigh District: Franz Sigel
      • District of Brandywine: George Cadwalader
      • District of the Monongahela: Thomas Algeo Rowley
    • Department of Washington: Christopher Columbus Augur
      • District of St Mary’s: James Barnes
      • District of Alexandria: John Potts Slough
      • District of Washington: Moses N Wisewell
      • XXII Corps Washington: Christopher Columbus Augur
    • Department of Western Virginia: David Hunter interim George Crook awaited
      • District of Harper’s Ferry: Albion Parris Howe
      • Army of the Kanawha: George Crook
    • Army of the Shenandoah: Philip Henry Sheridan
      • VI Corps Shenandoah: Horatio Gouverneur Wright
      • Cavalry Corps Shenandoah: Alfred Thomas Archimedes Torbert awaited
  • Department of the Potomac: George Gordon Meade
    • Army of the Potomac: George Gordon Meade
      • II Corps Potomac: Winfield Scott Hancock
      • V Corps Potomac: Gouverneur Kemble Warren
      • IX Corps Potomac: Ambrose Everett Burnside
      • Cavalry Corps Potomac: David McMurtrie Gregg
  • Department of Virginia and North Carolina: Edward Otho Cresap Ord temporary
    • District of Eastern Virginia: George Foster Shepley
    • District of Currituck: Samuel Henry Roberts
    • District of North Carolina: Innis Newton Palmer
      • Sub-District of Beaufort NC: Thomas Jonathan Coffin Amory
      • Sub-District of New Bern: Edward Harland
    • Army of the James: Benjamin Franklin Butler
      • X Corps James: David Bell Birney
      • XVIII Corps James: Edward Otho Cresap Ord

(Established, August 7 1864-June 27 1865, transferred to the Military Division of the Atlantic)

  • Philip Henry Sheridan (August 7 1864-February 27 1865)
  • Winfield Scott Hancock (February 27 1865-February 28 1865)
  • Alfred Thomas Archimedes Torbert (interim February 28 1865)
  • Winfield Scott Hancock (February 28 1865-June 27 1865)

August 7 1864: The Middle Military Division was established, comprising the Department of Washington, the Department of the Susquehanna, the Middle Department and the Department of West Virginia. Major-General Philip Henry Sheridan assumed temporary command of the Middle Military Division. The Middle Department transferred to the Middle Military Division. The Department of the Susquehanna transferred to the Middle Military Division. The Department of Washington transferred to the Middle Military Division. The Department of West Virginia transferred to the Middle Military Division. The District of the Eastern Shore of Maryland transferred with the Middle Department to the Middle Military Division. The District of Delaware transferred with the Middle Department to the Middle Military Division. VIII Corps (Middle) transferred with the Middle Department to the Middle Military Division. The District of Alexandria transferred with the Department of Washington to the Middle Military Division. The District of Washington transferred with the Department of Washington to the Middle Military Division. The District of St Mary’s transferred with the Department of Washington to the Middle Military Division. XXII Corps (Washington) transferred with the Department of Washington to the Middle Military Division. Lehigh District transferred with the Department of the Susquehanna to the Middle Military Division. The District of the Monongahela transferred with the Department of the Susquehanna to the Middle Military Division. The District of the Brandywine transferred with the Department of the Susquehanna to the Middle Military Division. The District of Harper’s Ferry transferred with the Department of West Virginia to the Middle Military Division. The Army of the Kanawha transferred with the Department of West Virginia to the Middle Military Division. The Army of the Shenandoah was established in the Middle Military Division.

August 8 1864: The Army of the Kanawha was discontinued. The Army of West Virginia was established in the Department of West Virginia.

September 21 1864: Major-General Philip Henry Sheridan assumed full command of the Middle Military Division. The Department of the Susquehanna was discontinued, and its territory transferred to the Department of Pennsylvania. The Department of Pennsylvania was established in the Middle Military Division, comprising the state of Pennsylvania and the counties of Columbiana, Belmont and Jefferson counties of Ohio.

February 27 1865: Major-General Winfield Scott Hancock assumed command of the Middle Military Division, succeeding Major-General Philip Henry Sheridan.

February 28 1865: Brigadier-General Alfred Thomas Archimedes Torbert assumed temporary command of the Middle Military Division, interim for Major-General Winfield Scott Hancock. Major-General Winfield Scott Hancock assumed command of the Middle Military Division, succeeding Brigadier-General Alfred Thomas Archimedes Torbert.

March 25 1865: Cavalry Corps (Shenandoah) was discontinued, and is forces incorporated into Sheridan’s Cavalry Command.

May 17 1865: VIII Corps (Middle) transferred from the Middle Department to the direct command of the Middle Military Division.

June 27 1865: The Middle Military Division was discontinued. The Department of Pennsylvania was discontinued, and its territory incorporated into the Middle Department and the Department of the Ohio. The Department of the Potomac was discontinued, and its territory incorporated into the Middle Department. The Military Division of the Atlantic was established, comprising the Department of the East, the Department of Virginia, the Department of North Carolina, the Department of South Carolina, and the Middle Department. The Middle Department transferred to the Military Division of the Atlantic. The Army of the Shenandoah was discontinued. The Department of Washington transferred to the Military Division of the Atlantic. The Department of West Virginia was discontinued, and its territory was incorporated into the Middle Department and the Department of the Ohio. VIII Corps (Middle) transferred to the Military Division of the Atlantic. The District of Washington transferred with the Department of Washington to the Military Division of the Atlantic.


Middle Department

Union High Command on August 7 1864 Eastern and Capital Theatre

  • Middle Military Division: Philip Henry Sheridan temporary
    • Middle Department: Lewis Wallace
      • District of Delaware: Henry Hayes Lockwood
      • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
      • VIII Corps Middle: Lewis Wallace
    • Department of the Susquehanna: Darius Nash Couch
      • Lehigh District: Franz Sigel
      • District of Brandywine: George Cadwalader
      • District of the Monongahela: Thomas Algeo Rowley
    • Department of Washington: Christopher Columbus Augur
      • District of St Mary’s: James Barnes
      • District of Alexandria: John Potts Slough
      • District of Washington: Moses N Wisewell
      • XXII Corps Washington: Christopher Columbus Augur
    • Department of Western Virginia: David Hunter interim George Crook awaited
      • District of Harper’s Ferry: Albion Parris Howe
      • Army of the Kanawha: George Crook
    • Army of the Shenandoah: Philip Henry Sheridan
      • VI Corps Shenandoah: Horatio Gouverneur Wright
      • Cavalry Corps Shenandoah: Alfred Thomas Archimedes Torbert awaited
  • Department of the Potomac: George Gordon Meade
    • Army of the Potomac: George Gordon Meade
      • II Corps Potomac: Winfield Scott Hancock
      • V Corps Potomac: Gouverneur Kemble Warren
      • IX Corps Potomac: Ambrose Everett Burnside
      • Cavalry Corps Potomac: David McMurtrie Gregg
  • Department of Virginia and North Carolina: Edward Otho Cresap Ord temporary
    • District of Eastern Virginia: George Foster Shepley
    • District of Currituck: Samuel Henry Roberts
    • District of North Carolina: Innis Newton Palmer
      • Sub-District of Beaufort NC: Thomas Jonathan Coffin Amory
      • Sub-District of New Bern: Edward Harland
    • Army of the James: Benjamin Franklin Butler
      • X Corps James: David Bell Birney
      • XVIII Corps James: Edward Otho Cresap Ord

(Transferred to Middle Military Division, August 7 1864-June 27 1865, transferred to Military Division of the Atlantic)

  • Lewis Wallace (August 7 1864-February 1 1865)
  • William Walton Morris (temporary February 1 1865-April 19 1865)
  • Lewis Wallace (April 19 1865-June 27 1865)

August 7 1864: The Middle Military Division was established, comprising the Department of Washington, the Department of the Susquehanna, the Middle Department and the Department of West Virginia. The Middle Department transferred to the Middle Military Division. Major-General Lewis Wallace retained command of the Middle Department. The District of the Eastern Shore of Maryland transferred with the Middle Department to the Middle Military Division. The District of Delaware transferred with the Middle Department to the Middle Military Division. VIII Corps (Middle) transferred with the Middle Department to the Middle Military Division.

February 1 1865: Colonel William Walton Morris assumed temporary command of the Middle Department, succeeding Major-General Lewis Wallace.

March 24 1865: The District of Delaware was discontinued, and incorporated into the District of Delaware and the Eastern Shore. The District of the Eastern Shore of Maryland was discontinued, and incorporated into the District of Delaware and the Eastern Shore. The District of Delaware and the Eastern Shore was established in the Middle Department.

April 1 1865: The District of Annapolis was established and transferred to the Middle Department.

April 19 1865: Major-General Lewis Wallace assumed command of the Middle Department, succeeding Colonel William Walton Morris.

May 17 1865: VIII Corps (Middle) transferred from the Middle Department to the direct command of the Middle Military Division.

June 27 1865: The Department of Pennsylvania was discontinued, and its territory incorporated into the Middle Department and the Department of the Ohio. The Department of the Potomac was discontinued, and its territory incorporated into the Middle Department. The Middle Department transferred to the Military Division of the Atlantic. The District of Annapolis transferred with the Middle Department to the Military Division of the Atlantic. The District of Delaware and the Eastern Shore transferred with the Middle Department to the Military Division of the Atlantic. VIII Corps (Middle) transferred from the Middle Military Division to the Military Division of the Atlantic.

District of Delaware

(Transferred to Middle Military Division, August 7 1864-March 24 1865, discontinued, to District of Delaware and the Eastern Shore)

  • Henry Hayes Lockwood (August 7 1864-August 20 1864)
  • Samuel M Bowman (August 20 1864-March 24 1865)

August 7 1864: The District of Delaware transferred with the Middle Department to the Middle Military Division. Brigadier-General Henry Hayes Lockwood retained command of the District of Delaware.

August 20 1864: Colonel Samuel M Bowman assumed command of the District of Delaware, succeeding Brigadier-General Henry Hayes Lockwood.

March 24 1865: The District of Delaware was discontinued, and incorporated into the District of Delaware and the Eastern Shore.

District of the Eastern Shore of Maryland

(Transferred to Middle Military Division, August 7 1864-March 24 1865, discontinued, to District of Delaware and the Eastern Shore)

  • Henry Hayes Lockwood (August 7 17864-January 5 1865)
  • John Reese Kenly (January 5 1865-March 24 1865)

August 7 1864: The District of the Eastern Shore of Maryland transferred with the Middle Department to the Middle Military Division. Brigadier-General Henry Hayes Lockwood retained command of the District of the Eastern Shore of Maryland.

January 5 1865: Brigadier-General John Reese Kenly assumed command of the District of the Eastern Shore of Maryland, succeeding Brigadier-General Henry Hayes Lockwood.

March 24 1865: The District of the Eastern Shore of Maryland was discontinued, and incorporated into the District of Delaware and the Eastern Shore.

District of Delaware and the Eastern Shore

(Established, from District of Delaware and District of the Eastern Shore of Maryland, March 24 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • John Reese Kenly (March 24 1865-June 5 1865)
  • John Moulder Wilson (June 5 1865-June 27 1865)

March 24 1865: The District of Delaware was discontinued, and incorporated into the District of Delaware and the Eastern Shore. The District of the Eastern Shore of Maryland was discontinued, and incorporated into the District of Delaware and the Eastern Shore. The District of Delaware and the Eastern Shore was established in the Middle Department. It included the territory formerly in the District of Delaware and the District of the Eastern Shore of Maryland. Brigadier-General John Reese Kenly assumed command of the District of Delaware and the Eastern Shore.

June 5 1865: Lieutenant-Colonel USV John Moulder Wilson assumed temporary command of the District of Delaware and the Eastern Shore, succeeding Brigadier-General John Reese Kenly.

June 27 1865: The District of Delaware and the Eastern Shore transferred with the Middle Department to the Military Division of the Atlantic.

District of Annapolis

(Established, April 1 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Frederic Dummer Sewall (April 1 1865-June 27 1865)

April 1 1865: The District of Annapolis was established and transferred to the Middle Department. It comprised the territory around Annapolis, Maryland, and Camp Parole. Colonel Frederic Dummer Sewall assumed command of the District of Annapolis.

June 27 1865: The District of Annapolis transferred with the Middle Department to the Military Division of the Atlantic.

VIII Corps Middle

(Transferred to Middle Military Division, August 7 1864-May 17 1865, transferred to Middle Military Division)

  • Lewis Wallace (August 7 1864-February 1 1865)
  • William Walton Morris (temporary February 1 1865-April 19 1865)
  • Lewis Wallace (April 19 1865-May 17 1865)

August 7 1864: VIII Corps (Middle) transferred with the Middle Department to the Middle Military Division. Major-General Lewis Wallace retained command VIII Corps (Middle).

February 1 1865: Colonel William Walton Morris assumed temporary command of VIII Corps (Middle), succeeding Major-General Lewis Wallace.

April 19 1865: Major-General Lewis Wallace assumed command of VIII Corps (Middle), succeeding Colonel William Walton Morris.

May 17 1865: VIII Corps (Middle) transferred from the Middle Department to the direct command of the Middle Military Division.


Department of Washington

Union High Command on August 7 1864 Eastern and Capital Theatre

  • Middle Military Division: Philip Henry Sheridan temporary
    • Middle Department: Lewis Wallace
      • District of Delaware: Henry Hayes Lockwood
      • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
      • VIII Corps Middle: Lewis Wallace
    • Department of the Susquehanna: Darius Nash Couch
      • Lehigh District: Franz Sigel
      • District of Brandywine: George Cadwalader
      • District of the Monongahela: Thomas Algeo Rowley
    • Department of Washington: Christopher Columbus Augur
      • District of St Mary’s: James Barnes
      • District of Alexandria: John Potts Slough
      • District of Washington: Moses N Wisewell
      • XXII Corps Washington: Christopher Columbus Augur
    • Department of Western Virginia: David Hunter interim George Crook awaited
      • District of Harper’s Ferry: Albion Parris Howe
      • Army of the Kanawha: George Crook
    • Army of the Shenandoah: Philip Henry Sheridan
      • VI Corps Shenandoah: Horatio Gouverneur Wright
      • Cavalry Corps Shenandoah: Alfred Thomas Archimedes Torbert awaited
  • Department of the Potomac: George Gordon Meade
    • Army of the Potomac: George Gordon Meade
      • II Corps Potomac: Winfield Scott Hancock
      • V Corps Potomac: Gouverneur Kemble Warren
      • IX Corps Potomac: Ambrose Everett Burnside
      • Cavalry Corps Potomac: David McMurtrie Gregg
  • Department of Virginia and North Carolina: Edward Otho Cresap Ord temporary
    • District of Eastern Virginia: George Foster Shepley
    • District of Currituck: Samuel Henry Roberts
    • District of North Carolina: Innis Newton Palmer
      • Sub-District of Beaufort NC: Thomas Jonathan Coffin Amory
      • Sub-District of New Bern: Edward Harland
    • Army of the James: Benjamin Franklin Butler
      • X Corps James: David Bell Birney
      • XVIII Corps James: Edward Otho Cresap Ord

(Transferred to Middle Military Division, August 7 1864-June 27 1865, transferred to Military Division of the Atlantic)

  • Christopher Columbus Augur (August 7 1864-June 7 1865)
  • John Grubb Parke (temporary June 7 1865-June 26 1865)
  • Christopher Columbus Augur (June 26 1865-June 27 1865)

August 7 1864: The Department of Washington transferred to the Middle Military Division. Major-General Christopher Columbus Augur retained command of the Department of Washington. The District of Alexandria transferred with the Department of Washington to the Middle Military Division. The District of Washington transferred with the Department of Washington to the Middle Military Division. The District of St Mary’s transferred with the Department of Washington to the Middle Military Division. XXII Corps (Washington) transferred with the Department of Washington to the Middle Military Division.

April 24 1865: IX Corps (Potomac) transferred from the Army of the Potomac to the Department of Washington.

April 26 1865: The District of Patuxent was established in the Department of Washington. The District of the Northern Neck was established in the Department of Washington. The District of Washington was reorganised to include the part of the Department of Washington north of the Potomac River except the city of Washington and the territory between the Potomac and Patuxent Rivers south of the Piscataway River.

May 18 1865: The District of the Northern Neck was discontinued, and its territory transferred to the District of Washington. The District of Patuxent was discontinued.

June 7 1865: Major-General John Grubb Parke assumed temporary command of the Department of Washington., succeeding Major-General Christopher Columbus Augur.

June 26 1865: Major-General Christopher Columbus Augur assumed command of the Department of Washington, succeeding Major-General John Grubb Parke. XXII Corps (Washington) was discontinued.

June 27 1865: The Department of Washington transferred from the discontinued Middle Military Division to the Military Division of the Atlantic. The District of Alexandria transferred with the Department of Washington to the Military Division of the Atlantic. The District of Washington transferred with the Department of Washington to the Military Division of the Atlantic. IX Corps (Washington) transferred with the Department of Washington to the Military Division of the Atlantic.

District of Alexandria

(Transferred to Middle Military Division, August 7 1864-June 27 1865, to Military Division of the Atlantic)

  • John Potts Slough (August 7 1864-November 21 1864)
  • Henry Horatio Wells (temporary November 21 1864-January 1 1865)
  • John Potts Slough (January 1 1865-April 26 1865)
  • John Grubb Parke (April 26 1865-June 7 1865)
  • John Potts Slough (June 7 1865-June 27 1865)

August 7 1864: The District of Alexandria transferred with the Department of Washington to the Middle Military Division. Brigadier-General John Potts Slough retained command of the District of Alexandria.

November 21 1864: Colonel Henry Horatio Wells assumed temporary command of the District of Alexandria, succeeding Brigadier-General John Potts Slough.

January 1 1865: Brigadier-General John Potts Slough assumed command of the District of Alexandria, succeeding Colonel Henry Horatio Wells.

April 26 1865: Major-General John Grubb Parke assumed command of the District of Alexandria, succeeding Brigadier-General John Potts Slough.

June 7 1865: Brigadier-General John Potts Slough assumed command of the District of Alexandria, succeeding Major-General John Grubb Parke.

June 27 1865: The District of Alexandria transferred with the Department of Washington to the Military Division of the Atlantic.

District of Washington

(Transferred to Middle Military Division, August 7 1864-June 27 1865, transferred to Military Division of the Atlantic)

  • Moses N Wisewell (August 7 1864-April 26 1865)
  • Orlando Bolivar Willcox (April 26 1865-June 27 1865)

August 7 1864: The District of Washington transferred with the Department of Washington to the Middle Military Division. Colonel Moses N Wisewell retained command of the District of Washington.

April 26 1865: The District of Washington was reorganised to include the part of the Department of Washington north of the Potomac River except the city of Washington and the territory between the Potomac and Patuxent Rivers south of the Piscataway River. Brigadier-General Orlando Bolivar Willcox assumed command of the District of Washington, succeeding Colonel Moses N Wisewell.

May 18 1865: The District of the Northern Neck was discontinued, and its territory transferred to the District of Washington.

June 27 1865: The District of Washington transferred with the Department of Washington to the Military Division of the Atlantic.

District of St Mary’s

(Transferred to Middle Military Division, August 7 1864-April 26 1865, discontinued)

  • James Barnes (August 7 1864-April 26 1865)

August 7 1864: The District of St Mary’s transferred with the Department of Washington to the Middle Military Division. Brigadier-General James Barnes retained command of the District of St Mary’s.

April 26 1865: The District of St Mary’s was discontinued.

District of Patuxent

(Established, April 26 1865-May 18 1865, discontinued)

  • Henry Horatio Wells (April 26 1865-May 18 1865)

April 26 1865: The District of Patuxent was established in the Department of Washington. It comprised the territory between the Potomac and Patuxent of Piscataway Creek. Colonel Henry Horatio Wells assumed command of the District of Patuxent.

May 18 1865: The District of Patuxent was discontinued.

District of the Northern Neck

(Established, April 26 1865-May 18 1865, discontinued, to District of Washington)

  • Nelson Bowman Sweitzer (April 26 1865-May 18 1865)

April 26 1865: The District of the Northern Neck was established in the Department of Washington. It comprised the territory between the Potomac and Rappahannock rivers and south of the Fredericksburg & Aquia Railroad. Colonel Nelson Bowman Sweitzer assumed command of District of the Northern Neck.

May 18 1865: The District of the Northern Neck was discontinued. Its territory transferred to the District of Washington.

XXII Corps Washington

(Transferred to Middle Military Division, August 7 1864-June 26 1865, discontinued)

  • Christopher Columbus Augur (August 7 1864-April 26 1865)
  • John Grubb Parke (April 26 1865-June 26 1865)

August 7 1864: XXII Corps (Washington) transferred with the Department of Washington to the Middle Military Division. Major-General Christopher Columbus Augur retained command of XXII Corps (Washington).

April 26 1865: Major-General John Grubb Parke assumed command of XXII Corps (Washington), succeeding Major-General Christopher Columbus Augur.

June 26 1865: XXII Corps (Washington) was discontinued.

IX Corps Washington

(Transferred from Army of the Potomac, April 24 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • John Grubb Parke (April 24 1865-June 7 1865)
  • Orlando Bolivar Willcox (temporary June 7 1865-June 26 1865)
  • John Grubb Parke (June 26 1865-June 27 1865)

April 24 1865: IX Corps (Potomac) transferred from the Army of the Potomac to the Department of Washington. Major-General John Grubb Parke retained command of IX Corps (Washington).

June 7 1865: Brigadier-General Orlando Bolivar Willcox assumed temporary command of IX Corps (Washington), succeeding Major-General John Grubb Parke.

June 26 1865: Major-General John Grubb Parke assumed command of IX Corps (Washington), succeeding Brigadier-General Orlando Bolivar Willcox.

June 27 1865: IX Corps (Washington) transferred with the Department of Washington to the Military Division of the Atlantic.


Department of the Susquehanna

Union High Command on August 7 1864 Eastern and Capital Theatre

  • Middle Military Division: Philip Henry Sheridan temporary
    • Middle Department: Lewis Wallace
      • District of Delaware: Henry Hayes Lockwood
      • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
      • VIII Corps Middle: Lewis Wallace
    • Department of the Susquehanna: Darius Nash Couch
      • Lehigh District: Franz Sigel
      • District of Brandywine: George Cadwalader
      • District of the Monongahela: Thomas Algeo Rowley
    • Department of Washington: Christopher Columbus Augur
      • District of St Mary’s: James Barnes
      • District of Alexandria: John Potts Slough
      • District of Washington: Moses N Wisewell
      • XXII Corps Washington: Christopher Columbus Augur
    • Department of Western Virginia: David Hunter interim George Crook awaited
      • District of Harper’s Ferry: Albion Parris Howe
      • Army of the Kanawha: George Crook
    • Army of the Shenandoah: Philip Henry Sheridan
      • VI Corps Shenandoah: Horatio Gouverneur Wright
      • Cavalry Corps Shenandoah: Alfred Thomas Archimedes Torbert awaited
  • Department of the Potomac: George Gordon Meade
    • Army of the Potomac: George Gordon Meade
      • II Corps Potomac: Winfield Scott Hancock
      • V Corps Potomac: Gouverneur Kemble Warren
      • IX Corps Potomac: Ambrose Everett Burnside
      • Cavalry Corps Potomac: David McMurtrie Gregg
  • Department of Virginia and North Carolina: Edward Otho Cresap Ord temporary
    • District of Eastern Virginia: George Foster Shepley
    • District of Currituck: Samuel Henry Roberts
    • District of North Carolina: Innis Newton Palmer
      • Sub-District of Beaufort NC: Thomas Jonathan Coffin Amory
      • Sub-District of New Bern: Edward Harland
    • Army of the James: Benjamin Franklin Butler
      • X Corps James: David Bell Birney
      • XVIII Corps James: Edward Otho Cresap Ord

(Transferred to Middle Military Division, August 7 1864-December 1 1864, discontinued, to Department of Pennsylvania)

  • Darius Nash Couch (August 7 1864-December 1 1864)

August 7 1864: The Department of the Susquehanna transferred to the Middle Military Division. Major-General Darius Nash Couch retained command of the Department of the Susquehanna. The District of the Monongahela transferred with the Department of the Susquehanna to the Middle Military Division. The District of the Brandywine transferred with the Department of the Susquehanna to the Middle Military Division. Lehigh District transferred with the Department of the Susquehanna to the Middle Military Division.

August 18 1864: The District of Brandywine was discontinued.

September 6 1864: Juniata District was established in the Department of the Susquehanna, comprising the line of the Williamsport & Elmira Railroad, along the Susquehanna River to the Blue Ridge Mountains and the Maryland State Line; Adams, Cumberland, Franklin and York counties and the Laurel Hill mountains extending north to Johnstown.

December 1 1864: The Department of the Susquehanna was discontinued, and its territory transferred to the Department of Pennsylvania. The District of the Monongahela transferred from the Department of the Susquehanna to the Department of Pennsylvania. Juniata District transferred from the Department of the Susquehanna to the Department of Pennsylvania. Lehigh District was discontinued.

District of the Monongahela

(Transferred to Middle Military Division, August 7 1864-December 1 1864, transferred to Department of Pennsylvania)

  • Thomas Algeo Rowley (August 7 1864-December 1 1864)

August 7 1864: The District of the Monongahela transferred with the Department of the Susquehanna to the Middle Military Division. Brigadier-General Thomas Algeo Rowley retained command of the District of the Monongahela.

December 1 1864: The District of the Monongahela transferred from the Department of the Susquehanna to the Department of Pennsylvania.

District of the Brandywine

(Transferred to Middle Military Division, August 7 1864-August 18 1864, discontinued)

  • George Cadwalader (August 7 1864-August 18 1864)

August 7 1864: The District of the Brandywine transferred with the Department of the Susquehanna to the Middle Military Division. Major-General George Cadwalader retained command of the District of Brandywine.

August 18 1864: The District of Brandywine was discontinued.

Lehigh District

(Transferred to Middle Military Division, August 7 1864-December 1 1864, discontinued)

  • Franz Sigel (August 7 1864-November 9 1864)
  • Thomas Scott Mather (November 9 1864-December 1 1864)

August 7 1864: Lehigh District transferred with the Department of the Susquehanna to the Middle Military Division. Major-General Franz Sigel retained command of Lehigh District.

November 9 1864: Colonel Thomas Scott Mather assumed command of Lehigh District, succeeding Major-General Franz Sigel.

December 1 1864: Lehigh District was discontinued.

Juniata District

(Established, September 6 1864-December 1 1864, transferred to Department of Pennsylvania)

  • Orris Sanford Ferry (September 6 1864-December 1 1864)

September 6 1864: Juniata District was established in the Department of the Susquehanna, comprising the line of the Williamsport & Elmira Railroad, along the Susquehanna River to the Blue Ridge Mountains and the Maryland State Line; Adams, Cumberland, Franklin and York counties and the Laurel Hill mountains extending north to Johnstown. Brigadier-General Orris Sanford Ferry assumed command of Juniata District.

December 1 1864: Juniata District transferred from the Department of the Susquehanna to the Department of Pennsylvania.


Department of West Virginia

Union High Command on August 7 1864 Eastern and Capital Theatre

  • Middle Military Division: Philip Henry Sheridan temporary
    • Middle Department: Lewis Wallace
      • District of Delaware: Henry Hayes Lockwood
      • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
      • VIII Corps Middle: Lewis Wallace
    • Department of the Susquehanna: Darius Nash Couch
      • Lehigh District: Franz Sigel
      • District of Brandywine: George Cadwalader
      • District of the Monongahela: Thomas Algeo Rowley
    • Department of Washington: Christopher Columbus Augur
      • District of St Mary’s: James Barnes
      • District of Alexandria: John Potts Slough
      • District of Washington: Moses N Wisewell
      • XXII Corps Washington: Christopher Columbus Augur
    • Department of Western Virginia: David Hunter interim George Crook awaited
      • District of Harper’s Ferry: Albion Parris Howe
      • Army of the Kanawha: George Crook
    • Army of the Shenandoah: Philip Henry Sheridan
      • VI Corps Shenandoah: Horatio Gouverneur Wright
      • Cavalry Corps Shenandoah: Alfred Thomas Archimedes Torbert awaited
  • Department of the Potomac: George Gordon Meade
    • Army of the Potomac: George Gordon Meade
      • II Corps Potomac: Winfield Scott Hancock
      • V Corps Potomac: Gouverneur Kemble Warren
      • IX Corps Potomac: Ambrose Everett Burnside
      • Cavalry Corps Potomac: David McMurtrie Gregg
  • Department of Virginia and North Carolina: Edward Otho Cresap Ord temporary
    • District of Eastern Virginia: George Foster Shepley
    • District of Currituck: Samuel Henry Roberts
    • District of North Carolina: Innis Newton Palmer
      • Sub-District of Beaufort NC: Thomas Jonathan Coffin Amory
      • Sub-District of New Bern: Edward Harland
    • Army of the James: Benjamin Franklin Butler
      • X Corps James: David Bell Birney
      • XVIII Corps James: Edward Otho Cresap Ord

(Transferred to Middle Military Division, August 7 1864-June 27 1865, discontinued, to Middle Department and Department of the Ohio)

  • David Hunter (interim August 7 1864-August 8 1864)
  • Julius Stahel (interim August 8 1864-August 9 1864)
  • George Crook (temporary August 7 1864-September 1 1864, September 1 1864-February 21 1865)
  • John Dunlap Stevenson (temporary February 21 1865-February 26 1865 interim February 27 1865)
  • Samuel Sprigg Carroll (interim February 27 1865-February 28 1865)
  • Winfield Scott Hancock (February 26 1865-February 28 1865 interim March 1 1865)
  • Samuel Sprigg Carroll (temporary February 28 1865-March 7 1865)
  • Winfield Scott Hancock (March 7 1865-March 19 1865)
  • George Crook (temporary March 19 1865-March 22 1865)
  • Winfield Scott Hancock (March 22 1865-April 22 1865 interim April 24 1865)
  • William Hemsley Emory (temporary April 24 1865-June 27 1865)

August 7 1864: The Department of West Virginia transferred to the Middle Military Division. Major-General David Hunter retained interim command of the Department of West Virginia pending the arrival of Brigadier-General George Crook. The District of Harper’s Ferry transferred with the Department of West Virginia to the Middle Military Division. The Army of the Kanawha transferred with the Department of West Virginia to the Middle Military Division.

August 8 1864: Major-General Julius Stahel assumed interim command of the Department of West Virginia, succeeding Major-General David Hunter, pending the arrival of Brigadier-General George Crook. The Army of the Kanawha was discontinued, and its forces transferred to the Army of West Virginia. The Army of West Virginia was established in the Department of West Virginia.

August 9 1864: Brigadier-General George Crook arrived to temporary command of the Department of West Virginia, succeeding Major-General Julius Stahel.

August 30 1864: Brigadier-General George Crook assumed full command of the Department of West Virginia, arriving on 1st September 1864.

September 1 1864: Brigadier-General George Crook arrived to full command of the Department of West Virginia.

December 19 1864: The Army of West Virginia was discontinued.

February 21 1865: Brigadier-General John Dunlap Stevenson assumed temporary command of the Department of West Virginia, succeeding Major-General George Crook.

February 25 1865: The District of Harper’s Ferry was discontinued.

February 26 1865: Major-General Winfield Scott Hancock was appointed to command the Department of West Virginia, arriving on 28th February 1865, to succeed Brigadier-General John Dunlap Stevenson.

February 27 1865: Brigadier-General Samuel Sprigg Carroll assumed interim command of the Department of West Virginia, succeeding Brigadier-General John Dunlap Stevenson interim pending the arrival of Major-General Winfield Scott Hancock.

February 28 1865: Major-General Winfield Scott Hancock arrived to assume command of the Department of West Virginia, but proceeded on to assume command of the Middle Military Division and delegated the Department to Brigadier-General Samuel Sprigg Carroll. Brigadier-General Samuel Sprigg Carroll assumed temporary command of the Department of West Virginia, arriving on 1stMarch 1865, after a period of interim command.

March 1 1865: Brigadier-General Samuel Sprigg Carroll arrived to temporary command the Department of West Virginia, succeeding Major-General Winfield Scott Hancock.

March 7 1865: Major-General Winfield Scott Hancock assumed command of the Department of West Virginia, succeeding Brigadier-General Samuel Sprigg Carroll.

March 19 1865: Major-General George Crook assumed temporary command of the Department of West Virginia, succeeding Major-General Winfield Scott Hancock.

March 22 1865: Major-General Winfield Scott Hancock assumed command of the Department of West Virginia, succeeding Major-General George Crook.

April 22 1865: Brigadier-General William Hemsley Emory was appointed to temporary command of the Department of West Virginia, arriving on 24th April 1865, to succeed Major-General William Scott Hancock.

April 24 1865: Brigadier-General William Hemsley Emory arrived to temporary command of the Department of West Virginia, succeeding Major-General Winfield Scott Hancock.

June 27 1865: The Department of West Virginia was discontinued, and its territory was incorporated into the Middle Department and the Department of the Ohio.

District of Harper’s Ferry

(Transferred to Middle Military Division, August 7 1864-February 25 1865, discontinued)

  • Albion Parris Howe (August 7 1864-August 8 1864)
  • Max Weber (August 8 1864-August 15 1864)
  • John Dunlap Stevenson (August 15 1864-February 21 1865)
  • William Henry Seward (February 21 1865-February 25 1865)

August 7 1864: The District of Harper’s Ferry transferred with the Department of West Virginia to the Middle Military Division. Brigadier-General Albion Parris Howe retained command of the District of Harper’s Ferry.

August 8 1864: Brigadier-General Max Weber assumed command of the District of Harper’s Ferry, succeeding Brigadier-General Albion Parris Howe.

August 15 1864: Brigadier-General John Dunlap Stevenson assumed command of the District of Harper’s Ferry, succeeding Brigadier-General Max Weber.

February 21 1865: Brigadier-General William Henry Seward assumed command of the District of Harper’s Ferry, succeeding Brigadier-General John Dunlap Stevenson.

February 25 1865: The District of Harper’s Ferry was discontinued.

Army of the Kanawha

(Transferred to Middle Military Division, August 7 1864-August 8 1864, discontinued, to Army of West Virginia)

  • George Crook (August 7 1864-August 8 1864)

August 7 1864: The Army of the Kanawha transferred with the Department of West Virginia to the Middle Military Division. Brigadier-General George Crook retained command of the Army of the Kanawha.

August 8 1864: The Army of the Kanawha was discontinued, and its forces transferred to the Army of West Virginia.

Army of West Virginia

(Established, August 8 1864-December 19 1864, discontinued)

  • George Crook (August 8 1864-December 19 1864)

August 8 1864: The Army of the Kanawha was discontinued, and its forces transferred to the Army of West Virginia. The Army of West Virginia was established in the Department of West Virginia. Brigadier-General George Crook assumed command of the Army of West Virginia.

December 19 1864: The Army of West Virginia was discontinued.


Department of Pennsylvania

Union High Command on December 1 1864 Eastern and Capital Theatre

  • Middle Military Division: Philip Henry Sheridan
    • Middle Department: Lewis Wallace
      • District of Delaware: Samuel M Bowman
      • District of the Eastern Shore of Maryland: Henry Hayes Lockwood
      • VIII Corps Middle: Lewis Wallace
    • Department of Pennsylvania: George Cadwalader
      • District of Philadelphia: George Cadwalader
      • District of the Monongahela: Thomas Algeo Rowley
      • Juniata District: Orris Sanford Ferry
    • Department of Washington: Christopher Columbus Augur
      • District of St Mary’s: James Barnes
      • District of Alexandria: Henry Horatio Wells temporary
      • District of Washington: Moses N Wisewell
      • XXII Corps Washington: Christopher Columbus Augur
    • Department of Western Virginia: George Crook
      • District of Harper’s Ferry: John Dunlap Stevenson
      • Army of Western Virginia: George Crook
    • Army of the Shenandoah: Philip Henry Sheridan
      • VI Corps Shenandoah: Horatio Gouverneur Wright
      • XIX Corps Shenandoah: Cuvier Grover
      • Cavalry Corps Shenandoah: Alfred Thomas Archimedes Torbert
  • Department of the Potomac: George Gordon Meade
    • Army of the Potomac: George Gordon Meade
      • II Corps Potomac: Andrew Atkinson Humphreys
      • V Corps Potomac: Gouverneur Kemble Warren
      • IX Corps Potomac: John Grubb Parke
      • Cavalry Corps Potomac: David McMurtrie Gregg
  • Department of Virginia and North Carolina: Benjamin Franklin Butler
    • District of Eastern Virginia: George Foster Shepley
    • District of Currituck: Samuel Henry Roberts
    • Sub-District of Beaufort NC: James Stewart
    • Sub-District of New Bern: Edward Harland
    • Army of the James: Benjamin Franklin Butler
      • X Corps James: Alfred Howe Terry
      • XVIII Corps James: Godfrey Weitzel

(Established, December 1 1864-June 27 1865)

  • George Cadwalader (December 1 1864-June 27 1865)

December 1 1864: The Department of Pennsylvania was established in the Middle Military Division, comprising the state of Pennsylvania and the counties of Columbiana, Belmont and Jefferson counties of Ohio. The Department of the Susquehanna was discontinued, and its territory transferred to the Department of Pennsylvania. Major-General George Cadwalader assumed command of the Department of Pennsylvania. The District of Philadelphia was established in the Department of Pennsylvania. The District of the Monongahela transferred from the Department of the Susquehanna to the Department of Pennsylvania.

June 15 1865: The District of Philadelphia was discontinued.

June 27 1865: The Department of Pennsylvania was discontinued, and its territory incorporated into the Middle Department and the Department of the Ohio. Juniata District was discontinued. The District of the Monongahela was discontinued.

District of Philadelphia

(Established, December 1 1864-June 15 1865, discontinued)

  • George Cadwalader (December 1 1864-December 16 1864)
  • Orris Sanford Ferry (December 16 1864-June 15 1865)

December 1 1864: The District of Philadelphia was established in the Department of Pennsylvania. It comprised Philadelphia and the counties of Bucks, Chester, Delaware and Montgomery counties of Pennsylvania. Major-General George Cadwalader assumed command of the District of Philadelphia.

December 16 1864: Brigadier-General Orris Sanford Ferry assumed command of the District of Philadelphia, succeeding Major-General George Cadwalader.

June 15 1865: The District of Philadelphia was discontinued.

District of the Monongahela

(Transferred from Department of the Susquehanna, December 1 1864-June 27 1865, discontinued)

  • Thomas Algeo Rowley (December 1 1864-December 29 1864)
  • Greenlief P Davis (December 29 1864-June 27 1865)

December 1 1864: The District of the Monongahela transferred from the Department of the Susquehanna to the Department of Pennsylvania. It consisted of the state of Pennsylvania west of laurel Hill and the counties of Columbiana, Belmont and Jefferson in Ohio. Brigadier-General Thomas Algeo Rowley retained command of the District of the Monongahela.

December 29 1864: Captain USV Greenlief P Davis assumed command of the District of the Monongahela, succeeding Brigadier-General Thomas Algeo Rowley.

June 27 1865: The District of the Monongahela was discontinued.

Juniata District

(Transferred from Department of the Susquehanna, December 1 1864-June 27 1865, discontinued)

  • Orris Sanford Ferry (December 1 1864-December 16 1864)
  • Charles Hale Morgan (December 16 1864-June 27 1865)

December 1 1864: Juniata District transferred from the Department of the Susquehanna to the Department of Pennsylvania. Brigadier-General Orris Sanford Ferry retained command of Juniata District.

December 16 1864: Lieutenant-Colonel USA Charles Hale Morgan assumed command of Juniata District, succeeding Brigadier-General Orris Sanford Ferry.

June 27 1865: Juniata District was discontinued.

Army of the Shenandoah

(Established, August 7 1864-June 27 1865, discontinued)

  • Philip Henry Sheridan (August 7 1864-October 16 1864)
  • Horatio Gouverneur Wright (temporary October 16 1864-October 19 1864)
  • Philip Henry Sheridan (October 19 1864-March 7 1865)
  • Winfield Scott Hancock (March 7 1865-April 19 1865)
  • Alfred Thomas Archimedes Torbert (April 19 1865-June 27 1865)

August 7 1864: The Army of the Shenandoah was established in the Middle Military Division. Major-General Philip Henry Sheridan assumed command of the Army of the Shenandoah. Cavalry Corps (Shenandoah) was established in the Army of the Shenandoah. VI Corps (Potomac) transferred from the Army of the Potomac to the Army of the Shenandoah.

October 16 1864: Major-General Horatio Gouverneur Wright assumed temporary command of the Army of the Shenandoah, succeeding Major-General Philip Henry Sheridan.

October 19 1864: Major-General Philip Henry Sheridan assumed command of the Army of the Shenandoah, succeeding Major-General Henry Gouverneur Wright.

November 7 1864: XIX Corps (Shenandoah) was established in the Army of the Shenandoah. The elements of 1st Division and 2nd Division, known as ‘Detachment XIX Corps’ while serving in the Shenandoah Valley were designated XIX Corps (Shenandoah) while the 1st Division retained the interim title of XIX Corps (Gulf).

December 6 1864: VI Corps transferred from the Army of the Shenandoah to the Army of the Potomac.

March 7 1865: Major-General Winfield Scott Hancock assumed command of the Army of the Shenandoah, succeeding Major-General Philip Henry Sheridan.

March 20 1865: XIX Corps (Shenandoah) was discontinued.

March 25 1865: Cavalry Corps (Shenandoah) was discontinued, and is forces incorporated into Sheridan’s Cavalry Command.

March 26 1865: Sheridan’s Cavalry Command was established in the Department of the Potomac. It comprised the combined cavalry forces of the Army of the Potomac, the Army of the James and the Army of the Shenandoah.

April 19 1865: Brigadier-General Alfred Thomas Archimedes Torbert assumed command of the Army of the Shenandoah, succeeding Major-General Winfield Scott Hancock.

June 27 1865: The Army of the Shenandoah was discontinued.

VI Corps Shenandoah

(Transferred from Army of the Potomac, August 7 1864-December 6 1864, transferred to Army of the Potomac)

  • Horatio Gouverneur Wright (August 7 1864-October 16 1864)
  • James Brewerton Ricketts (temporary October 16 1864-October 19 1864)
  • George Washington Getty (interim October 19 1864)
  • Horatio Gouverneur Wright (October 19 1864-December 6 1864)

August 7 1864: VI Corps (Potomac) transferred from the Army of the Potomac to the Army of the Shenandoah. Major-General Horatio Gouverneur Wright retained command of VI Corps (Shenandoah).

October 16 1864: Brigadier-General James Brewerton Ricketts assumed temporary command of VI Corps (Shenandoah), succeeding Major-General Horatio Gouverneur Wright.

October 19 1864: Brigadier-General George Washington Getty assumed interim command of VI Corps (Shenandoah), succeeding Brigadier-General James Brewerton Ricketts. Major-General Horatio Gouverneur Wright assumed command of VI Corps (Shenandoah), succeeding Brigadier-General George Washington Getty.

December 6 1864: VI Corps (Shenandoah) transferred from the Army of the Shenandoah to the Army of the Potomac.

Cavalry Corps Shenandoah

(Established, August 7 1864-March 25 1865, discontinued, to Sheridan’s Cavalry Command)

  • Alfred Thomas Archimedes Torbert (August 7 1864-January 26 1865)
  • Wesley Merritt (January 26 1865-March 25 1865)

August 7 1864: Cavalry Corps was established in the Army of the Shenandoah. Brigadier-General Alfred Thomas Archimedes Torbert was appointed to command Cavalry Corps (Shenandoah), arriving on August 10th 1864.

August 10 1864: Brigadier-General Alfred Thomas Archimedes Torbert arrived to command Cavalry Corps (Shenandoah).

January 26 1865: Brigadier-General Wesley Merritt assumed command of Cavalry Corps (Shenandoah), succeeding Brigadier-General Alfred Thomas Archimedes Torbert.

March 25 1865: Cavalry Corps (Shenandoah) was discontinued, and is forces incorporated into Sheridan’s Cavalry Command.

XIX Corps Shenandoah

(Transferred from Army of the Gulf, November 7 1864-March 20 1865, discontinued)

  • Cuvier Grover (November 7 1864-December 28 1864)
  • William Hemsley Emory (December 28 1864-March 20 1865)

November 7 1864: XIX Corps (Shenandoah) was established in the Army of the Shenandoah. Brigadier-General Cuvier Grover was appointed to command XIX Corps (Shenandoah), arriving on 11th November 1864.The elements of 1st Division and 2nd Division known as ‘Detachment XIX Corps (Gulf)’ were designated XIX Corps (Shenandoah). The 3rd Division remained in Louisiana with the interim title XIX Corps (Gulf).

November 11 1864: Brigadier-General Cuvier Grover arrived to command XIX Corps (Shenandoah).

December 28 1864: Brigadier-General William Hemsley Emory assumed command of XIX Corps (Shenandoah), succeeding Brigadier-General Cuvier Grover.

March 20 1865: XIX Corps (Shenandoah) was discontinued.

VIII Corps Middle

(Transferred from Middle Department, May 17 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Lewis Wallace (May 17 1865-June 27 1865)

May 17 1865: VIII Corps (Middle) transferred from the Middle Department to the direct command of the Middle Military Division. Major-General Lewis Wallace retained command of VIII Corps Middle.

June 27 1865: VIII Corps (Middle) transferred from the Middle Military Division to the Military Division of the Atlantic.


Department of Virginia

Union High Command on January 18 1865 Eastern and Capital Theatre

  • Middle Military Division: Philip Henry Sheridan
    • Middle Department: Lewis Wallace
      • District of Delaware: Samuel M Bowman
      • District of the Eastern Shore of Maryland: John Reese Kenly
      • VIII Corps Middle: Lewis Wallace
    • Department of Pennsylvania: George Cadwalader
      • District of Philadelphia: Orris Sanford Ferry
      • District of the Monongahela: Greenlief P Davis
      • Juniata District: Charles Hale Morgan
    • Department of Washington: Christopher Columbus Augur
      • District of St Mary’s: James Barnes
      • District of Alexandria: John Potts Slough
      • District of Washington: Moses N Wisewell
      • XXII Corps Washington: Christopher Columbus Augur
    • Department of Western Virginia: George Crook
      • District of Harper’s Ferry: John Dunlap Stevenson
    • Army of the Shenandoah: Philip Henry Sheridan
      • XIX Corps Shenandoah: William Hemsley Emory
      • Cavalry Corps Shenandoah: Alfred Thomas Archimedes Torbert
  • Department of the Potomac: George Gordon Meade
    • Army of the Potomac: George Gordon Meade
      • II Corps Potomac: Andrew Atkinson Humphreys
      • V Corps Potomac: Samuel Wylie Crawford temporary
      • VI Corps Potomac: George Washington Getty temporary
      • IX Corps Potomac: John Grubb Parke
      • Cavalry Corps Potomac: David McMurtrie Gregg
  • Department of Virginia: Edward Otho Cresap Ord awaited
    • District of Eastern Virginia: George Foster Shepley
    • Sub-District of Beaufort NC: James Stewart
    • Sub-District of New Bern: Edward Harland
    • Terry’s Provisional Corps Virginia and North Carolina: Alfred Howe Terry
    • Army of the James: Edward Otho Cresap Ord
      • XXIV Corps James: John Gibbon
      • XXV Corps James: Charles Adam Heckman

(Established, from Department of Virginia and North Carolina, January 18 1865-April 19 1865, transferred to Military Division of the James)

  • Edward Otho Cresap Ord (January 18 1865-April 19 1865)

January 18 1865: The Department of Virginia was established, comprising the territory within 60 miles of Fort Monroe, Northampton and Accomac counties, Virginia south of the Rappahannock River and east of the Fredericksburg–Richmond–Petersburg–Weldon Railroad. Major-General Edward Otho Cresap Ord was appointed to command the Department of Virginia, arriving on 22nd January 1865. The District of Eastern Virginia transferred from the Department of Virginia and North Carolina to the Department of Virginia. The Sub-District of Beaufort (North Carolina) transferred from the Department of Virginia and North Carolina to the Department of Virginia. The Sub-District of New Bern transferred from the Department of Virginia and North Carolina to the Department of Virginia. The Army of the James transferred interim from the Department of Virginia and North Carolina to the Department of Virginia. Terry’s Provisional Corps transferred interim from the Department of Virginia and North Carolina to the Department of Virginia.

January 22 1865: Major-General Edward Otho Cresap Ord arrived to command the Department of Virginia.

January 31 1865: The Sub-District of Beaufort (North Carolina) transferred from the Department of Virginia to the District of North Carolina. Terry’s Provisional Corps transferred from the Department of Virginia to the Department of North Carolina. The District of Virginia was established in the Department of Virginia. The Sub-District of New Bern was discontinued, and its territory transferred to the District of North Carolina. The Army of the James transferred officially to the Department of Virginia. Terry’s Provisional Corps (Virginia) transferred to the Department of North Carolina.

March 25 1865: The District of Lynchburg was established in the Department of Virginia. It comprised the counties of Nelson, Amherst, Bedford, Campbell, Appomattox, Pittsylvania, Henry and Patrick counties of Virginia.

April 13 1865: The District of the Peninsula was established in the Department of Virginia. It comprised the territory between the York and James Rivers.

April 16 1865: Major-General Henry Wager Halleck was appointed to command the Department of Virginia but did not arrive to take command. Major-General Edward Otho Cresap Ord retained command of the Department of Virginia.

April 19 1865: The Department of Virginia transferred to the Military Division of the James. The District of Virginia transferred with the Department of Virginia to the Military Division of the James. The District of Eastern Virginia transferred with the Department of Virginia to the Military Division of the James. The District of the Peninsula transferred with the Department of Virginia to the Military Division of the James. The District of Beaufort North Carolina transferred with the Department of Virginia to the Military Division of the James. The District of Lynchburg transferred with the Department of Virginia to the Military Division of the James. The Army of the James transferred with the Department of Virginia to the Military Division of the James.

District of Eastern Virginia

(Transferred from Department of Virginia and North Carolina, January 18 1865-April 19 1865, transferred to Military Division of the James)

  • George Foster Shepley (January 18 1865-February 11 1865)
  • George Henry Gordon (February 11 1865-April 19 1865)

January 18 1865: The District of Eastern Virginia transferred from the Department of Virginia and North Carolina to the Department of Virginia. Brigadier-General George Foster Shepley retained command of the District of Eastern Virginia.

February 11 1865: Brigadier-General George Henry Gordon assumed command of the District of Eastern Virginia, succeeding Brigadier-General George Foster Shepley.

April 19 1865: The District of Eastern Virginia transferred with the Department of Virginia to the Military Division of the James.

Sub-District of Beaufort North Carolina

(Transferred from Department of Virginia and North Carolina, January 18 1865-January 31 1865, transferred to Department of North Carolina)

  • James Stewart (January 18 1865-January 31 1865)

January 18 1865: The Sub-District of Beaufort (North Carolina) transferred from the Department of Virginia and North Carolina to the Department of Virginia. Colonel James Stewart retained command of the Sub-District of Beaufort (North Carolina).

January 31 1865: The Sub-District of Beaufort (North Carolina) transferred from the Department of Virginia to the District of North Carolina.

Sub-District of New Bern

(Transferred from Department of Virginia and North Carolina, January 18 1865-January 31 1865, discontinued, to District of North Carolina)

  • Edward Harland (January 18 1865-January 31 1865)

January 18 1865: The Sub-District of New Bern transferred from the Department of Virginia and North Carolina to the Department of Virginia. Brigadier-General Edward Harland retained command of the Sub-District of New Bern.

January 31 1865: The Sub-District of New Bern was discontinued, and its territory transferred to the District of North Carolina.

District of Virginia

(Established, January 31 1865-April 19 1865, transferred to Military Division of the James)

  • Edward Otho Cresap Ord (January 31 1865-April 19 1865)

January 31 1865: The District of Virginia was established in the Department of Virginia. Major-General Edward Otho Cresap Ord assumed command of the District of Virginia.

April 19 1865: The District of Virginia transferred with the Department of Virginia to the Military Division of the James.

District of Lynchburg

(Established, March 25 1865-April 19 1865, transferred to Military Division of the James)

  • John Irvin Gregg (March 25 1865-April 19 1865)

March 25 1865: The District of Lynchburg was established in the Department of Virginia. It comprised the counties of Nelson, Amherst, Bedford, Campbell, Appomattox, Pittsylvania, Henry and Patrick counties of Virginia. Colonel John Irvin Gregg assumed command of the District of Lynchburg.

April 19 1865: The District of Lynchburg transferred with the Department of Virginia to the Military Division of the James.

District of the Peninsula

(Established, April 13 1865-April 19 1865, transferred to Military Division of the James)

  • Benjamin Chambers Ludlow (April 13 1865-April 19 1865)

April 13 1865: The District of the Peninsula was established in the Department of Virginia. It comprised the territory between the York and James Rivers. Lieutenant-Colonel Benjamin Chambers Ludlow assumed command of the District of the Peninsula.

April 19 1865: The District of the Peninsula transferred with the Department of Virginia to the Military Division of the James.

Army of the James

(Transferred from Department of Virginia and North Carolina, January 18 1865-April 19 1865, transferred to Military Division of the James)

  • Edward Otho Cresap Ord (January 18 1865-April 19 1865)

January 18 1865: The Army of the James transferred interim from the Department of Virginia and North Carolina to the Department of Virginia. Major-General Edward Otho Cresap Ord retained command of the Army of the James. XXIV Corps (James) transferred with the Army of the James from the Department of Virginia and North Carolina to the Department of Virginia. XXV Corps (James) transferred with the Army of the James from the Department of Virginia and North Carolina to the Department of Virginia.

January 31 1865: The Army of the James transferred officially to the Department of Virginia. Major-General Edward Otho Cresap Ord retained command of the Army of the James.

March 26 1865: The cavalry of the Army of the James transferred to Sheridan’s Cavalry Command (Potomac).

April 19 1865: The Army of the James transferred with the Department of Virginia to the Military Division of the James. XXIV Corps (James) transferred with the Army of the James to the Military Division of the James. XXV Corps (James) transferred with the Army of the James to the Military Division of the James.

XXIV Corps James

(Transferred from Department of Virginia and North Carolina, January 18 1865-April 19 1865, transferred to Military Division of the James)

  • John Gibbon (January 18 1865-April 19 1865)

January 18 1865: XXIV Corps (James) transferred with the Army of the James from the Department of Virginia and North Carolina to the Department of Virginia. Major-General John Gibbon retained command of XXIV Corps (James).

April 19 1865: XXIV Corps (James) transferred with the Army of the James to the Military Division of the James.

XXV Corps James

(Transferred from Department of Virginia and North Carolina, January 18 1865-April 19 1865, transferred to Military Division of the James)

  • Charles Adam Heckman (January 18 1865-February 2 1865)
  • Godfrey Weitzel (February 2 1865-April 19 1865)

January 18 1865: XXV Corps (James) transferred with the Army of the James from the Department of Virginia and North Carolina to the Department of Virginia. Brigadier-General Charles Adam Heckman retained command of XXV Corps (James).

February 2 1865: Major-General Godfrey Weitzel assumed command of XXV Corps (James), succeeding Brigadier-General Charles Adam Heckman.

April 19 1865: XXV Corps (James) transferred with the Army of the James to the Military Division of the James.

Terry’s Provisional Corps Virginia

(Transferred from Department of Virginia, January 18 1865-January 31 1865, transferred to Department of North Carolina)

  • Alfred Howe Terry (January 18 1865-January 31 1865)

January 18 1865: Terry’s Provisional Corps transferred interim from the Department of Virginia and North Carolina to the Department of Virginia. Major-General Alfred Howe Terry retained command of Terry’s Provisional Corps.

January 31 1865: Terry’s Provisional Corps transferred from the Department of Virginia to the Department of North Carolina.



Military Division of the James

Union High Command on April 19 1865 Eastern and Capital Theatre

  • Military Division of the James: Henry Wager Halleck
    • Department of the Potomac: George Gordon Meade
      • Army of the Potomac: George Gordon Meade
        • II Corps Potomac: Francis Channing Barlow temporary
        • V Corps Potomac: Charles Griffin
        • VI Corps Potomac: Horatio Gouverneur Wright
        • IX Corps Potomac: John Grubb Parke
      • Sheridan’s Cavalry Command: Philip Henry Sheridan
        • Cavalry Corps Potomac: Wesley Merritt
      • Department of Virginia: Edward Otho Cresap Ord
        • District of Eastern Virginia: George Henry Gordon
        • District of Virginia: Edward Otho Cresap Ord
        • District of Lynchburg: John Irvin Gregg
        • District of the Peninsula: Benjamin Chambers Ludlow
  • Middle Military Division: Winfield Scott Hancock
    • Middle Department: Lewis Wallace
      • District of Delaware and the Eastern Shore: John Reese Kenly
        • District of Annapolis: Frederic Dummer Sewall
        • VIII Corps Middle: Lewis Wallace
      • Department of Pennsylvania: George Cadwalader
        • District of Philadelphia: Orris Sanford Ferry
        • District of the Monongahela: Greenlief P Davis
        • Juniata District: Charles Hale Morgan
      • Department of Washington: Christopher Columbus Augur
        • District of St Mary’s: James Barnes
        • District of Alexandria: John Potts Slough
        • District of Washington: Moses N Wisewell
        • XXII Corps Washington: Christopher Columbus Augur
      • Department of West Virginia: Winfield Scott Hancock
      • Army of the Shenandoah: Alfred Thomas Archimedes Torbert

(Established, April 19 1865-June 27 1865, discontinued, to Military Division of the Atlantic)

  • Henry Wager Halleck (April 19 1865-June 27 1865)

April 19 1865: The Military Division of the James was established to comprise the Department of Virginia and the Department of the Potomac. Major-General Henry Wager Halleck assumed command of the Military Division of the James. The Department of the Potomac transferred to the Military Division of the James. The Department of Virginia transferred to the Military Division of the James. The parts of North Carolina not occupied by the armies of the Military Division of the Mississippi transferred from the Department of North Carolina to the Military Division of the James. The District of Virginia transferred with the Department of Virginia to the Military Division of the James. The District of Eastern Virginia transferred with the Department of Virginia to the Military Division of the James. The District of the Peninsula transferred with the Department of Virginia to the Military Division of the James. The District of Lynchburg transferred with the Department of Virginia to the Military Division of the James. The Army of the James transferred with the Department of Virginia to the Military Division of the James. The Army of the Potomac transferred with the Department of the Potomac to the Military Division of the James. Sheridan’s Cavalry Command (Potomac) transferred with the Department of the Potomac to the Military Division of the James.

May 6 1865: Sheridan’s Cavalry Command (James) was discontinued.

June 27 1865: The Military Division of the James was discontinued. The Department of the Potomac was discontinued. The Department of Virginia transferred from the Military Division of the James to the Military Division of the Atlantic. The Army of the James transferred with the Department of Virginia to the Military Division of the Atlantic. The District of Eastern Virginia transferred with the Department of Virginia to the Military Division of the Atlantic. The District of Lynchburg transferred with the Department of Virginia to the Military Division of the Atlantic. The Army of the James transferred to the Military Division of the Atlantic.


Department of Virginia

Union High Command on April 19 1865 Eastern and Capital Theatre

  • Military Division of the James: Henry Wager Halleck
    • Department of the Potomac: George Gordon Meade
      • Army of the Potomac: George Gordon Meade
        • II Corps Potomac: Francis Channing Barlow temporary
        • V Corps Potomac: Charles Griffin
        • VI Corps Potomac: Horatio Gouverneur Wright
        • IX Corps Potomac: John Grubb Parke
      • Sheridan’s Cavalry Command: Philip Henry Sheridan
        • Cavalry Corps Potomac: Wesley Merritt
      • Department of Virginia: Edward Otho Cresap Ord
        • District of Eastern Virginia: George Henry Gordon
        • District of Virginia: Edward Otho Cresap Ord
        • District of Lynchburg: John Irvin Gregg
        • District of the Peninsula: Benjamin Chambers Ludlow
  • Middle Military Division: Winfield Scott Hancock
    • Middle Department: Lewis Wallace
      • District of Delaware and the Eastern Shore: John Reese Kenly
        • District of Annapolis: Frederic Dummer Sewall
        • VIII Corps Middle: Lewis Wallace
      • Department of Pennsylvania: George Cadwalader
        • District of Philadelphia: Orris Sanford Ferry
        • District of the Monongahela: Greenlief P Davis
        • Juniata District: Charles Hale Morgan
      • Department of Washington: Christopher Columbus Augur
        • District of St Mary’s: James Barnes
        • District of Alexandria: John Potts Slough
        • District of Washington: Moses N Wisewell
        • XXII Corps Washington: Christopher Columbus Augur
      • Department of West Virginia: Winfield Scott Hancock
      • Army of the Shenandoah: Alfred Thomas Archimedes Torbert

(Transferred to Military Division of the James, April 19 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Edward Otho Cresap Ord (April 19 1865-May 13 1865)
  • Alfred Howe Terry (temporary May 13 1865-June 14 1865, June 14 1865-June 27 1865)

April 19 1865: The Department of Virginia transferred to the Military Division of the James. Major-General Henry Wager Halleck’s appointment to command the Department of Virginia was revoked before he assumed command. Major-General Edward Otho Cresap Ord retained command of the Department of Virginia. The District of Virginia transferred with the Department of Virginia to the Military Division of the James. The District of the Peninsula transferred with the Department of Virginia to the Military Division of the James. The District of Lynchburg transferred with the Department of Virginia to the Military Division of the James. The Army of the James transferred with the Department of Virginia to the Military Division of the James.

April 27 1865: The District of the Peninsula was discontinued, and its territory transferred to the Sub-District of the Peninsula in the District of Eastern Virginia.

May 13 1865: Major-General Alfred Howe Terry assumed interim temporary command of the Department of Virginia, succeeding Major-General Edward Otho Cresap Ord.

May 21 1865: The District of Fort Monroe was established in the Department of Virginia.

May 22 1865: The District of the Nottoway was established in the Department of Virginia.

May 25 1865: The District of Henrico was established in the Department of Virginia. The Sub-District of Blackwater was established in the District of the Nottoway in the Department of Virginia. The Sub-District of Roanoke was established in the District of the Nottoway. The Sub-District of the Appomattox was established in the District of the Nottoway in the Department of Virginia. The Sub-District of the Peninsula transferred from the District of Eastern Virginia to the District of Fort Monroe. The Sub-District of the Rappahannock was established in the Department of Virginia. The Sub-District of the South Anna was established in the Department of Virginia.

June 14 1865: Brigadier-General Alfred Howe Terry assumed full command of the Department of Virginia.

June 27 1865: The Department of Virginia transferred from the Military Division of the James to the Military Division of the Atlantic. The District of Virginia transferred with the Department of Virginia to the Military Division of the Atlantic. The Army of the James transferred with the Department of Virginia to the Military Division of the Atlantic. The District of Henrico transferred with the Department of Virginia to the Military Division of the Atlantic. The District of Eastern Virginia transferred with the Department of Virginia to the Military Division of the Atlantic. The District of Fort Monroe transferred with the Department of Virginia to the Military Division of the Atlantic. The District of Lynchburg transferred with the Department of Virginia to the Military Division of the Atlantic. The District of the Nottoway transferred with the Department of Virginia to the Military Division of the Atlantic. The Sub-District of the Rappahannock transferred with the Department of Virginia to the Military Division of the Atlantic. The Sub-District of the South Anna transferred with the Department of Virginia to the Military Division of the Atlantic. The Sub-District of the Peninsula transferred with the District of Fort Monroe to the Military Division of the Atlantic.

District of Virginia

(Transferred to Military Division of the James, April 19 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Edward Otho Cresap Ord (April 19 1865-June 27 1865)

April 19 1865: The District of Virginia transferred with the Department of Virginia to the Military Division of the James. Major-General Edward Otho Cresap Ord retained command of the District of Virginia.

June 27 1865: The District of Virginia transferred with the Department of Virginia to the Military Division of the Atlantic.

District of Eastern Virginia

(Transferred to Military Division of the James, April 19 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • George Henry Gordon (April 19 1865-June 27 1865)

April 19 1865: The District of Eastern Virginia transferred with the Department of Virginia to the Military Division of the James. Brigadier-General George Henry Gordon retained command of the District of Eastern Virginia.

April 27 1865: The District of the Peninsula was discontinued. The Sub-District of the Peninsula was established in the District of Eastern Virginia.

May 25 1865: The Sub-District of the Peninsula transferred from the District of Eastern Virginia to the District of Fort Monroe.

June 27 1865: The District of Eastern Virginia transferred with the Department of Virginia to the Military Division of the Atlantic.

Sub-District of the Peninsula

(Established, from District of the Peninsula, April 27 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Benjamin Chambers Ludlow (April 27 1865-June 27 1865)

April 27 1865: The District of the Peninsula was discontinued, and renamed the Sub-District of the Peninsula in the District of Eastern Virginia. The Sub-District of the peninsula was established in the District of Eastern Virginia. It was bounded in the north by the York and Pamunkey Rivers, in the east by the Chesapeake Bay, in the south by the James River and in the west by the Richmond, Fredericksburg & Potomac Railroad. The Sub-District of the Peninsula was established in the District of Eastern Virginia. Colonel Benjamin Chambers Ludlow retained command of the Sub-District of the Peninsula.

May 25 1865: The Sub-District of the Peninsula transferred to the District of Fort Monroe.

District of Lynchburg

(Transferred to Military Division of the James, April 19 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • John Irvin Gregg (April 19 1865-June 27 1865)

April 19 1865: The District of Lynchburg transferred with the Department of Virginia to the Military Division of the James. Colonel John Irvin Gregg retained command of the District of Lynchburg.

June 27 1865: The District of Lynchburg transferred with the Department of Virginia to the Military Division of the Atlantic.

District of the Peninsula

(Transferred to Military Division of the James, April 19 1865-April 27 1865, discontinued, to Sub-District of the Peninsula)

  • Benjamin Chambers Ludlow (April 19 1865-April 27 1865)

April 19 1865: The District of the Peninsula transferred with the Department of Virginia to the Military Division of the James. Lieutenant-Colonel Benjamin Chambers Ludlow retained command of the District of the Peninsula.

April 27 1865: The District of the Peninsula was discontinued, and renamed the Sub-District of the Peninsula in the District of Eastern Virginia.

District of Fort Monroe

(Established, May 21 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Nelson Appleton Miles (May 21 1865-June 27 1865)

May 21 1865: The District of Fort Monroe was established in the Department of Virginia. It comprised Fort Monroe and the counties of Accomac and Northampton. Brigadier-General Nelson Appleton Miles assumed command of the District of Fort Monroe.

May 25 1865: The Sub-District of the Peninsula transferred from the District of Eastern Virginia to the District of Fort Monroe. It was redefined to include the counties of Mathews, Gloucester, New Kent, King William, Charles City, James City, York, Warwick and Elizabeth City in Virginia, except for Fort Monroe.

June 27 1865: The District of Fort Monroe transferred with the Department of Virginia to the Military Division of the Atlantic. The Sub-District of the Peninsula transferred with the District of Fort Monroe to the Military Division of the Atlantic.

Sub-District of the Peninsula

(Transferred from District of Eastern Virginia, May 25 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Benjamin Chambers Ludlow (May 25 1865-June 27 1865)

May 25 1865: The Sub-District of the Peninsula transferred from the District of Eastern Virginia to the District of Fort Monroe. It was redefined to include the counties of Mathews, Gloucester, New Kent, King William, Charles City, James City, York, Warwick and Elizabeth City in Virginia, except for Fort Monroe. Colonel Benjamin Chambers Ludlow retained command of the Sub-District of the Peninsula.

June 27 1865: The Sub-District of the Peninsula transferred with the District of Fort Monroe to the Military Division of the Atlantic.

District of the Nottoway

(Established, May 22 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • George Lucas Hartsuff (May 22 1865-June 27 1865)

May 22 1865: The District of the Nottoway was established in the Department of Virginia. It comprised the counties south of Petersburg. Major-General George Lucas Hartsuff assumed command of the District of the Nottoway.

May 25 1865: The Sub-District of Blackwater was established in the District of the Nottoway in the Department of Virginia. It comprised the counties of Sussex, Surrey, Greenville, Brunswick, Dinwiddie and Price George in Virginia. The Sub-District of Roanoke was established in the District of the Nottoway. It comprised the counties of Mecklenburg, Lunenburg, Prince Edward, Nottoway, Charlotte and Halifax in Virginia. The Sub-District of the Appomattox was established in the District of Nottoway in the Department of Virginia. It comprised the counties of Chesterfield, Amelia, Powhatan, Cumberland and Buckingham in Virginia.

June 27 1865: The District of the Nottoway transferred with the Department of Virginia to the Military Division of the Atlantic. The Sub-District of Blackwater transferred with the District of the Nottoway to the Military Division of the Atlantic. The Sub-District of Roanoke transferred with the District of the Nottoway to the Military Division of the Atlantic. The Sub-District of the Appomattox transferred with the District of the Nottoway to the Military Division of the Atlantic.

Sub-District of Blackwater

(Established, May 25 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Gilbert Hunt McKibbin (May 25 1865-June 27 1865)

May 25 1865: The Sub-District of Blackwater was established and transferred to the District of the Nottoway in the Department of Virginia. It comprised the counties of Sussex, Surrey, Greenville, Brunswick, Dinwiddie and Price George in Virginia. Captain Gilbert Hunt McKibbin assumed command of the Sub-District of Blackwater.

Jun e27 1865: The Sub-District of Blackwater transferred with the District of the Nottoway to the Military Division of the Atlantic.

Sub-District of Roanoke

(Established, May 25 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Edward Ferrero (May 25 1865-June 27 1865)

May 25 1865: The Sub-District of Roanoke was established in the District of the Nottoway. It comprised the counties of Mecklenburg, Lunenburg, Prince Edward, Nottoway, Charlotte and Halifax in Virginia. Brigadier-General Edward Ferrero assumed command of the Sub-District of Roanoke.

June 27 1865: The Sub-District of Roanoke transferred with the District of the Nottoway to the Military Division of the Atlantic.

Sub-District of the Appomattox

(Established, May 25 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Charles Henry Smith (May 25 1865-June 27 1865)

May 25 1865: The Sub-District of the Appomattox was established and transferred to the District of Nottoway in the Department of Virginia. It comprised the counties of Chesterfield, Amelia, Powhatan, Cumberland and Buckingham in Virginia. Colonel Charles Henry Smith assumed command of the Sub-District of the Appomattox.

June 27 1865: The Sub-District of the Appomattox transferred with the District of the Nottoway to the Military Division of the Atlantic.

District of Henrico

(Established, May 25 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Marsena Rudolph Patrick (May 25 1865-June 9 1865)
  • John Wesley Turner (June 9 1865-June 27 1865)

May 25 1865: The District of Henrico was established in the Department of Virginia, to comprise Henrico County, Virginia. Brigadier-General Marsena Rudolph Patrick assumed command of the District of Henrico.

June 9 1865: Brigadier-General John Wesley Turner assumed command of the District of Henrico, succeeding Major-General Marsena Rudolph Patrick.

June 27 1865: The District of Henrico transferred with the Department of Virginia to the Military Division of the Atlantic.

Sub-District of the Rappahannock

(Established, May 25-June 27 1865, transferred to Military Division of the Atlantic)

  • Edwin Vose Sumner Jr (May 25-June 27 1865)

May 25 1865: The Sub-District of the Rappahannock was established in the Department of Virginia. It comprised the counties of Middlesex, King and Queen, Essex, Caroline, Spotsylvania and Orange in Virginia. Colonel Edwin Vose Sumner Jr assumed command of the Sub-District of the Rappahannock.

June 27 1865: The Sub-District of the Rappahannock transferred with the Department of Virginia to the Military Division of the Atlantic.

Sub-District of the South Anna

(Established, May 25 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Alvin Coe Voris (May 25-June 27 1865)

May 25 1865: The Sub-District of the South Anna was established in the Department of Virginia. It comprised the counties of Hanover, Louisa, Albemarle, Goochland, Fluvanna, and Greene in Virginia. Lieutenant-Colonel Alvin Coe Voris assumed command of the Sub-District of the South Anna.

June 27 1865: The Sub-District of the South Anna transferred with the Department of Virginia to the Military Division of the Atlantic.

Army of the James

(Transferred to Military Division of the James, April 19 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Edward Otho Cresap Ord (April 19 1865-June 27 1865)

April 19 1865: The Army of the James transferred with the Department of Virginia to the Military Division of the James. XXIV Corps (James) transferred with the Army of the James to the Military Division of the James. XXV Corps (James) transferred with the Army of the James to the Military Division of the James. Major-General Edward Otho Cresap Ord retained command of the Army of the James.

May 23 1865: XXV Corps (James) transferred from the Army of the James to the Military Division of the Southwest.

June 27 1865: The Army of the James transferred with the Department of Virginia to the Military Division of the Atlantic. XXIV Corps (James) transferred with the Army of the James to the Military Division of the Atlantic.

XXIV Corps James

(Transferred to Military Division of the James, April 19 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • John Gibbon (April 19 1865-April 27 1865)
  • John Wesley Turner (April 27 1865-May 17 1865)
  • John Gibbon (May 17 1865-June 27 1865)

April 19 1865: XXIV Corps (James) transferred with the Army of the James to the Military Division of the James. Major-General John Gibbon retained command of XXIV Corps (James).

April 27 1865: Brigadier-General John Wesley Turner assumed temporary command of XXIV Corps (James), succeeding Major-General John Gibbon.

May 17 1865: Major-General John Gibbon assumed command of XXIV Corps (James), succeeding Brigadier-General John Wesley Turner.

June 2871865: XXIV Corps (James) transferred with the Army of the James to the Military Division of the Atlantic.

XXV Corps James

(Transferred to Military Division of the James, April 19 1865-May 23 1865, transferred to Military Division of the Southwest)

  • Godfrey Weitzel (April 19 1865-May 23 1865)

April 19 1865: XXV Corps (James) transferred with the Army of the James to the Military Division of the James. Major-General Godfrey Weitzel retained command of XXV Corps (James).

May 23 1865: XXV Corps (James) transferred from the Army of the James to the Military Division of the Southwest.


Department of the Potomac

Union High Command on April 19 1865 Eastern and Capital Theatre

  • Military Division of the James: Henry Wager Halleck
    • Department of the Potomac: George Gordon Meade
      • Army of the Potomac: George Gordon Meade
        • II Corps Potomac: Francis Channing Barlow temporary
        • V Corps Potomac: Charles Griffin
        • VI Corps Potomac: Horatio Gouverneur Wright
        • IX Corps Potomac: John Grubb Parke
      • Sheridan’s Cavalry Command: Philip Henry Sheridan
        • Cavalry Corps Potomac: Wesley Merritt
      • Department of Virginia: Edward Otho Cresap Ord
        • District of Eastern Virginia: George Henry Gordon
        • District of Virginia: Edward Otho Cresap Ord
        • District of Lynchburg: John Irvin Gregg
        • District of the Peninsula: Benjamin Chambers Ludlow
  • Middle Military Division: Winfield Scott Hancock
    • Middle Department: Lewis Wallace
      • District of Delaware and the Eastern Shore: John Reese Kenly
        • District of Annapolis: Frederic Dummer Sewall
        • VIII Corps Middle: Lewis Wallace
      • Department of Pennsylvania: George Cadwalader
        • District of Philadelphia: Orris Sanford Ferry
        • District of the Monongahela: Greenlief P Davis
        • Juniata District: Charles Hale Morgan
      • Department of Washington: Christopher Columbus Augur
        • District of St Mary’s: James Barnes
        • District of Alexandria: John Potts Slough
        • District of Washington: Moses N Wisewell
        • XXII Corps Washington: Christopher Columbus Augur
      • Department of West Virginia: Winfield Scott Hancock
      • Army of the Shenandoah: Alfred Thomas Archimedes Torbert

(Transferred to Military Division of the James, April 19 1865-June 27 1865, discontinued, to Military Division of the Atlantic)

  • George Gordon Meade (April 19 1865-June 27 1865)

April 19 1865: The Department of the Potomac transferred to the Military Division of the James. Major-General George Gordon Meade retained command of the Department of the Potomac. The Army of the Potomac transferred with the Department of the Potomac to the Military Division of the James. Sheridan’s Cavalry Command (Potomac) transferred with the Department of the Potomac to the Military Division of the James.

May 6 1865: Sheridan’s Cavalry Command (Potomac) was discontinued.

June 27 1865: The Department of the Potomac was discontinued, and its territory incorporated into the Middle Department. The Army of the Potomac transferred from the Department of the Potomac to the Military Division of the Atlantic.

Army of the Potomac

(Transferred to Military Division of the James, April 19 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • George Gordon Meade (April 19 1865-June 27 1865)

April 19 1865: The Army of the Potomac transferred with the Department of the Potomac to the Military Division of the James. Major-General George Gordon Meade retained command of the Army of the Potomac. II Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James. V Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James. VI Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James. IX Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James.

May 6 1865: Cavalry Corps (Potomac) transferred from Sheridan’s Cavalry Command to the Army of the Potomac.

June 27 1865: The Army of the Potomac transferred from the Department of the Potomac to the Military Division of the Atlantic. Cavalry Corps (Potomac) was discontinued. II Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the Atlantic. V Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the Atlantic. VI Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the Atlantic.

II Corps Potomac

(Transferred to Military Division of the James, April 19 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Francis Channing Barlow (temporary April 19 1865-May 5 1865)
  • Andrew Atkinson Humphreys (May 5 1865-June 9 1865)
  • Gershom Mott (temporary June 9 1865-June 20 1865)
  • Andrew Atkinson Humphreys (June 20 1865-June 27 1865)

April 19 1865: II Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James. Brigadier-General Francis Channing Barlow retained temporary command of II Corps (Potomac).

May 5 1865: Major-General Andrew Atkinson Humphreys assumed command of II Corps (Potomac), succeeding Brigadier-General Francis Channing Barlow.

June 9 1865: Major-General Gershom Mott assumed temporary command of II Corps (Potomac), succeeding Major-General Andrew Atkinson Humphreys.

June 20 1865: Major-General Andrew Atkinson Humphreys assumed command of II Corps (Potomac), succeeding Major-General Gershom Mott.

June 27 1865: II Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the Atlantic.

V Corps Potomac

(Transferred to Military Division of the James, April 19 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Charles Griffin (April 19 1865-June 27 1865)

April 19 1865: V Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James. Major-General Charles Griffin retained command of V Corps (Potomac).

June 27 1865: V Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the Atlantic.

VI Corps Potomac

(Transferred to Military Division of the James, April 19 1865-June 27 1865, transferred to Military Division of the Atlantic)

  • Horatio Gouverneur Wright (April 19 1865-June 27 1865)

April 19 1865: VI Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James. Major-General Horatio Gouverneur Wright retained command of VI Corps (Potomac).

June 27 1865: VI Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the Atlantic.

IX Corps Potomac

(Transferred to Military Division of the James, April 19 1865-April 24 1865, transferred to Department of Washington)

  • John Grubb Parke (April 19 1865-April 24 1865)

April 19 1865: IX Corps (Potomac) transferred with the Army of the Potomac to the Military Division of the James. Major-General John Grubb Parke retained command of IX Corps (Potomac).

April 24 1865: IX Corps (Potomac) transferred from the Army of the Potomac to the Department of Washington.

Cavalry Corps Potomac

(Transferred from Sheridan’s Cavalry Command (Potomac), May 6 1865-June 27 1865, discontinued)

  • Wesley Merritt (May 6 1865-May 22 1865)
  • George Crook (May 22 1865-June 1 1865)
  • William Wells (June 1 1865-June 27 1865)

May 6 1865: Cavalry Corps (Potomac) transferred from Sheridan’s Cavalry Command (Potomac) to the Army of the Potomac. Major-General Wesley Merritt retained command of Cavalry Corps (Potomac).

May 22 1865: Major-General George Crook assumed command of Cavalry Corps (Potomac), succeeding Major-General Wesley Merritt.

June 1 1865: Brigadier-General William Wells assumed command of Cavalry Corps (Potomac), succeeding Major-General George Crook.

June 27 1865: Cavalry Corps (Potomac) was discontinued.

Sheridan’s Cavalry Command James

(Transferred to Military Division of the James, April 19 1865-May 6 1865, discontinued, to Cavalry Corps (Potomac)

  • Philip Henry Sheridan (April 19 1865-May 6 1865)

April 19 1865: Sheridan’s Cavalry Command (Potomac) transferred with the Department of the Potomac to the Military Division of the James. Cavalry Corps (Potomac) transferred with Sheridan’s Cavalry Command (Potomac) to the Military Division of the James. Major-General Philip Henry Sheridan retained command of Sheridan’s Cavalry Command (Potomac).

May 6 1865: Sheridan’s Cavalry Command (James) was discontinued.

Cavalry Corps James

(Transferred to Military Division of the James, April 19 1865-May 6 1865, transferred to Army of the Potomac)

  • Wesley Merritt (April 19 1865-May 6 1865)

April 19 1865: Cavalry Corps (Potomac) transferred with Sheridan’s Cavalry Command (Potomac) to the Military Division of the James. Brigadier-General Wesley Merritt retained command of Cavalry Corps (Potomac).

May 6 1865: Cavalry Corps (James) transferred from Sheridan’s Cavalry Command (Potomac) to the Army of the Potomac.


Union High Command on June 27 1865 Eastern and Capital Theatre

  • Military Division of the Atlantic: George Gordon Meade awaited
    • Department of the East: John Adams Dix
    • Department of Washington: Christopher Columbus Augur
      • District of Alexandria: John Potts Slough
      • District of Washington: Orlando Bolivar Willcox
      • IX Corps Washington: John Grubb Parke
    • Department of Virginia: Alfred Howe Terry
      • District of Eastern Virginia: George Henry Gordon
      • District of Virginia: Edward Otho Cresap Ord
      • District of Lynchburg: John Irvin Gregg
      • District of Fort Monroe: Nelson Appleton Miles
        • Sub-District of the Peninsula: Benjamin Chambers Ludlow
      • District of the Nottoway: George Lucas Hartsuff
        • Sub-District of Blackwater: Gilbert Hunt McKibbin
        • Sub-District of Roanoke: Edward Ferrero
        • Sub-District of the Appomattox: Charles Henry Smith
      • District of Henrico: John Wesley Turner
      • Sub-District of the Rappahannock: Edwin Vose Sumner Jr
      • Sub-District of the South Anna: Alvin Coe Voris
    • Department of North Carolina: Samuel Powhatan Carter temporary
      • District of Beaufort (NC): Charles Jackson Paine
      • District of Wilmington: John Worthington Ames
      • Army of the James: Edward Otho Cresap Ord
        • XXIV Corps James: John Gibbon
      • XXIII Corps Ohio: Jacob Dolson Cox
        • X Corps North Carolina: Adelbert Ames
    • Middle Department: Lewis Wallace interim Winfield Scott Hancock awaited
      • District of Delaware and the Eastern Shore: John Moulder Wilson temporary
      • District of Annapolis: Frederic Dummer Sewall
    • Department of South Carolina: Quincy Adams Gillmore awaited
    • Army of the Potomac: George Gordon Meade
      • II Corps Potomac: Andrew Atkinson Humphreys
      • V Corps Potomac: Charles Griffin
      • VI Corps Potomac: Horatio Gouverneur Wright

 

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