Union Organisations – Departments

Union Organisations – Departments

Departments typically reported directly to the President, to the War Department and, were subject to the orders of the General-in-Chief. They were largely independent and were effectively the highest level territorial command from before the war until the end of 1863. Close control was often difficult due to distance and unreliable or slow communications, so Department commanders enjoyed substantial authority and autonomy within their territory. From late 1863 onwards, more and more Departments were subjected to greater coordination as part of a Military Division, and all had been thus allocated mid-1865. 

Departments were originally created to oversee regions where Union forces were being organised in the Union states. Departments were extended or created progressively as Union forces occupied segments of the Confederate States. They eventually extended across the entire Confederacy by the end of the war. As the advancing Union army occupied Confederate territory, Departments and their sub-units were established, discontinued, or adjusted to reflect changing priorities. The Union also had the challenge of maintaining a presence and prosecuting operations against Native Americans in the western territories, and this required changes in the Departments in frontier and far western regions.

Some Departments were subdivided into one or more Districts and Sub-Districts. The size and borders of Departments and their Districts and Sub-Districts evolved in response to local circumstances and to changing command priorities. Some territorial commands were aligned with state borders, but the majority reflected territories appropriate to military operations, regardless of state and territorial borders.

The nomenclature of territorial command could be inconsistent, and anomalies occasionally arose over the geographical extent and authority of some Departments.

Alphabetical Index

Department of Alabama 27 June 1865-31 December 1865

Department of Annapolis, Maryland 27 April 1861-19 July 1861

Department of Arkansas 6 January 1864-1 August 1865

Department of California #1 1 January 1861-15 January 1861

Department of California #2 27 June 1865-31 December 1865

Department of the Columbia 27 June 1865-31 December 1865

Department of the Cumberland #1 15 August 1861-9 November 1861

Department of the Cumberland #2 24 October 1862-27 June 1865

Department of the East #1 1 January 1861-26 October 1861

Department of the East #2 3 January 1863-31 December 1865

Department of Florida #1 13 April 1861-15 March 1862

Department of Florida #2 27 June 1865-31 December 1865

Department of Georgia 27 June 1865-31 December 1865

Department of the Gulf 23 February 1862-27 June 1865

Department of Kansas #1 9 November 1861-19 March 1862

Department of Kansas #2 2 May 1862-19 September 1862

Department of Kansas #3 1 January 1864-30 January 1865

Department of Kentucky #1 28 May 1861-15 August 1861

Department of Kentucky #2 10 February 1865-31 December 1865

Department of Key West, Florida 11 January 1862-15 March 1862

Department of Louisiana 27 June 1865-31 December 1865

Department of Maryland 19 July 1861-25 July 1861

Middle Department 22 March 1862-31 December 1865

Department of Mississippi 27 June 1865-31 December 1865

Department of the Mississippi #1 11 March 1862-19 September 1862

Department of the Mississippi #2 28 November 1864-5 June 1865

Department of the Missouri 9 November 1861–31 December 1865

Department of the Monongahela 9 June 1863-6 April 1864

Mountain Department 11 March 1862-26 June 1862

Department of New England 1 October 1861-20 February 1862

Department of New Mexico #1 1 January 1861–3 July 1861

Department of New Mexico #2 9 November 1861-27 June 1865

Department of New York 26 October 1861-3 January 1863

Department of North Carolina #1 7 January 1862-15 July 1863

Department of North Carolina #2 31 January 1865-31 December 1865

Department of Northeastern Virginia 27 May 1861-17 August 1861

Northern Department 12 January 1864-27 June 1865

Department of the Northwest 6 September 1862-27 June 1865

Department of the Ohio #1 3 May 1861-11 March 1862

Department of the Ohio #2 19 August 1862-17 January 1865

Department of the Ohio #3 27 June 1865-31 December 1865

Department of Oregon 1 January 1861-15 January 1861

Department of the Pacific 15 January 1861-27 June 1865

Department of Pennsylvania #1 27 April 1861-17 August 1861

Department of Pennsylvania #2 1 December 1864-27 June 1865

Department of the Potomac 17 August 1861-27 June 1865

Department of the Rappahannock Virginia 4 April 1862-26 June 1862

Department of the Shenandoah #1 19 July 1861-17 August 1861

Department of the Shenandoah #2 4 April 1862-26 June 1862

Department of the South 15 March 1862-27 June 1865

Department of South Carolina 27 June 1865-31 December 1865

Department of the Susquehanna 9 June 1863-1 December 1864

Department of Tennessee 27 June 1865-31 December 1865

Department of the Tennessee 16 October 1862-28 November 1864

Department of Texas #1 1 January 1861-8 November 1862

Department of Texas #2 27 June 1865-31 December 1865

Department of Utah 1 January 1861-17 July 1861

Department of Virginia #1 22 May 1861-15 July 1863

Department of Virginia #2 18 January 1865-31 December 1865

Department of Virginia and North Carolina 15 July 1863-18 January 1865

Department of Washington, District of Columbia #1 9 April 1861-17 August 1861

Department of Washington, District of Columbia #2 2 February 1863-31 December 1865

Department of the West 1 January 1861-3 July 1861

Western Department 3 July 1861-9 November 1861

Department of West Virginia 24 June 1863-27 June 1865

Department of Western Virginia 19 September 1861-11 March 1862

Department of California #1

1 January 1861-15 January 1861

Benjamin Lloyd Beall temporary 1 January 1861-15 January 1861

1 January 1861: The Department of California was established. It comprised the country west of the Rocky Mountains south of the Oregon Territory and including the Utah Territory west of the 117 degree of longitude and the New Mexico Territory west of 100 degrees longitude. Headquarters were at San Francisco.

1 January 1861: The Department of California was commanded temporarily by Lieutenant-Colonel Benjamin Lloyd Beall.

15 January 1861: The Department of California was discontinued, and its territory included in the Department of the Pacific.

Department of California #2

27 June 1865-31 December 1865

Irvin McDowell 27 June 1865-31 December 1865

27 June 1865: The Department of California was established to include California, Nevada, the Arizona Territory, and the New Mexico Territory transferred from the Department of the Pacific.

27 June 1865: The Military Division of the Pacific was established to include the Department of California and the Department of the Columbia.

27 June 1865: The Department of California was subordinated to the Military Division of the Pacific.

27 June 1865: The District of Arizona transferred from the Department of the Pacific to the Department of California.

27 June 1865: The District of the Humboldt was discontinued.

27 June 1865: The District of Oregon was discontinued.

27 June 1865: The District of California was discontinued.

27 June 1865: The District of Southern California was discontinued.

27 June 1865: Major-General Irvin McDowell was appointed to command the Department of California, arriving on 1 July 1865.

1 July 1865: Major-General Irvin McDowell arrived to command the Department of California.

21 July 1865: The District of Arizona was discontinued.

Department of the Columbia

27 June 1865-31 December 1865

George Wright 27 June 1865-30 July 1865

George Byron Currey temporary 27 June 1865-13 November 1865

Charles Swain Lovell temporary 13 November 1865-20 November 1865

John Miller Drake interim 20 November 1865-1 December 1865

Charles Swain Lovell 13 November 1865-31 December 1865

27 June 1865: The Department of the Columbia was established in the Military Division of the Pacific. It included Oregon, Washington Territory and Idaho Territory transferred from the Department of the Pacific.

27 June 1865: Brigadier-General George Wright was appointed to command the Department of the Columbia.

27 June 1865: Colonel George Byron Currey assumed temporary command of the Department of the Columbia, arriving on 8 August 1865.

30 July 1865: Brigadier-General George Wright died prior to taking command of the Department of the Columbia.

30 July 1865: Colonel George Byron Currey retained temporary command of the Department of the Columbia, arriving on 18 August 1865.

18 August 1865: Colonel George Byron Currey arrived to assume temporary command of the Department of the Columbia.

13 November 1865: Colonel Charles Swain Lovell was appointed to temporary command of the Department of the Columbia, arriving on 1 December 1865, to succeed Colonel George Byron Currey.

20 November 1865: Lieutenant-Colonel John Miller Drake assumed temporary command of the Department of the Columbia, succeeding Colonel George Byron Curry.

1 December 1865: Colonel Charles Swain Lovell arrived to command the Department of the Columbia, succeeding Lieutenant Colonel John Miller Drake.

Department of New Mexico #1

1 January 1861–3 July 1861

Thomas Turner Fauntleroy 1 January 1861-21 January 1861 interim 21 March 1861

William Wing Loring 22 January 1861-30 April 1861

Edward Richard Sprigg Canby temporary 14 May 1861-10 June 1861, 11 June 1861-3 July 1861

1 January 1861: The Department of New Mexico comprised the Territory of New Mexico east of 110 degrees of longitude and a part of southwest Colorado Territory. Headquarters were at Santa Fe.

1 January 1861: The Department of New Mexico was commanded by Colonel Thomas Turner Fauntleroy.

22 January 1861: Colonel William Wing Loring was appointed to command the Department of New Mexico, arriving on 22 March 1861.

22 March 1862: Colonel William Wing Loring arrived to command the Department of New Mexico, succeeding Colonel Thomas Turner Fauntleroy, who defected to the Confederacy.

1 May 1861: Command of the Department of New Mexico became vacant after Colonel William Wing Loring resigned to join the Confederacy.

14 May 1861: Colonel Edward Richard Sprigg Canby assumed temporary command of the Department of New Mexico, succeeding Colonel William Wing Loring.

11 June 1861: Colonel Edward Richard Sprigg Canby was appointed to full command of the Department of New Mexico, arriving on 23 June 1861.

23 June 1861: Colonel Edward Richard Sprigg Canby assumed full command of the Department of New Mexico.

3 July 1861: The Department of New Mexico was discontinued, and its territory incorporated into the Western Department.

Department of New Mexico #2

9 November 1861-27 June 1865

Edward Richard Sprigg Canby 9 November 1861-25 August 1862, interim 26 August 1862-17 September 1862

James Henry Carleton 26 August 1862-27 June 1865

9 November 1861: The Department of New Mexico was re-established, comprising New Mexico Territory from the Western Department.

9 November 1861: Colonel Edward Richard Sprigg Canby assumed command of the Department of New Mexico.

9 November 1861: The Southern District of New Mexico transferred from the Western Department to the Department of New Mexico.

14 February 1862: Fort Garland in the Colorado territory transferred from the Department of Kansas to the Department of New Mexico.

16 April 1862: The Southern District of New Mexico was discontinued in the Department of New Mexico.

16 April 1862: The Central and Northern District of New Mexico was established in the Department of New Mexico, comprising the territory north of Albuquerque, New Mexico.

16 June 1862: The Central and Northern District of New Mexico was discontinued.

26 August 1862: Brigadier-General James Henry Carleton was appointed to command the Department of New Mexico, arriving on 18 September 1862, to succeed Brigadier-General Edward Richard Sprigg Canby.

30 August 1862: The District of Arizona was established in the Department of New Mexico, comprising the Arizona Territory.

18 September 1862: Brigadier-General James Henry Carleton arrived to command the Department of New Mexico, succeeding Brigadier-General Edward Richard Sprigg Canby.

8 December 1864: The District of Arizona was discontinued.

27 June 1865: Fort Garland, Arkansas, transferred from the Department of New Mexico to the Department of the Missouri.

27 June 1865: The Department of New Mexico was discontinued, and its territory transferred to the new Department of California and the Department of the Missouri.

Department of Oregon

1 January 1861-15 January 1861

George Wright 1 January 1861-15 January 1861

1 January 1861: The Department of Oregon comprised the territory of the later states of Washington, Idaho and all but the south-western corner of Oregon. Headquarters were at Vancouver.

1 January 1861: The Department of Oregon was commanded by Colonel George Wright.

15 January 1861: The Department of Oregon was discontinued, and its territory incorporated into the new District of Oregon in the Department of the Pacific.

Department of the Pacific

15 January 1861-27 June 1865

Albert Sidney Johnston 15 January 1861-22 March 1861 interim 11 April 1861, interim 12 April 1861-24 April 1861

Edwin Vose Sumner 25 April 1861-19 October 1861

George Wright temporary 20 October 1861-November 1861, 19 November 1861-20 May 1864

Irvin McDowell 25 May 1864-27 June 1865

15 January 1861: The Department of the Pacific was established, comprising the territory west of the Rocky Mountains except for the part of Utah Territory east of 117 degrees west longitude and except for New Mexico Territory east of 110 degrees west longitude.

15 January 1861: Colonel Albert Sidney Johnston assumed command of the Department of the Pacific.

15 January 1861: The District of Oregon was established in the Department of the Pacific, comprising the state of Oregon and Washington Territory except for the territories of the Rogue and Umpqua Rivers.

2 March 1861: Nevada Territory and Dakota Territory were included in the Department of the Pacific.

23 March 1861: Brigadier-General Edwin Vose Sumner was appointed to command the Department of the Pacific, arriving on 25 April 1861.

10 April 1861: Colonel Albert Sidney Johnston resigned as commander of the Department of the Pacific but awaited the arrival of his successor, Brigadier-General Edwin Vose Sumner, before departing.

12 April 1861: Colonel Albert Sidney Johnston retained interim command of the Department of the Pacific.

25 April 1861: Brigadier-General Edwin Vose Sumner arrived to command the Department of the Pacific.

17 July 1861: The Department of Utah was discontinued, and its territory incorporated into the Department of the Pacific.

September 14 1861: The District of Southern California was established in the Department of the Pacific, comprising California from San Francisco southwards.

20 October 1861: Brigadier-General George Wright was appointed to temporary command of the Department of the Pacific, arriving on 26 October 1861, to succeed Brigadier-General Edwin Vose Sumner.

26 October 1861: Brigadier-General George Wright arrived in temporary command of the Department of the Pacific, succeeding Brigadier-General Edwin Vose Sumner.

19 November 1861: Brigadier-General George Wright assumed full command of the Department of the Pacific after a period in temporary command.

12 December 1861: The District of the Humboldt was established in the Department of the Pacific, comprising Sonoma, Napa, Mendocino, Trinity, Humboldt, Klamath, and Del Norte counties in California.

6 August 1862: The District of Utah was established in the Department of the Pacific, comprising Utah Territory and Utah Territory.

4 March 1863: The territory of Idaho Territory was added to the District of Oregon.

20 August 1863: Soda Springs, Idaho Territory, transferred to the District of Utah.

21 May 1864: Major-General Irvin McDowell assumed command of the Department of the Pacific, succeeding Brigadier-General George Wright.

1 July 1864: The District of California was established in the Department of the Pacific, comprising the state of California.

20 January 1865: The Arizona Territory transferred from Department of New Mexico to the Department of the Pacific.

17 February 1865: The District of Utah transferred from the Department of the Pacific to the Department of the Missouri. It comprised Utah Territory and the state of Nevada, and Soda Springs, Idaho Territory.

7 March 1865: The District of Arizona was established in the Department of the Pacific, to comprise the Arizona Territory.

14 March 1865: The District of Oregon was extended to include the entire state of Oregon, including the Rogue and Umpqua River areas.

14 March 1865: The District of Arizona transferred from the Department of the Pacific to the Department of California.

27 June 1865: The Department of the Pacific was discontinued and incorporated into the Department of California and the Department of the Columbia.

Department of Utah

1 January 1861-17 July 1861

Philip St George Cooke 1 January 1861-17 July 1861

1 January 1861: The Department of Utah comprised Utah Territory east of 177 degrees west longitude. Headquarters were at Fort Crittenden.

1 January 1861: The Department of Utah was commanded by Colonel Philip St George Cooke.

17 July 1861: The Department of Utah was discontinued, and its territory incorporated into the Department of the Pacific.

Department of Arkansas

6 January 1864-1 August 1865

Frederick Steele 6 January 1864-21 March 1864

Nathan Kimball temporary 22 March 1864-21 May 1864

Frederick Steele 22 May 1864-21 December 1864

Joseph Jones Reynolds 22 December 1864-1 August 1865

6 January 1864: The Department of Arkansas was established. It comprised all of Arkansas except Fort Smith which remained part of the Department of Kansas. Its territory transferred from the Department of the Missouri.

6 January 1864: Major-General Frederick Steele was appointed to command the Department of Arkansas, arriving on 30 January 1864.

6 January 1864: The Army of Arkansas transferred from the Department of the Missouri to the Department of Arkansas.

6 January 1864: The District of Eastern Arkansas transferred from the Department of the Tennessee to the Department of Arkansas.

6 January 1864: The District of Northern Arkansas transferred from the Department of the Missouri to the Department of Arkansas.

6 January 1864: The District of the Frontier Arkansas transferred from the Department of the Missouri to the Department of Arkansas. It comprised the state of Arkansas west of Dardanelle, except for Fort Smith.

30 January 1864: Major-General Frederick Steele arrived to command the Department of Arkansas.

23 February 1864: The District of the Frontier Arkansas was discontinued, and renamed as the District of the Frontier in the Department of Arkansas.

22 March 1864: Brigadier-General Nathan Kimball assumed temporary command of the Department of Arkansas, succeeding Major-General Frederick Steele.

17 April 1864: The Department of Arkansas extended its authority over Fort Smith and the Indian Territory, which had formerly been controlled by the District of the Frontier of the Department of Kansas.

7 May 1864: The Department of Arkansas transferred to the Military Division of West Mississippi.

7 May 1864: Brigadier-General Nathan Kimball retained temporary command of the Department of Arkansas.

11 May 1864: The District of Little Rock was established in the Department of Arkansas.

22 May 1864: Major-General Frederick Steele assumed command of the Department of Arkansas, succeeding Brigadier-General Nathan Kimball.

1 June 1864: The District of Northern Arkansas was discontinued.

22 December 1864: Major-General Joseph Jones Reynolds assumed command of the Department of Arkansas, succeeding Major-General Frederick Steele.

1 February 1865: The District of the Frontier was discontinued.

4 February 1865: The District of Little Rock was discontinued.

21 March 1865: The Department of Arkansas transferred from the Military Division of West Mississippi to the Military Division of the Missouri.

21 March 1865: Major-General Joseph Jones Reynolds retained command of the Department of Arkansas.

22 April 1865: The District of South Kansas transferred from the Department of the Missouri to the Department of Arkansas. It comprised the vicinity of Fort Gibson, Indian Territory.

17 May 1865: The Department of Arkansas transferred from the Military Division of the Missouri to the Military Division of the Southwest.

17 May 1865: Major-General Joseph Jones Reynolds retained command of the Department of Arkansas.

3 June 1865: The District of South Kansas was discontinued.

5 June 1865: The District of Eastern Arkansas was discontinued.

27 June 1865: The Department of Arkansas transferred from the Military Division of the Southwest to the Military Division of the Mississippi.

27 June 1865: Major-General Joseph Jones Reynolds retained command of the Department of Arkansas.

1 August 1865: The Department of Arkansas was discontinued.

Department of Kansas #1

9 November 1861-19 March 1862

David Hunter 9 November 1861-11 March 1862

David Hunter 11 March 1862-18 March 1862, interim 18 March 1862-19 March 1862

9 November 1861: The Department of Kansas was established, with headquarters at Fort Leavenworth, comprising Kansas, Nebraska Territory, Colorado Territory, Dakota Territory, and the Indian Territory, taken from the Western Department.

9 November 1861: Major-General David Hunter was appointed to command the Department of Kansas, arriving on 20 November 1861.

20 November 1861: Major-General David Hunter arrived to command the Department of Kansas.

14 February 1862: Fort Garland in the Colorado territory transferred from the Department of Kansas to the Department of New Mexico.

19 March 1862: The Department of Kansas was discontinued, and its territory transferred to the District of Kansas.

Department of Kansas #2

2 May 1862-19 September 1862

James Gilpatrick Blunt 2 May 1862-19 September 1862

2 May 1862: The Department of Kansas was re-established from the former District of Kansas, comprising Kansas, Dakota Territory, Nebraska Territory, Indian Territory, and Colorado Territory except for Fort Garland.

2 May 1862: Brigadier-General James Gilpatrick Blunt was appointed to command the Department of Kansas, arriving on 5 May 1862.

5 May 1862: Brigadier-General James Gilpatrick Blunt arrived to command the Department of Kansas.

16 August 1862: The Army of Kansas was established in the Department of Kansas.

6 September 1862: The Department of the Northwest was established, comprising the states of Wisconsin, Iowa and Minnesota, and Nebraska Territory and Dakota Territory. The Dakota Territory and Nebraska Territory transferred from the Department of Kansas to the Department of the Northwest.

19 September 1862: Kansas and Indian Territory transferred from the Department of Kansas to the Department of the Missouri.

19 September 1862: The Army of Kansas was discontinued.

19 September 1862: The District of Colorado was established as an independent command reporting to the War Department, comprising the territory of the Colorado Territory taken from the discontinued Department of Kansas.

19 September 1862: The Department of Kansas was discontinued, and its territory incorporated into the Department of the Missouri.

Department of Kansas #3

1 January 1864-30 January 1865

Samuel Ryan Curtis 1 January 1864-19 April 1864

George Sykes 20 April 1864-30 January 1865

1 January 1864: The Department of Kansas was established, comprising Kansas, Nebraska Territory, Colorado Territory except Fort Garland, Indian Territory and Fort Smith in Arkansas, transferred from the Department of the Missouri.

1 January 1864: Major-General Samuel Ryan Curtis was appointed to command the Department of Kansas, arriving on 16 January 1864. The District of Nebraska Territory transferred from the Department of the Missouri to the Department of Kansas. It included the Nebraska Territory and Julesburg, Colorado Territory.

16 January 1864.The District of the Border transferred from the Department of the Missouri to the Department of Kansas.

6 January 1864: The District of the Frontier Kansas was established after the transfer of part of the District of the Frontier from the Department of the Missouri to the Department of Kansas. It comprised Fort Smith and the Indian Territory.

16 January 1864: Major-General Samuel Ryan Curtis arrived in command of the Department of Kansas.

23 February 1864: The District of the Frontier Kansas was discontinued, and incorporated into the District of the Frontier in the Department of Arkansas.

28 February 1864: The District of North Kansas was established in the Department of Kansas. It comprised the territory north of the Kansas River and Sokey Hill Fork, Kansas.

28 February 1864: The District of South Kansas was established in the Department of Kansas. It comprised Kansas south of the Kansas River and Smoky Hill Fork.

17 April 1864: The Department of Arkansas extended its authority over Fort Smith and the Indian Territory, which had formerly been controlled by the District of the Frontier of the Department of Kansas.

20 April 1864: Major-General George Sykes assumed command of the Department of Kansas, succeeding Major-General Samuel Ryan Curtis.

2 August 1864: The District of the Upper Arkansas was established in the Department of Kansas. It comprised the territory westward from Fort Riley, Kansas, to Fort Lyon, Colorado Territory.

15 October 1864: The Army of the Border was established in the Department of Kansas.

8 November 1864: The Army of the Border was discontinued.

30 January 1865: The District of Colorado Territory transferred from the Department of Kansas to the Department of the Missouri.

30 January 1865: The District of Nebraska Territory transferred from the Department of Kansas to the Department of the Missouri.

30 January 1865: The District of North Kansas transferred from the Department of Kansas to the Department of the Missouri.

30 January 1865: The District of South Kansas transferred from the Department of Kansas to the Department of the Missouri.

30 January 1865: The District of the Upper Arkansas transferred from the Department of Kansas to the Department of the Missouri.

30 January 1865: The District of the Border was discontinued.

30 January 1865: The Department of Kansas was discontinued, and its territory incorporated into the Department of the Missouri.

Department of the Missouri

9 November 1861–31 December 1865

David Hunter 9 November 1861-9 November 1861, interim 10 November 1861-19 November 1861

Henry Wager Halleck 9 November 1861-23 September 1862

Samuel Ryan Curtis 24 September 1862-12 March 1863 interim to 23 March 1863

John McAllister Schofield 13 March 1863-22 January 1864 interim to 29 January 1864

William Starke Rosecrans 30 January 1864-1 December 1864 interim to 8 December 1864

Grenville Mellen Dodge 2 December 1864-27 June 1865, interim 27 June 1865-21 July 1865

John Pope 21 July 1865-31 December 1865

9 November 1861: The Department of the Missouri was established, comprising Missouri, Iowa, Minnesota, Wisconsin, Illinois, and Arkansas taken from the Western Department and the Department of the East

9 November 1961: Kentucky west of the Cumberland River transferred to the Department of the Missouri from the Department of the Cumberland.

9 November 1861: The District of North Missouri was discontinued.

9 November 1861: The District of Southeast Missouri transferred from the Western Department to the Department of the Missouri, comprising the vicinity of Cairo, Illinois, and Ironton, Jefferson City and Cape Girardeau, Missouri.

9 November 1861: The District of Western Kentucky transferred from the Western Department to the Department of the Missouri.

9 November 1861: The Southern District of New Mexico transferred from the Western Department to the Department of New Mexico.

9 November 1861: Major-General Henry Wager Halleck was appointed to command the Department of the Missouri, arriving on 19 November 1861.

9 November 1861: Major-General David Hunter retained interim command of the Department of the Missouri.

19 November 1861: Major-General Henry Wager Halleck arrived to command the Department of the Missouri.

21 November 1861: The District of St Louis was established in the Department of the Missouri

26 November 1861: The District of North Missouri was established in the Department of the Missouri.

3 December 1861: The District of Central Missouri was established in the Department of the Missouri.

3 December 1861: The Army of Western Missouri was established in the District of Central Missouri.

23 December 1861: The District of Cairo was established in the Department of the Missouri.

25 December 1861: The District of Southwest Missouri was established in the Department of the Missouri.

25 December 1861: The Army of the Southwest “Army of Southwest Missouri” was established in the District of Southwest Missouri.

31 January 1862: The District of Western Kentucky was discontinued.

6 February 1862: The region of Western Tennessee transferred from the Department of the Ohio to the Department of the Missouri.

14 February 1862: The District of West Tennessee was established in the Department of the Missouri.

23 February 1862: The Army of the Mississippi was officially announced for the proposed Department of the Mississippi, to be formally established on March 1 1862.

23 February 1862: The District of the Mississippi was established in the Department of the Missouri.

27 February 1862: The Army of the Mississippi transferred to the District of the Mississippi.

12 March 1862: The District of Northeast Missouri was established in the Department of the Missouri.

12 March 1862: The District of Northwest Missouri was established in the Department of the Missouri.

1 April 1862: The Sub-District of Columbus was established in the District of Cairo.

2 May 1862: The District of Southeast Missouri transferred to the operational command of the District of Southwest Missouri.

11 May 1862: The District of Southeast Missouri was discontinued.

1 June 1862: The District of Central Missouri was discontinued, and incorporated into the District of Missouri.

1 June 1862: The District of Missouri was established in the Department of the Missouri.

4 June 1862: The District of St Louis was discontinued, and incorporated into the District of Missouri.

4 June 1862: The District of Northeast Missouri was discontinued, and incorporated into the District of Missouri.

19 September 1862: The Department of the Missouri was reorganised to comprise Missouri, Arkansas, Kansas, and the Indian Territory

19 September 1862: The Department of Kansas was discontinued, and its territory incorporated into the Department of the Missouri.

19 September 1862: Kansas and Indian Territory transferred from the Department of Kansas to the Department of the Missouri.

19 September 1862: Alton, Illinois, transferred from the Department of the Ohio to the Department of the Missouri.

19 September 1862: The District of St Louis was established in the Department of the Missouri.

19 September 1862: The Army of the Southwest transferred from the District of Southwest Missouri to the Department of the Missouri.

24 September 1862: Major-General Samuel Ryan Curtis assumed command of the Department of the Missouri, succeeding Major-General Henry Wager Halleck.

26 September 1862: The District of Missouri was discontinued, and its territory transferred to the District of Central Missouri.

26 September 1862: The District of Central Missouri was established in the Department of the Missouri.

27 September 1862: The District of Northeast Missouri was established in the Department of the Missouri, from the District of Missouri.

1 October 1862: The Army of Southwestern Missouri was established in the Department of the Missouri.

11 October 1862: The District of Colorado apart from Fort Garland transferred to the Department of the Missouri.

12 October 1862: The Army of Southwestern Missouri was discontinued, and incorporated into the Army of the Frontier.

12 October 1862: The Army of the Frontier was established in the Department of the Missouri, comprising the field forces of the former Army of Kansas and the Army of Southwestern Missouri.

2 November 1862: The District of Colorado was renamed as the District of Colorado Territory.

2 November 1862: The District of Eastern Arkansas was established in the Department of the Missouri.

2 November 1862: The District of Nebraska Territory was established in the Department of the Missouri.

2 November 1862: The District of Rolla was established in the Department of the Missouri.

3 December 1862: The Army of Southeastern Missouri was established in the Department of the Missouri.

12 December 1862: The Army of the Southwest was discontinued.

1 January 1863: The District of Colorado Territory was discontinued in the Department of the Missouri.

19 January 1863: Portions of Arkansas transferred temporarily from the Department of the Missouri to the Department of the Tennessee.

13 March 1863: Brigadier-General John McAllister Schofield was appointed to command the Department of the Missouri, arriving on 24 March 1863, succeeding Major-General Samuel Ryan Curtis.

24 March 1863: Brigadier-General John McAllister Schofield arrived to command the Department of the Missouri, succeeding Major-General Samuel Ryan Curtis.

26 March 1863: The Army of Southeastern Missouri was discontinued.

30 March 1863: The District of Southwest Missouri was extended southwards to the Arkansas River.

30 March 1863: The District of St Louis was reduced in territory.

9 June 1863: The District of the Border was established in the Department of the Missouri. The District of the Frontier was established in the Department of the Missouri.

16 June 1863: The District of Southeast Missouri was established in the Department of the Missouri.

6 July 1863: The District of Northwest Missouri was discontinued, and incorporated into the District of North Missouri.

6 July 1863: The District of North Missouri was established in the Department of the Missouri.

15 July 1863: The counties of Vernon, Barton, Jasper, Newton, and McDonald transferred from the District of the Frontier to the District of Southwest Missouri.

25 July 1863: The Army of Arkansas was established in the Department of the Missouri.

7 August 1863: The Army of the Frontier was discontinued.                                    

30 November 1863: The District of Southeast Missouri was discontinued, and its territory transferred to the District of St Louis.

30 November 1863: The District of Northern Arkansas also known as the District of Northeastern Arkansas was established in the Department of the Missouri.

1 January 1864: The District of Nebraska Territory transferred from the Department of the Missouri to the Department of Kansas.

6 January 1864: The District of Northern Arkansas transferred from the Department of the Missouri to the Department of Arkansas.

6 January 1864: The District of the Frontier transferred from the Department of the Missouri and was divided into two parts: the District of the Frontier Kansas in the Department of Kansas; and the District of the Frontier Arkansas in the Department of Arkansas.

22 January 1864: Major-General William Starke Rosecrans was appointed to command the Department of the Missouri, arriving on 30 January 1864.

30 January 1864: Major-General William Starke Rosecrans arrived to command the Department of the Missouri, succeeding Major-General McAllister Schofield.

7 February 1864: The District of Northeast Missouri was discontinued in the Department of the Missouri.

15 February 1864: Alton, Illinois, transferred from the Northern Department to the Department of the Missouri.

27 May 1864: The Department of the Missouri transferred to the Military Division of West Mississippi.

27 May 1864: Major-General William Starke Rosecrans retained command of the Department of the Missouri.

18 August 1864: The southern border of the District of Southwest Missouri was redefined as the Missouri-Arkansas state line.

2 December 1864: Major-General Grenville Mellen Dodge was appointed to command the Department of the Missouri, arriving on 9 December 1864, to succeed Major-General William Starke Rosecrans.

9 December 1864: Major-General Grenville Mellen Dodge arrived to command the Department of the Missouri, succeeding Major-General William Starke Rosecrans.

26 December 1864: The northern border of the District of Southwest Missouri was re-defined as the Osage River.

30 January 1865: The Military Division of the Missouri was established. It included the Department of the Northwest and the Department of the Missouri.

30 January 1865: The Department of the Missouri transferred from the Military Division of West Mississippi to the Military Division of the Missouri.

30 January 1865: Major-General Grenville Mellen D0dge retained command of the Department of the Missouri.

30 January 1865: The District of Colorado Territory transferred from the Department of Kansas to the Department of the Missouri.

30 January 1865: The District of Nebraska Territory transferred from the Department of Kansas to the Department of the Missouri.

30 January 1865: The District of North Kansas transferred from the Department of Kansas to the Department of the Missouri.

30 January 1865: The District of South Kansas transferred from the Department of Kansas to the Department of the Missouri.

30 January 1865: The District of the Upper Arkansas transferred from the Department of Kansas to the Department of the Missouri.

16 February 1865: Montana Territory and the part of Dakota Territory west of 100 degrees longitude transferred from the Department of the Northwest to the Department of the Missouri.

17 February 1865: The District of Utah transferred from the Department of the Pacific to the Department of the Missouri.

28 March 1865: The District of Utah was discontinued, and its territory incorporated into the District of the Plains.

28 March 1865: The District of Colorado Territory was discontinued, and its territory incorporated into the District of the Plains.

28 March 1865: The District of Nebraska Territory was discontinued, and its territory incorporated into the District of the Plains.

22 April 1865: The District of South Kansas transferred from the Department of the Missouri to the Department of Arkansas.

22 April 1865: Fort Lyon, Colorado Territory, transferred from the District of the Plains to the District of the Upper Arkansas.

25 May 1865: The District of the Plains was discontinued.

27 May 1865: The District of North Kansas was discontinued.

27 June 1865: The Military Division of the Mississippi was reorganised to consist of the Department of the Ohio, the Department of the Missouri, and the Department of Arkansas.

27 June 1865: The Department of the Missouri transferred to the Military Division of the Mississippi.

27 June 1865: Alton, Illinois, transferred from the Department of the Missouri to the Department of the Ohio.

27 June 1865: Fort Garland, Arkansas, transferred from the Department of New Mexico to the Department of the Missouri.

27 June 1865: Major-General John Pope was appointed to command of the Department of the Missouri, arriving on 21 July 1865.

27 June 1865: Major-General Grenville Mellen Dodge retained interim command of the Department of the Missouri. 27 June 1865: The Department of the Northwest was discontinued, and its territory incorporated into the Department of the Missouri.

27 June 1865: The District of Minnesota transferred from the Department of the Northwest to the Department of the Missouri.

27 June 1865: The Department of New Mexico was discontinued, and its territory transferred to the Department of California and the Department of the Missouri.

1 July 1865: The District of North Missouri was discontinued.

10 July 1865: The District of Central Missouri was discontinued.

10 July 1865: The District of Rolla was discontinued.

10 July 1865: The District of Southwest Missouri was discontinued.

10 July 1865: The District of St Louis was discontinued.

10 July 1865: The District of the Upper Arkansas was discontinued.

10 July 1865: The District of Missouri was established in the Department of the Missouri. It consisted of the territories previously in the District of St Louis, the District of Central Missouri and the District of Rolla.

21 July 1865: Major-General John Pope arrived to command the Department of the Missouri, succeeding Major-General Grenville Mellen Dodge.

22 August 1865: The District of Missouri was discontinued.

30 October 1865: The state of Wisconsin transferred from the Department of the Missouri to the Department of the Ohio.

Department of the Northwest

6 September 1862-27 June 1865

John Pope 6 September 1862-27 November 1862

Washington Lafayette Elliott temporary 28 September 1862-12 February 1863 interim to 27 February 1863

John Pope 13 February 1863-19 February 1865

Samuel Ryan Curtis 30 January 1865-27 June 1865

6 September 1862: The Department of the Northwest was established, comprising the states of Wisconsin, Iowa and Minnesota, and Nebraska Territory and Dakota Territory. Headquarters were at Madison, and later at Milwaukee, Wisconsin.

6 September 1862: The states of Minnesota and Iowa were detached from the Department of the Mississippi. Wisconsin was taken from the Department of the Ohio.

6 September 1862: Dakota Territory and Nebraska Territory transferred from the Department of Kansas to the Department of the Northwest.

6 September 1862: Major-General John Pope was appointed to command of the Department of the Northwest, arriving on 16 September 1862.

16 September 1862: The District of Wisconsin was established in the Department of the Northwest, comprising the state of Wisconsin.

16 September 1862: Major-General John Pope arrived to command the Department of the Northwest.

17 November 1862: The Department of the Northwest was divided into the First District, Second District, Third District and Fourth District.

17 November 1862: The First District of the Department of the Northwest was established. It comprised Iowa and the Dakota Territory.

17 November 1862: The Second District of the Department of the Northwest was established. It comprised the vicinity of Fort Snelling, Minnesota.

17 November 1862: The Third District of the Department of the Northwest was established. It comprised the vicinity of Fort Ripley, Minnesota.

17 November 1862: The Fourth District of the Department of the Northwest was established. It comprised the vicinity of Fort Abercrombie, Minnesota.

23 November 1862: The Second District of the Department of the Northwest was discontinued, and renamed the District of Minnesota.

23 November 1862: The District of Minnesota was established in the Department of the Northwest, from Second District, Third District and Fourth District of the Department of the Northwest, including Fort Snelling, Fort Ridgely, and Fort Abercrombie.

27 November 1862: The Third District of the Department of the Northwest was discontinued.

27 November 1862: The Fourth District of the Department of the Northwest was discontinued.

28 November 1862: Brigadier-General Washington Lafayette Elliott assumed temporary command of the Department of the Northwest, succeeding Major-General John Pope.

13 February 1863: Major-General John Pope assumed command the Department of the Northwest, arriving on 28 February 1863, to succeed Brigadier-General Washington Lafayette Elliott.

28 February 1863: Major-General John Pope arrived to resume command of the Department of the Northwest, succeeding Brigadier-General Washington Lafayette Elliott.

1 June 1863: The District of Dakota was established in the Department of the Northwest, comprising the Dakota Territory. The First District of the Department of the Northwest was discontinued.

8 June 1863: The District of Iowa was established in the Department of the Northwest, comprising the state of Iowa.

4 December 1863: The District of Dakota was discontinued, and its territory incorporated into the District of Iowa.

26 May 1864: Montana Territory was attached to the Department of the Northwest.

12 November 1864: The District of Iowa was discontinued.

30 January 1865: The Military Division of the Missouri was established. It included the Department of the Northwest and the Department of the Missouri.

30 January 1865: The Department of the Northwest was subordinated to the Military Division of the Missouri.

30 January 1865: Major-General John Pope retained interim command of the Department of the Northwest, pending the arrival of Major-General Samuel Ryan Curtis.

30 January 1865: Major-General Samuel Ryan Curtis was appointed to command the Department of the Northwest, arriving on 17 February 1865.

16 February 1865: Montana Territory and the part of Dakota Territory west of 100 degrees longitude transferred from the Department of the Northwest to the Department of the Missouri.

19 February 1865: Major-General Samuel Ryan Curtis arrived to command the Department of the Northwest.

27 June 1865: The District of Wisconsin was discontinued.

27 June 1865: The District of Minnesota transferred from the Department of the Northwest to the Department of the Missouri.

27 June 1865: The Department of the Northwest was discontinued, and its territory incorporated into the Department of the Missouri.

Department of the West

1 January 1861-3 July 1861

William Selby Harney 1 January 1861–22 April 1861

Nathaniel Lyon temporary de facto 22 April 1861-28 April 1861

Edmund Brooke Alexander temporary 29 April 1861-10 May 1861

William Selby Harney 11 May 1861-30 May 1861

Nathaniel Lyon 31 May 1861-3 July 1861

1 January 1861: The Department of the West comprised the country west of the Mississippi River and east of the Rocky Mountains, except for Texas, Utah Territory and New Mexico Territory. It included Missouri, Arkansas, Iowa, Minnesota, Kansas Territory, Nebraska Territory, Indian Territory and Louisiana west of the Mississippi River. Headquarters were at St Louis.

1 January 1861: The Department of the West was commanded by Brigadier-General USA William Selby Harney

28 February 1861: Colorado Territory was incorporated into the Department of the West.

23 April 1861: Captain Nathaniel Lyon assumed temporary de facto command of the Department of the West.

29 April 1861: Colonel Edmund Brooke Alexander assumed temporary command of the Department of the West, succeeding Captain Nathaniel Lyon.

11 May 1861: Brigadier-General William Selby Harney assumed command of the Department of the West.

31 May 1861: Brigadier-General Nathaniel Lyon assumed command of the Department of the West, succeeding Brigadier-General William Selby Harney.

6 June 1861: The state of Missouri transferred from the Department of the West to the Department of the Ohio.

2 July 1861: The Army of the West was established in the Department of the West.

3 July 1861: The Department of the West was discontinued, and incorporated into the Western Department.

Western Department

3 July 1861-9 November 1861

Nathaniel Lyon 3 July 1861-24 July 1861

John Charles Frémont 25 July 1861-1 November 1861

David Hunter 2 November 1861-9 November 1861

3 July 1861: The Western Department was established, with headquarters at St Louis, Missouri, comprising Arkansas, Iowa, Minnesota, Kansas, Nebraska Territory, Colorado Territory, Dakota Territory, and Indian Territory from the discontinued Department of the West; Missouri and Illinois were taken from the Department of the Ohio; New Mexico Territory was taken from the discontinued Department of New Mexico. Missouri and Illinois transferred from the Department of the Ohio to the Western Department.

3 July 1861: The Department of New Mexico was discontinued, and its territory incorporated into the Western Department.

3 July 1861: The Army of the West transferred from the Department of the West to the Western Department.

3 July 1861: Major-General John Charles Frémont was appointed to command the Western Department, arriving on 25 July 1861.

3 July 1861: Brigadier-General Nathaniel Lyon retained interim command of the Western Department.

5 July 1861: The states of Missouri and Illinois transferred from the Department of the Ohio to the Western Department. The District of Ironton was established in the Western Department, comprising the territory around Ironton, Missouri.

25 July 1861: Major-General John Charles Frémont arrived to command the Western Department, succeeding Brigadier-General Nathaniel Lyon.

29 July 1861: The District of North Missouri was established in the Western Department, comprising the territory of Hannibal, Mexico, Warrenton and Renick, Missouri.

8 August 1861: The Southern District of New Mexico was established in the Western Department, comprising all the New Mexico Territory south of Albuquerque.

10 August 1861: The Army of the West was discontinued.

15 August 1861: Western Kentucky transferred from the discontinued Department of Kentucky to the Western Department.

1 September 1861: The District of Ironton was discontinued.

1 September 1861: The District of Southeast Missouri was established in the Western Department, comprising Bird’s Point, Missouri and Cairo and Mound City, Illinois.

8 September 1861: The District of Western Kentucky was established in the Western Department.

24 September 1861: The Western Army was established in the Western Department.

24 October 1861: Major-General David Hunter was appointed conditionally to command the Western Department, with discretionary orders to relieve the incumbent Major-General John Charles Frémont. The Western Army was discontinued.

2 November 1861: Major-General David Hunter assumed command of the Western Department, succeeding Major-General John Charles Frémont.

9 November 1861: The Western Department was discontinued, and its territory divided between the Department of New Mexico, the Department of the Missouri, and the Department of Kansas.

Department of Alabama

27 June 1865-31 December 1865

Charles Robert Woods 27 June 1865-31 December 1865

27 June 1865: The Department of Alabama was established and subordinated to the Military Division of the Tennessee, comprising the state of Alabama.

27 June 1865: The Department of the Gulf was discontinued, and its territory incorporated into the Department of Louisiana, the Department of Mississippi, the Department of Alabama, the Department of Florida, and the Department of Texas.

27 June 1865: Brigadier-General Charles Robert Woods was appointed to command the Department of Alabama, arriving on 18 July 1865.

27 June 1865: The District of Northern Alabama transferred to the Department of Alabama.

18 July 1865: Brigadier-General Charles Robert Woods arrived to command the Department of Alabama.

Department of the Cumberland #1

15 August 1861-9 November 1861

Robert Anderson 15 August 1861-6 October 1861 interim 8 October 1861

William Tecumseh Sherman 6 October 1861-9 November 1861

15 August 1861: The Department of the Cumberland was established, comprising the states of Tennessee and Kentucky except for the territory occupied by forces of the Western Department at the junction of Tennessee, Cumberland Ohio, and Mississippi rivers.

15 August 1861: Brigadier-General Robert Anderson was appointed to command the Department of the Cumberland, arriving on 24 September 1861.

19 September 1861: The territory of Kentucky within 15 miles of Cincinnati transferred from the Department of the Cumberland to the Department of the Ohio.

24 September 1861: Brigadier-General Robert Anderson arrived to command the Department of the Cumberland.

6 October 1861: Brigadier-General William Tecumseh Sherman was appointed to command the Department of the Cumberland, arriving on 8 October 1861.

8 October 1861: Brigadier-General William Tecumseh Sherman arrived to command the Department of the Cumberland, succeeding Brigadier-General Robert Anderson.

9 November 1861: The Department of the Cumberland was discontinued, and its territory divided between the Department of the Missouri and the Department of the Ohio. The parts of Tennessee west of the Cumberland River transferred from the Department of the Cumberland to the Department of the Ohio.

Department of the Cumberland #2

24 October 1862-27 June 1865

William Starke Rosecrans 24 October 1862-17 October 1863 interim 20 October 1863

George Henry Thomas 17 October 1863-27 June 1865

24 October 1862: The Department of the Cumberland was re-established, comprising Tennessee east of the Tennessee River excluding Fort Henry and Fort Donelson and the territory around Cumberland Gap formerly in the District of the Ohio. The portions of Alabama and Georgia were also added to its territory as they came under military control.

24 October 1862: Major-General William Starke Rosecrans was appointed to command the Department of the Cumberland, arriving on 30 October 1862.

24 October 1862: The Army of the Cumberland was established in the Department of the Cumberland.

30 October 1862: Major-General William Starke Rosecrans arrived to command the Department of the Cumberland.

25 September 1863: Hooker’s Command Cumberland was established in the Department of the Cumberland, comprising XI Corps Cumberland and XII Corps Cumberland.

16 October 1863: The Department of the Cumberland was subordinated to the Military Division of the Mississippi.

16 October 1863: Major-General William Starke Rosecrans retained command of the Department of the Cumberland.

17 October 1863: Major-General George Henry Thomas was appointed to command the Department of the Cumberland, arriving on 20 October 1863.

10 November 1863: The District of Nashville was established in the Department of the Cumberland.

16 November 1863: The territory in eastern Tennessee which was occupied by troops of the Army of the Ohio transferred from the Department of the Cumberland to the Department of the Ohio.

24 November 1863: Fort Henry and Fort Donelson transferred from the Department of the Tennessee to the Department of the Cumberland.

14 April 1864: Hooker’s Command Cumberland was discontinued, and its force incorporated into the reorganised XX Corps Cumberland.

30 May 1864: The District of Nashville was discontinued, and its territory transferred to the District of Tennessee.

30 May 1864: The District of Tennessee was established in the Department of the Cumberland.

2 June 1864: The District of Northern Alabama was established in the Department of the Cumberland.

15 June 1864: The District of Etowah was established in the Department of the Cumberland.

17 January 1865: The Department of the Ohio was discontinued, and its territory transferred to the Department of the Cumberland.

17 January 1865: The District of East Tennessee transferred from the Department of the Ohio to the Department of the Cumberland.

17 January 1865: The District of Kentucky transferred from the Department of the Ohio to the Department of the Cumberland.

17 January 1865: The territories of Georgia, Alabama and Mississippi controlled by the Army of the Cumberland transferred from the Department of the Mississippi to the Department of the Cumberland.

10 February 1865: The District of Kentucky was discontinued, and its territory incorporated into the Department of Kentucky.

10 February 1865: The District of West Tennessee transferred from the Department of the Mississippi to the Department of the Cumberland.

28 February 1865: The District of Tennessee was discontinued, and its territory transferred to the District of Middle Tennessee.

28 February 1865: The District of Middle Tennessee was established in the Department of the Cumberland.

17 March 1865: The District of East Tennessee was discontinued.

17 May 1865: The parts of Mississippi and Alabama previously occupied by the Army of the Cumberland and temporarily controlled by the Department of the Cumberland transferred to the Department of the Gulf.

25 May 1865: The District of West Tennessee was discontinued.

20 June 1865: The District of Etowah was discontinued.

27 June 1865: The Army of the Cumberland transferred from the Department of the Cumberland to the Military Division of the Mississippi.

27 June 1865: The District of Northern Alabama transferred from the Department of the Cumberland to the Department of Alabama.

27 June 1865: The District of Middle Tennessee was discontinued.

27 June 1865: The Department of the Cumberland was discontinued.

Department of Kentucky #1

28 May 1861-15 August 1861

Robert Anderson 28 May 1861-15 August 1861

28 May 1861: The Department of Kentucky was established, comprising that territory of the state within 100 miles of the Ohio River, detached from the Department of the East.

28 May 1861: Brigadier-General Robert Anderson assumed command of the Department of Kentucky.

15 August 1861: Western Kentucky transferred from the Department of Kentucky to the Western Department.

15 August 1861: The Department of Kentucky was discontinued, and most of its territory transferred to the Department of the Cumberland.

Department of Kentucky #2

10 February 1865-31 December 1865

John McAuley Palmer 10 February 1865-1 May 1865

Edward Henry Hobson 1 May 1865-31 December 1865

10 February 1865: The Department of Kentucky was established in the Military Division of the Mississippi. It comprised the state of Kentucky transferred from Department of Cumberland and the Northern Department.

10 February 1865: The territory around Covington transferred from the Northern Department to the Department of Kentucky.

10 February 1865: The District of Western Kentucky was established in the Department of Kentucky.

10 February 1865: Major-General John McAuley Palmer was appointed to command the Department of Kentucky, arriving on 18 February 1865.

18 February 1865: Major-General John McAuley Palmer arrived to take command of the Department of Kentucky.

1 May 1865: Brigadier-General Edward Henry Hobson assumed temporary command of the Department of Kentucky, succeeding Major-General John McAuley Palmer.

21 May 1865: The District of Western Kentucky was discontinued.

27 June 1865: The Department of Kentucky transferred from the Military Division of the Mississippi to the Military Division of the Tennessee.

27 June 1865: Major-General John McAuley Palmer assumed command of the Department of Kentucky, succeeding Brigadier-General Edward Henry Hobson.

Department of Mississippi

27 June 1865-31 December 1865

Henry Warner Slocum 27 June 1865-16 September 1865 interim 18 September 1865

Peter Joseph Osterhaus 16 September 1865-14 November 1865

Thomas John Wood 14 November 1865-31 December 1865

27 June 1865: The Department of Mississippi was established in the Military Division of the Gulf.

27 June 1865: Major-General Henry Warner Slocum was appointed to command the Department of Mississippi, arriving on 14 July 1865.

27 June 1865: The Northern District of Mississippi was established in the Department of Mississippi.

14 July 1865. The Southern District of Mississippi was established in the Department of Mississippi.

14 July 1865. The Western District of Mississippi was established in the Department of Mississippi.

14 July 1865: Major-General Henry Warner Slocum arrived to command the Department of Mississippi.

16 September 1865: Major-General Peter Joseph Osterhaus was appointed to command the Department of Mississippi, arriving on September 18 1865.

18 September 1865: Major-General Peter Joseph Osterhaus arrived to command the Department of Mississippi, succeeding Major-General Henry Warner Slocum.

7 October 1865: The Department of Mississippi transferred from the Military Division of the Gulf to the Military Division of the Tennessee

7 October 1865: Major-General Peter Joseph Osterhaus retained command of the Department of Mississippi.

14 November 1865: Major-General Thomas John Wood assumed command of the Department of Mississippi, succeeding Major-General Peter Joseph Osterhaus.

Department of the Mississippi #1

11 March 1862-19 September 1862

Henry Wager Halleck 11 March 1862-19 September 1862

Ulysses Simpson Grant interim de facto 11 July 1862-22 July 1862, de facto 22 July 1862-19 September 1862

11 March 1862: The Department of the Mississippi was established from parts of Department of Kansas, Department of the Ohio, and Department of the Mississippi. Headquarters were established at St Louis, Missouri.

11 March 1862: The territory of Kansas, Nebraska Territory, Colorado Territory except Fort Garland in Dakota Territory, and the Indian Territory transferred to the Department of the Mississippi from the Department of Kansas.

11 March 1862: Wisconsin, Missouri, Illinois, western Kentucky, western Tennessee, Arkansas, Minnesota, and Iowa transferred to the Department of the Mississippi from the Department of the Missouri

11 March 1862: Western Michigan, Indiana, and western Ohio transferred to the Department of the Mississippi from the Department of Ohio.

11 March 1862: Major-General Henry Wager Halleck assumed command of the Department of the Mississippi, arriving on 13 March 1862.

13 March 1862: Major-General Henry Wager Halleck arrived to command the Department of the Mississippi.

19 March 1862: The District of Kansas was established in the Department of the Mississippi, comprising the discontinued Department of Kansas.

19 March 1862: The District of the Ohio was established in the Department of the Mississippi.

2 May 1862: The District of Kansas was discontinued.

2 May 1862: The Department of Kansas was re-established and detached from the Department of the Mississippi, comprising Kansas, Dakota Territory, Nebraska Territory, Indian Territory and Colorado Territory except for Fort Garland.

8 June 1862: The territories of Eastern Kentucky and eastern Tennessee transferred from the Mountain Department to the Department of the Mississippi.

26 June 1862: The Army of the Mississippi transferred from the Department of the Mississippi to the District of the West Tennessee.

1 July 1862: The District of Corinth was established in the Department of the Mississippi.

11 July 1862: Major-General Henry Wager Halleck was appointed General-in-Chief of the United States Army, arriving on 23 July 1862. He retained nominal command of the Department of the Mississippi.

11 July 1862: Major-General Ulysses Simpson Grant assumed de facto command of the Department of the Mississippi, pending the departure of Major-General Henry Wager Halleck.

16 July 1862: The District of the Ohio transferred from the Department of the Mississippi to report directly to the War Department.

19 August 1862: The District of Cairo was discontinued.

6 September 1862: The Department of the Northwest was established, comprising the states of Wisconsin, Iowa and Minnesota, and Nebraska Territory, and Dakota Territory. The states of Minnesota and Iowa transferred from the Department of the Mississippi to the Department of the Northwest.

19 September 1862: The Department of the Missouri transferred from the Department of the Mississippi to the War Department.

19 September 1862: The Army of West Tennessee transferred from the Department of the Mississippi to the District of West Tennessee.

19 September 1862: The Army of the Mississippi transferred from the Department of the Mississippi to the Department of the Missouri.

19 September 1862: The Department of the Mississippi was discontinued.

Department of the Mississippi #2

28 November 1864-5 June 1865

Napoleon Jackson Tecumseh Dana 28 November 1864-30 April 1865 interim to 13 May 1865

Gouverneur Kemble Warren 1 May 1865-5 June 1865

28 November 1864: The Department of the Mississippi was established in the Military Division of West Mississippi. It comprised the state of Mississippi and the parts of Tennessee west of the Tennessee River taken from the discontinued Department of the Tennessee.

28 November 1864: The District of Vicksburg transferred from the Department of the Tennessee to the Department of the Mississippi.

28 November 1864: The District of West Tennessee transferred from the Department of the Tennessee to the Department of the Mississippi.

28 November 1864: Brigadier-General Napoleon Jackson Tecumseh Dana was appointed to command the Department of the Mississippi, arriving on 8 December 1864.

8 December 1864: Brigadier-General Napoleon Jackson Tecumseh Dana arrived to command the Department of the Mississippi.

3 January 1865: The District of Natchez was established in the Department of the Mississippi, comprising the territories east and west of the Mississippi River north of the Red River and south of the 32 parallel.

17 January 1865: The territories of Georgia, Alabama and Mississippi controlled by the Army of the Cumberland transferred from the Department of the Mississippi to the Department of the Cumberland.

10 February 1865: The District of West Tennessee transferred from the Department of the Mississippi to the Department of the Cumberland. It comprised the territory of Tennessee west of the Tennessee River.

1 May 1865: Major-General Gouverneur Kemble Warren was appointed to command the Department of the Mississippi, arriving on 14 May 1865.

14 May 1865: Major-General Gouverneur Kemble Warren arrived to command the Department of the Mississippi, succeeding Major-General Napoleon Jackson Tecumseh Dana.

17 May 1865: The District of Mississippi was established in the Department of Gulf, comprising the state of Mississippi transferred from the Department of the Mississippi.

3 June 1865: The District of Natchez was discontinued.

5 June 1865: The District of Vicksburg transferred from the Department of the Mississippi to the Department of the Gulf.

5 June 1865: The Department of the Mississippi was discontinued.

Northern Department

12 January 1864-27 June 1865

Samuel Peter Heintzelman 12 January 1864-28 September 1864 interim 1 October 1864

Joseph Hooker 28 September 1864-27 June 1865

12 January 1864: The Northern Department or Department of the North was established, comprising the states of Michigan, Ohio, Indiana, and Illinois. Headquarters were at Columbus, Ohio.

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

12 January 1864: Cairo, Illinois, transferred from the Department of the Tennessee to the Northern Department.

12 January 1864: The states of Ohio, Michigan, Indiana, and Illinois transferred from the Department of the Ohio to the Northern Department.

12 January 1864: The District of Indiana was established in the Northern Department.

12 January 1864: Major-General Samuel Peter Heintzelman was appointed to command the Northern Department, arriving on 20 January 1864.

20 January 1864: Major-General Samuel Peter Heintzelman arrived to command the Northern Department.

25 January 1864: Cairo, Illinois, transferred from the Northern Department to the District of Cairo in the Department of the Tennessee.

8 February 1864: Jeffersonville, Indiana, transferred from the Northern Department to the Department of the Ohio.

15 February 1864: Alton, Illinois, transferred back from the Northern Department to the Department of the Missouri.

25 June 1864: Covington, Kentucky, and the territory surrounding within ten miles transferred from the Department of the Ohio to the Northern Department.

13 August 1864: The District of Illinois was established in the Northern Department, comprising the state of Illinois.

28 September 1864: Major-General Joseph Hooker was appointed to command the Northern Department, arriving on 1 October 1864, to succeed Major-General Samuel Peter Heintzelman.

1 October 1864: Major-General Joseph Hooker arrived to command the Northern Department, succeeding Major-General Samuel Peter Heintzelman.

1 October 1864: The District of Michigan was established in the Northern Department.

24 November 1864: Cairo, Illinois, transferred from the Department of the Tennessee to the Northern Department.

10 February 1865: The territory around Covington transferred from the Northern Department to the Department of Kentucky.

10 February 1865: The territory around Jeffersonville, Indiana, transferred from the Department of the Cumberland to the Northern Department.

27 June 1865: The District of Illinois was discontinued.

27 June 1865: The District of Indiana was discontinued.

27 June 1865: The District of Michigan was discontinued.

27 June 1865: The Northern Department was discontinued, and its territory incorporated into the Department of the Ohio.

Department of the Ohio #1

3 May 1861-11 March 1862

George Brinton McClellan 3 May 1861-22 July 1861

William Starke Rosecrans 23 July 1861-20 September 1861

Ormsby McKnight Mitchel 21 September 1861-9 November 1861 interim 14 November 1861

Don Carlos Buell 10 November 1861-11 March 1862

3 May 1861: The Department of the Ohio was established, comprising Illinois, Ohio, and Indiana transferred from the Department of the East.

3 May 1861: Ohio State Major-General George Brinton McClellan was appointed to command the Department of the Ohio, arriving on 13 May 1861.

8 May 1861: The parts of Pennsylvania and Virginia north of the Kanawha River, north and west of the Greenbrier River and thence on a line northwest to the southwest boundary of Maryland transferred from the Department of the East to the Department of the Ohio.

9 May 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.

13 May 1861: Ohio State Major-General George Brinton McClellan arrived to command the Department of the Ohio.

6 June 1861: The state of Missouri transferred temporarily from the Department of the West to the Department of the Ohio.

14 June 1861: The Army of Occupation was established in western Virginia in the Department of the Ohio.

5 July 1861: The states of Missouri and Illinois transferred from the Department of the Ohio to the Western Department.

23 July 1861: Brigadier-General William Starke Rosecrans assumed command of the Department of the Ohio, succeeding Major-General George Brinton McClellan.

24 July 1861: The Cheat Mountain District was established in the Department of the Ohio, comprising the vicinity of Cheat Mountain, Virginia.

25 July 1861: All the parts of Pennsylvania in the Department of the Ohio transferred to the Department of Pennsylvania.

25 July 1861: The Cheat River District was established in the Department of the Ohio, comprising the territories of Tygart’s Valley and the Cheat River in Virginia.

3 August 1861: The District of Grafton was established in the Department of the Ohio, comprising the line of the Baltimore & Ohio Railroad from Cumberland, Maryland, to Wheeling, Virginia, and the Northwestern Virginia Railroad from Grafton to Parkersburg, Virginia.

4 September 1861: The Cheat River District was discontinued.

19 September 1861: The Department of the Ohio was reorganised to include Ohio, Indiana, and the territory of Kentucky within 15 miles of Cincinnati, Ohio.

19 September 1861: The territory of Kentucky within 15 miles of Cincinnati transferred from the Department of the Cumberland to the Department of the Ohio.

19 September 1861: The states of Ohio and Indiana transferred to the Department of the Ohio.

19 September 1861: The territory of Kentucky within 15 miles of Cincinnati transferred from the Department of the Cumberland to the Department of the Ohio.

19 September 1861: Brigadier-General Ormsby McKnight Mitchel was appointed to command the Department of the Ohio, arriving on 21 September 1861, to succeed Major-General William Starke Rosecrans.

19 September 1861: The Department of Western Virginia was established, comprising Virginia west of the Blue Ridge Mountains, with its territory was taken from the Department of the East and the Department of the Ohio.

19 September 1861: The Army of Occupation Ohio was discontinued.

19 September 1861: The Cheat Mountain District was discontinued.

21 September 1861: Brigadier-General Ormsby McKnight Mitchel assumed command of the Department of the Ohio, succeeding Major-General William Starke Rosecrans.

9 November 1861: The Army of the Ohio was established in the Department of the Ohio.

15 November 1861: Brigadier-General Don Carlos Buell arrived to command the Department of the Ohio.

20 December 1861: The District of Grafton was discontinued, and its territory transferred to the Railroad District in the Department of Western Virginia.

6 February 1862: The region of Western Tennessee transferred from the Department of the Ohio to the Department of the Missouri.

11 March 1862: The Army of the Ohio transferred from the Department of the Ohio to the Department of the Mississippi

11 March 1862: The Department of the Ohio was discontinued.

Department of the Ohio #2

19 August 1862-17 January 1865

Horatio Gouverneur Wright 19 August 1862-25 March 1863

Ambrose Everett Burnside 25 March 1863-9 December 1863

John Gray Foster 9 December 1863-26 January 1864 interim 9 February 1864

John McAllister Schofield 26 January 1864-8 November 1864 interim 17 November 1864

George Stoneman temporary 17 November 1864-17 January 1865

19 August 1862: The Department of the Ohio was established, comprising Illinois, Indiana, western Ohio, western Michigan, Wisconsin, Missouri and Tennessee and Kentucky east of the Tennessee River, including the Cumberland Gap in Tennessee. Headquarters were at Cincinnati. These territories were detached from the Department of the Mississippi, the Department of the Potomac, and the Mountain Department.

19 August 1862: Major-General Horatio Gouverneur Wright was appointed to command the Department of the Ohio, arriving on 23 August 1862.

19 August 1862: The Army of the Ohio transferred from the Department of the Mississippi to the Department of the Ohio.

23 August 1862: Major-General Horatio Gouverneur Wright arrived to command the Department of the Ohio.

24 August 1862: The District of Louisville was established in the Department of the Ohio, comprising the territory round Louisville, Kentucky.

25 August 1862: The Army of Kentucky was established in the Department of the Ohio.

30 August 1862: The Army of Kentucky was discontinued and incorporated into the Army of the Ohio.

6 September 1862: The state of Wisconsin transferred from the Department of the Ohio to the Department of the Northwest.

19 September 1862: Alton, Illinois, transferred from the Department of the Ohio to the Department of the Missouri.

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

19 September 1862: The Sub-District of the Kanawha was established in the Department of the Ohio.

24 September 1862: The Cheat Mountain District was established in the Department of the Ohio, comprising the vicinity of Cheat Mountain, Virginia.

28 September 1862: The District of Western Virginia was established in the Department of the Ohio, comprising western Virginia and the counties in Ohio adjacent to Virginia.

16 October 1862: Cairo, Illinois, transferred from the Department of the Ohio to the Department of the Tennessee.

24 October 1862: Tennessee east of the Tennessee River excluding Fort Henry and Fort Donelson and the territory around Cumberland Gap transferred from the Department the Ohio to the Department of the Cumberland.

24 October 1862: The portions of Alabama and Georgia under the control of the Army of the Ohio transferred to the Department of the Cumberland.

24 October 1862: The Army of the Ohio was discontinued, and its forces transferred to the Army of the Cumberland. 24 October 1862: The District of the Ohio was discontinued, and its territory incorporated into the Department of the Cumberland.

13 November 1862: The Cheat Mountain District in the Department of the Ohio was discontinued.

17 November 1862: The District of Central Kentucky was established in the Department of the Ohio.

17 November 1862: The District of Eastern Kentucky was established in the Department of the Ohio.

17 November 1862: The District of Louisville was discontinued, and its territory incorporated into the District of Western Kentucky.

17 November 1862: The District of Western Kentucky was established in the Department of the Ohio.

17 November 1862: The Army of Kentucky was established in the Department of the Ohio.

16 March 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.

16 March 1863: The Sub-District of the Kanawha was discontinued.

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

23 March 1863: The District of Indiana was established in the Department of the Ohio.

25 March 1863: Brigadier-General Ambrose Everett Burnside assumed command of the Department of the Ohio, succeeding Brigadier-General Horatio Gouverneur Wright.

6 April 1863: The District of Ohio was established in the Department of the Ohio.

7 April 1863: The District of Illinois was established in the Department of the Ohio.

11 April 1863: The Army of the Ohio was established in the Department of the Ohio.

11 April 1863: IX Corps Ohio transferred from the Department of the Ohio to the Army of the Ohio.

22 May 1863: The District of Kentucky was established in the Department of the Ohio.

3 June 1863: Columbiana, Jefferson and Belmont counties, Ohio, transferred from the District of Ohio to the Department of the Monongahela.

3 June 1863: Gallipolis, Ohio, transferred from the Department of the Ohio to the Middle Department.

5 June 1863: The District of Indiana was discontinued, and its territory transferred to the District of Indiana and Michigan.

5 June 1863: The District of Indiana and Michigan was established in the Department of the Ohio

9 June 1863: Columbiana, Jefferson and Belmont counties, Ohio, transferred from the District of Ohio in the Department of the Ohio to the Department of the Monongahela.

9 June 1863: Gallipolis, Ohio, transferred from the Department of the Ohio to the Middle Department.

24 June 1863: The Ohio counties south of Belmont and neighbouring western Virginia transferred from the Department of the Ohio to the Department of West Virginia.

4 July 1863: The District of Central Kentucky was discontinued.

11 September 1863: The District of Indiana and Michigan was discontinued, and its territory transferred to the District of Indiana.

11 September 1863: The District of Indiana was established in the Department of the Ohio.

16 October 1863: The Department of the Ohio was subordinated to the Military Division of the Mississippi.

16 October 1863: Major-General Ambrose Everett Burnside retained command of the Department of the Ohio.

6 November 1863:

16 November 1863: The territory in eastern Tennessee which was occupied by troops of the Army of the Ohio transferred from the Department of the Cumberland to the Department of the Ohio.

16 November 1863: The District of Illinois was discontinued.

16 November 1863: The District of Indiana was discontinued.

16 November 1863: The District of Ohio was discontinued.

21 November 1863: The District of the Clinch was established in the Department of the Ohio.

9 December 1863: Major-General John Gray Foster assumed command of the Department of the Ohio, succeeding Major-General Ambrose Everett Burnside.

16 December 1863: The District of Middle Tennessee was established in the Department of the Ohio.

12 January 1864: The states of Ohio, Michigan, Indiana, and Illinois transferred from the Department of the Ohio to the Northern Department.

26 January 1864: Major-General John McAllister Schofield was appointed to command the Department of the Ohio, arriving on 9 February 1864.

8 February 1864: Jeffersonville, Indiana, transferred from the Northern Department to the Department of the Ohio.

9 February 1864: Major-General John McAllister Schofield arrived to command the Department of the Ohio, succeeding Major-General John Gray Foster.

14 February 1864: The District of Middle Tennessee was discontinued.

4 April 1864: The District of the Clinch was discontinued.

10 April 1864: The District of East Tennessee was established in the Department of the Ohio.

10 April 1864: The District of Nashville was discontinued, and its territory transferred to the District of Tennessee in the Department of the Cumberland.

25 June 1864: Covington, Kentucky, and the territory surrounding within ten miles transferred from the Department of the Ohio to the Northern Department.

10 August 1864: The portion of Kentucky west of the Tennessee River transferred from the Department of the Tennessee to the Department of the Ohio.

8 November 1864: Major-General George Stoneman was appointed to temporary command of the Department of the Ohio, arriving on 17 November 1864, to succeed Major-General John McAllister Schofield.

17 November 1864: Major-General George Stoneman arrived to temporary command of the Department of the Ohio, succeeding Major-General John McAllister Schofield.

17 January 1865: The District of East Tennessee transferred from the Department of the Ohio to the Department of the Cumberland.

17 January 1865: The District of Kentucky transferred from the Department of the Ohio to the Department of the Cumberland.

17 January 1865: The Department of the Ohio was discontinued, and its territory incorporated into the Department of the Cumberland.

Department of the Ohio #3

27 June 1865-31 December 1865

Edward Otho Cresap Ord 27 June 1865-5 July 1865

Orlando Bolivar Willcox 5 July 1865-31 December 1865

27 June 1865: The Department of the Ohio was re-established in the Military Division of the Mississippi. It comprised Ohio, Michigan, Illinois except for Alton, and Indiana except for Jeffersonville and New Albany.

27 June 1865: The Department of Pennsylvania was discontinued, and its territory transferred to the Middle Department and the Department of the Ohio.

27 June 1865: The Military Division of the Mississippi was reorganised to consist of the Department of the Ohio, the Department of the Missouri, and the Department of Arkansas.

27 June 1865: Alton, Illinois, transferred from the Department of the Missouri to the Department of the Ohio.

27 June 1865: Major-General Edward Otho Cresap Ord was appointed to command the Department of the Ohio, arriving on 5 July 1865.

5 July 1865: Major-General Edward Otho Cresap Ord arrived to command the Department of the Ohio.

30 October 1865: The state of Wisconsin transferred from the Department of the Missouri to the Department of the Ohio.

26 December 1865: Major-General Orlando Bolivar Willcox assumed temporary command of the Department of the Ohio, succeeding Major-General Edward Otho Cresap Ord.

Department of Tennessee

27 June 1865-31 December 1865

George Stoneman 27 June 1865-31 December 1865

27 June 1865: The Department of Tennessee was established in the Military Division of the Tennessee. It comprised the state of Tennessee.

27 June 1865: The Military Division of the Tennessee was established. It comprised the Department of Tennessee, the Department of Kentucky, the Department of Alabama, and the Department of Georgia.

27 June 1865: Major-General George Stoneman was appointed to command the Department of Tennessee, arriving on 1 July 1865.

1 July 1865: Major-General George Stoneman arrived to command the Department of Tennessee.

Department of the Tennessee

16 October 1862-28 November 1864

Ulysses Simpson Grant 16 October 1862-16 October 1863, interim 16 October 1863-26 October 1863

William Tecumseh Sherman 16 October 1863-11 March 1864 interim 26 March 1864

Joseph Birdseye McPherson 11 March 1864-2 July 1864

John Alexander Logan temporary 2 July 1864-27 July 1864 interim 30 July 1864

Oliver Otis Howard 27 July 1864-28 November 1864

16 October 1862: The Department of the Tennessee was established, comprising the territory around Cairo, Illinois, Forts Henry and Donelson, northern Mississippi, and parts of Kentucky and Tennessee west of the Tennessee River.

16 October 1862: Cairo, Illinois, transferred from the Department of the Ohio to the Department of the Tennessee.

16 October 1862: The District of West Tennessee was discontinued, and its territory incorporated into the Department of the Tennessee.

16 October 1862: Major-General Ulysses Simpson Grant was appointed to command the Department of the Tennessee, arriving on 25 October 1862.

16 October 1862: The District of Corinth transferred from the District of West Tennessee to the Department of the Tennessee.

16 October 1862: The District of Jackson was established in the Department of the Tennessee.

16 October 1862: The Army of West Tennessee was discontinued, and incorporated into the Army of the Tennessee.

16 October 1862: The Army of the Tennessee was established in the Department of the Tennessee.

16 October 1862: The Army of the Mississippi transferred from the District of West Tennessee to the Army of the Tennessee.

24 October 1862: The Army of the Mississippi was discontinued, and incorporated into XIII Corps Tennessee.

25 October 1862: Major-General Ulysses Simpson Grant arrived to command the Department of the Tennessee.

26 October 1862: The District of Memphis was established in the Department of the Tennessee.

30 October 1862: The District of Columbus was established in the Department of the Tennessee.

4 January 1863: The “Army of the Mississippi” was established unofficially to operate autonomously in the Department of the Tennessee.

12 January 1863: The unofficial “Army of the Mississippi” was discontinued, and its forces transferred to the Army of the Tennessee.

15 January 1863: The District of West Tennessee was established in the Department of the Tennessee.

15 January 1863: The District of Columbus was discontinued, and its territory incorporated into the District of West Tennessee.

15 January 1863: The District of Corinth was discontinued, and its territory incorporated into the District of West Tennessee.

15 January 1863: The District of Memphis was discontinued, and its territory transferred to the District of West Tennessee.

19 January 1863: Portions of Arkansas transferred temporarily from the Department of the Missouri to the Department of the Tennessee.

14 February 1863: The District of Eastern Arkansas transferred from the Department of the Missouri to the Department of the Tennessee.

11 May 1863: The District of Northeast Louisiana was established in the Department of the Tennessee.

28 May 1863: The District of Jackson was discontinued.

5 June 1863: IX Corps Ohio transferred from the Army of the Ohio to the Department of the Tennessee.

25 August 1863: IX Corps Tennessee transferred from the Department of the Tennessee to the Army of the Ohio.

16 October 1863: The Department of the Tennessee was subordinated to the Military Division of the Mississippi.

16 October 1863: Major-General William Tecumseh Sherman was appointed to command the Department of the Tennessee, arriving on 26 October 1863.

16 October 1863: Major-General William Ulysses Simpson Grant retained interim command of the Department of the Tennessee.

26 October 1863: Major-General William Tecumseh Sherman arrived to command the Department of the Tennessee, succeeding Major-General Ulysses Simpson Grant.

24 November 1863: Fort Henry and Fort Donelson transferred from the Department of the Tennessee to the Department of the Cumberland.

6 January 1864: The District of Eastern Arkansas transferred from the Department of the Tennessee to the Department of Arkansas.

12 January 1864: Cairo, Illinois, transferred from the Department of the Tennessee to the Northern Department.

25 January 1864: Cairo, Illinois, transferred from the Northern Department to the District of Cairo in the Department of the Tennessee.

25 January 1864: The District of Cairo was established in the Department of the Tennessee, comprising the vicinity of Cairo, Illinois.

7 February 1864: The District of Northeast Louisiana was discontinued in the Department of the Tennessee.

11 March 1864: Major-General Joseph Birdseye McPherson was appointed to command the Department of the Tennessee, arriving on 26 March 1864, to succeed Major-General William Tecumseh Sherman.

26 March 1864: Major-General James Birdseye McPherson arrived to command the Department of the Tennessee, succeeding Major-General William Tecumseh Sherman.

20 April 1864: The District of Vicksburg was established in the Department of the Tennessee.

2 July 1864: Major-General John Alexander Logan assumed temporary command of the Department of the Tennessee, succeeding Major-General James Birdseye McPherson.

27 July 1864: Major-General Oliver Otis Howard was appointed to command the Department of the Tennessee, arriving on 30 July 1864, to succeed Major-General John Alexander Logan.

20 July 1864: Major-General Oliver Otis Howard arrived to command the Department of the Tennessee, succeeding Major-General John Alexander Logan.

10 August 1864: The portion of Kentucky west of the Tennessee River transferred from the Department of the Tennessee to the Department of the Ohio.

11 September 1864: The District of Western Kentucky was discontinued.

24 November 1864: The Department of the Tennessee was nominally discontinued, and its territory subordinated to the Military Division of the Mississippi. The Department was effectively discontinued from 28 November 1864 when its constituent territorial commands transferred to a new Department of the Mississippi.

24 November 1864: Cairo, Illinois, transferred from the Department of the Tennessee to the Northern Department.

24 November 1864: Fort Henry and Fort Donelson transferred from the Department of the Tennessee to the Department of the Cumberland.

24 November 1864: The Army of the Tennessee transferred from the Department of the Tennessee to the Military Division of the Mississippi.

28 November 1864: The District of Vicksburg transferred from the Department of the Tennessee to the Department of the Mississippi.

28 November 1864: The District of West Tennessee transferred from the Department of the Tennessee to the Department of the Mississippi.

28 November 1864: The Department of the Tennessee was formally discontinued.

Department of Florida #1

13 April 1861-15 March 1862

Harvey Brown 13 April 1861-9 January 1862

Lewis Golding Arnold 10 January 1862-15 March 1862

13 April 1861: The Department of Florida was established with headquarters at Fort Pickens, comprising the state of Florida transferred from the Department of the East.

13 April 1861: Major Harvey Brown was appointed to command the Department of Florida, arriving on 18 April 1861.

18 April 1861: Major Harvey Brown arrived to command the Department of Florida, with headquarters at Fort Pickens in Pensacola Bay.

10 January 1862: Major Lewis Golding Arnold assumed command of the Department of Florida, succeeding Colonel Harvey Brown.

11 January 1862: Key West and the coastline of Florida from Cape Canaveral to the Apalachicola River transferred from the Department of Florida to the Department of Key West.

15 March 1862: The Department of Florida was discontinued, and its territory incorporated into the Western District of the Department of the South.

Department of Florida #2

27 June 1865-31 December 1865

John Newton interim 27 June 1865-1 August 1865

John Gray Foster 1 August 1865-31 December 1865

27 June 1865: The Department of Florida was established in the Military Division of the Gulf. It included the state of Florida.

27 June 1865: Major-General John Gray Foster was appointed to command the Department of Florida, arriving on August 1 1865

27 June 1865: Brigadier-General John Newton retained interim command of the Department of Florida.

1 August 1865: Major-General John Gray Foster arrived to command the Department of Florida.

Department of the Gulf

23 February 1862-27 June 1865

Benjamin Franklin Butler 23 February 1862-7 November 1862 interim 16 December 1862

Nathaniel Prentiss Banks 8 November 1862-21 September 1864, interim 22 September 1864

Stephen Augustus Hurlbut 22 September 1864-17 March 1865 interim to 21 April 1865

Nathaniel Prentiss Banks 22 April 1865-interim to 2 June 1865

Edward Richard Sprigg Canby 3 June 1865-27 June 1865

23 February 1862: The Department of the Gulf was established, with responsibility for the territory and forces west of the Mississippi River and in eastern Louisiana.

23 February 1862: Major-General Benjamin Franklin Butler was appointed to command the Department of the Gulf, arriving on 20 March 1862.

23 February 1862: The Army of the Gulf was established in the Department of the Gulf.

20 March 1862: Major-General Benjamin Franklin Butler arrived to command the Department of the Gulf.

8 August 1862: The District of Pensacola was established in the Department of the Gulf, comprising Florida west of the Apalachicola River. The rest of Florida remained in the Department of the South.

8 November 1862: The Department of Texas was discontinued and the state of Texas was added to the Department of the Gulf.

8 November 1862: Major-General Nathaniel Prentiss Banks was appointed to command the Department of the Gulf, arriving on 17 December 1862.

9 November 1862: The District of La Fourche was established in the Department of the Gulf.

16 December 1862: The Defences of New Orleans was established in the Department of the Gulf.

17 December 1862: Major-General Nathaniel Prentiss Banks arrived to command the Department of the Gulf, succeeding Major-General Benjamin Franklin Butler.

16 March 1863: The District of Key West and Tortugas was established in the Department of the Gulf. The Tortugas and West Florida transferred from the Department of the South, and the remainder of Florida remained in the Department of the South.

9 July 1863: The District of Port Hudson was established in the Department of the Gulf.

8 October 1863: The District of Baton Rouge was established in the Department of the Gulf.

1 May 1864: The District of Carrollton was established in the Department of the Gulf.

7 May 1864: The Department of the Gulf transferred to the Military Division of West Mississippi.

7 May 1864: Major-General Nathaniel Prentiss Banks retained command of the Department of the Gulf.

17 May 1864: The District of West Florida transferred from the Department of the South to the Department of the Gulf.

22 May 1864: The District of Morganza was established in the Department of the Gulf.

6 August 1864: The District of Baton Rouge was discontinued, and re-designated as a Sub-District in the District of Baton Rouge and Port Hudson.

6 August 1864: The District of Port Hudson was discontinued, and re-designated as a Sub-District in the District of Baton Rouge and Port Hudson.

6 August 1864: The District of Baton Rouge and Port Hudson was established to comprise the territories of Baton Rouge, Plaquemine, Gaines Landing, Pass Manchac, De Sair, and Port Hudson, Louisiana.

12 September 1864: The District of West Florida was discontinued, and renamed as the Sub-District of West Florida.

12 September 1864: The District of West Florida and South Alabama was established in the Department of the Gulf, comprising the territories of Mobile Bay and Pensacola, Florida.

12 September 1864: The Sub-District of West Florida was established in the District of West Florida and South Alabama.

22 September 1864: Major-General Stephen Augustus Hurlbut was appointed to command the Department of the Gulf, arriving on 23 September 1864, to succeed Major-General Nathaniel Prentiss Banks.

23 September 1864: Major-General Stephen Augustus Hurlbut arrived to command the Department of the Gulf, succeeding Major-General Nathaniel Prentiss Banks.

9 February 1865: The Northern District of Louisiana was established in the Department of the Gulf.

9 February 1865: The Defences of New Orleans was discontinued.

10 February 1865: The District of Key West and Tortugas transferred from the Department of the Gulf and transferred directly to the Military Division of West Mississippi.

11 February 1865: The Southern District of Louisiana was established.

11 February 1865: The District of Carrollton transferred to the Southern District of Louisiana.

11 February 1865: The District of La Fourche transferred to the Southern District of Louisiana.

11 February 1865: The District of Morganza transferred to the Northern District of Louisiana.

13 February 1865: The Sub-District of Baton Rouge was discontinued, and its territory transferred to the District of Baton Rouge and Port Hudson.

13 February 1865: The Sub-District of Port Hudson was discontinued, and its territory transferred to the District of Baton Rouge and the District of Port Hudson.

13 February 1865: The District of Baton Rouge and Port Hudson was discontinued, and divided into the District of Baton Rouge and the District of Port Hudson.

13 February 1865: The District of Baton Rouge was established and transferred to the Northern District of Louisiana.

13 February 1865: The District of Port Hudson was established and transferred to the Northern District of Louisiana.

18 February 1865: The Army of the Gulf transferred to the Army of West Mississippi.

1 March 1865: The District of West Florida and South Alabama transferred from the Department of the Gulf to the direct control of the Military Division of West Mississippi.

1 March 1865: The Sub-District of West Florida transferred with the District of West Florida and South Alabama from the Department of the Gulf to the Military Division of West Mississippi.

17 March 1865: The District of West Florida and South Alabama was discontinued. Its territory transferred to the Department of the Gulf as the new District of West Florida and the District of South Alabama.

17 March 1865: The Sub-District of West Florida was discontinued, and its territory assigned to the District of West Florida.

17 March 1865: The District of South Alabama was established in the Department of the Gulf.

17 March 1865: The District of West Florida was established in the Department of the Gulf.

18 March 1865: Major-General Nathaniel Prentiss Banks was appointed to command the Department of the Gulf, arriving on 22 April 1865.

27 March 1865: The District of Bonnet Carré was established in the Department of the Gulf. It comprised the territory between Bayou Manchac and Kennerville, Louisiana, west of New Orleans.

22 April 1865: Major-General Nathaniel Prentiss Banks arrived to command the Department of the Gulf, succeeding Major-General Stephen Augustus Hurlbut.

17 May 1865: The Military Division of the Southwest was established to comprise parts of the Department of Arkansas and the Department of the Gulf. The states of Louisiana and Texas were detached from the Department of the Gulf and assigned to the Military Division of the Southwest.

17 May 1865: The Military Division of West Mississippi was officially discontinued to be replaced by the Military Division of the Southwest. It remained in interim existence until finally disbanded officially on 1 June 1865.

17 May 1865: The Military Division of West Mississippi retained interim responsibility for the Army of West Mississippi and the Army of the Gulf.

17 May 1865: The Department of the Gulf was separated from the authority of the discontinued Military Division of West Mississippi and became temporarily autonomous with responsibility for Mississippi, Alabama, and Florida.

17 May 1865: The District of Alabama was established in the Department of the Gulf.

17 May 1865: The District of Mississippi was established in the Department of Gulf, comprising the state of Mississippi transferred from the Department of the Mississippi.

17 May 1865: The District of South Alabama was discontinued, and its territory incorporated into the District of Alabama.

17 May 1865: Major-General Edward Richard Sprigg Canby was appointed to command the Department of the Gulf, arriving on 3 June 1865 to succeed Major-General Nathaniel Prentiss Banks.

17 May 1865: Major-General Nathaniel Prentiss Banks retained interim command of the Department of the Gulf, pending the arrival of Major-General Edward Richard Sprigg Canby.

29 May 1865: The District of East Louisiana was established in the Department of the Gulf.

3 June 1865: Major-General Edward Richard Sprigg Canby arrived to command the Department of the Gulf, succeeding Major-General Nathaniel Prentiss Banks.

3 June 1865: The Army of the Gulf transferred from the Army of West Mississippi to the Department of the Gulf.

3 June 1865: The District of Florida transferred from the Department of the South to the Department of the Gulf. It comprised the state of Florida.

3 June 1865: The District of West Florida was discontinued, and its territory incorporated in the District of Florida.

3 June 1865: The Sub-District of Mobile was established in the District of Alabama.

5 June 1865: The District of Vicksburg transferred from the Department of the Mississippi to the Department of the Gulf.

22 June 1865: The District of Vicksburg was discontinued.

24 June 1865: The District of Port Hudson was discontinued.

27 June 1865: The Army of the Gulf was discontinued.

27 June 1865: The District of Florida was discontinued, and its territory transferred to the Department of Florida.

27 June 1865: The District of Bonnet Carré was discontinued.

27 June 1865: The District of Carrollton was discontinued.

27 June 1865: The District of La Fourche was discontinued.

27 June 1865: The District of Morganza was discontinued.

27 June 1865: The Northern District of Louisiana was discontinued.

27 June 1865: The Southern District of Louisiana was discontinued.

27 June 1865: The District of Baton Rouge transferred from the Department of the Gulf to the Department of Louisiana.

27 June 1865: The District of East Louisiana was discontinued.

27 June 1865: The District of Mississippi was discontinued.

27 June 1865: The District of Alabama was discontinued.

27 June 1865: The Sub-District of Mobile was discontinued, and incorporated into the Department of Alabama.

27 June 1865: The Department of the Gulf was discontinued, and its territory incorporated into the Department of Louisiana, the Department of Mississippi, the Department of Alabama, the Department of Florida, and the Department of Texas.

Department of Key West, Florida

11 January 1862-15 March 1862

John Milton Brannan 11 January 1862-15 March 1862

11 January 1862: The Department of Key West was established, comprising Florida from Cape Canaveral along the coast to the Apalachicola River, and the Tortugas.

11 January 1862: Key West and the coastline of Florida from Cape Canaveral to the Apalachicola River transferred from the Department of Florida to the Department of Key West.

11 January 1862: Brigadier-General John Milton Brannan was appointed to command the Department of Key West, arriving on 21 February 1862.

21 February 1862: Brigadier-General John Milton Brannan arrived to command the Department of Key West.

15 March 1862: The Department of Key West was discontinued, and incorporated into the Department of the South, later becoming the Southern District if the Department of the South.

Department of Louisiana

27 June 1865-31 December 1865

Edward Richard Sprigg Canby 27 June 1865-31 December 1865

27 June 1865: The Department of Louisiana was established in the Military Division of the Gulf.

27 June 1865: Major-General Edward Richard Sprigg Canby was appointed to command the Department of Louisiana, arriving on July 17 1865.

27 June 1865: The District of Baton Rouge transferred from the Department of the Gulf to the Department of Louisiana.

27 June 1865: The Western District of Louisiana was established in the Department of Louisiana.

27 June 1865: The Eastern District of Louisiana was established in the Department of Louisiana.

17 July 1865: Major-General Edward Richard Sprigg Canby arrived to command the Department of Louisiana.

17 July 1865: The District of Baton Rouge was discontinued.

20 July 1865: The Western District of Louisiana was discontinued.

26 July 1865: The Eastern District of Louisiana was discontinued.

Department of Texas #1

1 January 1861-8 November 1862

David Emanuel Twiggs 1 January 1861-18 February 1861

Carlos Adolphus Waite temporary 19 February 1861-22 April 1861

Vacant 23 April 1861-8 November 1862

1 January 1861: The Department of Texas comprised the state of Texas. Headquarters were at San Antonio.

1 January 1861: The Department of Texas was commanded by Brigadier-General USA David Emanuel Twiggs

18 February 1861: Command of the Department of Texas became vacant following the defection of Brigadier-General David Emanuel Twiggs to the Confederacy.

19 February 1861: Colonel Carlos Adolphus Waite assumed temporary command of the Department of Texas, replacing Brigadier-General David Emanuel Twiggs.

23 April 1861: The command the Department of Texas became vacant when Colonel Carlos Adolphus Waite was captured by Confederate authorities.

8 November 1862: The Department of Texas was discontinued. The state of Texas was added to the Department of the Gulf.

Department of Texas #2

27 June 1865-31 December 1865

Horatio Gouverneur Wright 27 June 1865-31 December 1865

27 June 1865: The Department of Texas was re-established in the Military Division of the Gulf. It comprised the state of Texas.

27 June 1865: Major-General Horatio Gouverneur Wright was appointed to command the Department of Texas, arriving on 6 August 1865.

27 June 1865: The Central District of Texas was established in the Department of Texas.

27 June 1865: The Eastern District of Texas was established in the Department of Texas.

27 June 1865: The Western District of Texas was established in the Department of Texas.

20 July 1865: The Western District of Texas was discontinued.

20 July 1865: The Central District of Texas was discontinued.

20 July 1865: The Eastern District of Texas was discontinued.

6 August 1865: Major-General Horatio Gouverneur Wright arrived to command the Department of Texas.

Department of Georgia

27 June 1865-31 December 1865

James Blair Steedman 20 June 1865-20 December 1865

James Harrison Wilson 20 December 1865-31 December 1865

27 June 1865: The Department of Georgia was established in the Military Division of the Tennessee. It comprised the state of Georgia.

27 June 1865: Major-General James Blair Steedman was appointed to command the Department of Georgia, arriving on 29 June 1865.

29 June 1865: Major-General James Blair Steedman arrived to command the Department of Georgia.

20 December 1865: Major-General James Harrison Wilson assumed command of the Department of Georgia, succeeding Major-General James Blair Steedman.

Department of North Carolina #1

7 January 1862-15 July 1863

Ambrose Everett Burnside 7 January 1862-5 July 1862 interim to 9 July 1862

John Gray Foster 6 July 1862-28 March 1863

Innis Newton Palmer temporary 29 March 1863-15 April 1863

John Gray Foster 16 April 1863-15 July 1863

7 January 1862: The Department of North Carolina was established, comprising the parts of North Carolina occupied by Union forces, and territories detached from the Department of Virginia.

7 January 1862: Brigadier-General Ambrose Everett Burnside was appointed to command the Department of North Carolina, arriving on 13 January 1862.

13 January 1862: Brigadier-General Ambrose Everett Burnside arrived to command the Department of North Carolina.

6 July 1862: Brigadier-General John Gray Foster was appointed to command the Department of North Carolina, arriving on 10 July 1862, to succeed Major-General Ambrose Everett Burnside.

10 July 1862: Brigadier-General John Gray Foster arrived to command the Department of North Carolina, succeeding Major-General Ambrose Everett Burnside.

24 December 1862: XVIII Corps North Carolina was established in the Department of North Carolina, comprising forces from the expeditions to Roanoke Island and New Bern and the garrisons of New Bern, Plymouth, and Beaufort.

29 March 1863: Brigadier-General Innis Newton Palmer assumed temporary command of the Department of North Carolina, succeeding Major-General John Gray Foster.

16 April 1863: Brigadier-General John Gray Foster assumed command of the Department of North Carolina, succeeding Brigadier-General Innis Newton Palmer.

23 April 1863: The District of Albemarle was established in the Department of North Carolina, comprising the territories around Plymouth and Roanoke, North Carolina.

23 April 1863: The District of the Neuse was established in the Department of North Carolina, comprising the stations of the Atlantic & North Carolina Railroad outside New Bern, North Carolina.

23 April 1863: The District of the Pamlico was established in the Department of North Carolina, comprising Washington, North Carolina, Hatteras Inlet and the surrounding areas.

27 April 1863:The District of the Neuse was discontinued.

27 April 1863:The District of Beaufort North Carolina was established in the Department of North Carolina by renaming the District of the Neuse. It included the region south of a line from Evan’s Mill due east to the Neuse River, except for Portsmouth, North Carolina.

27 April 1863:The District of the Pamlico was redefined to include Craven County north of the Neuse River except for Fort Anderson; and the counties of Pitt, Beaufort and Hyde.

15 July 1863: The Department of North Carolina was discontinued, and its territory incorporated into the Department of Virginia and North Carolina.

Department of North Carolina #2

31 January 1865-31 December 1865

John Gray Foster interim 31 January 1865-9 February 1865

John McAllister Schofield 9 February 1865-31 March 1865

Jacob Dolson Cox 31 March 1865-17 June 1865

Thomas Howard Ruger temporary 17 June 1865-27 June 1865

Samuel Powhatan Carter temporary 27 June 1865-28 June 1865

Thomas Howard Ruger 28 June 1865-31 December 1865

31 January 1865: The Department of North Carolina was re-established in the Military Division of the Mississippi.

31 January 1865: Major-General John McAllister Schofield was appointed to command the Department of North Carolina, arriving on 9 February 1865.

31 January 1865: Major-General John Gray Foster assumed interim command of the Department of North Carolina.

31 January 1865: The District of North Carolina was established in the Department of North Carolina.

31 January 1865: The Sub-District of Beaufort North Carolina transferred from the Department of Virginia to the District of North Carolina.

31 January 1865: Terry’s Provisional Corps transferred from the Department of Virginia to the Department of North Carolina.

2 February 1865: XXIII Corps Ohio transferred from the Military Division of the Mississippi to the Department of North Carolina, and continued to be referred to unofficially as the “Army of the Ohio”.

9 February 1865: Major-General John McAllister Schofield arrived to command the Department of North Carolina, succeeding Major-General John Gray Foster.

25 February 1865: The District of Beaufort was established in the Department of North Carolina from the former Sub-District of Beaufort.

1 March 1865: The District of North Carolina was discontinued.

1 March 1865: The District of Wilmington was established in the Department of North Carolina.

23 March 1865: X Corps North Carolina was established in the Department of North Carolina, comprising forces previously in Terry’s Provisional Corps Virginia.

31 March 1865: Major-General Jacob Dolson Cox assumed command of the Department of North Carolina, succeeding Major-General John McAllister Schofield.

19 April 1865: 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.

17 June 1865: Brigadier-General Thomas Howard Ruger assumed temporary command of the Department of North Carolina, succeeding Major-General Jacob Dolson Cox.

27 June 1865: The Department of North Carolina transferred from the Military Division of the Mississippi to the Military Division of the Atlantic.

27 June 1865: Brigadier-General Samuel Powhatan Carter assumed temporary command of the Department of North Carolina, succeeding Brigadier-General Thomas Howard Ruger.

28 June 1865: Brigadier-General Thomas Howard Ruger assumed command of the Department of North Carolina, succeeding Brigadier-General Samuel Powhatan Carter.

6 July 1865: The District of Beaufort North Carolina was discontinued.

6 July 1865: The District of Greensboro was established in the Department of North Carolina.

6 July 1865: The District of New Bern was established in the Department of North Carolina.

6 July 1865: The District of Raleigh was established in the Department of North Carolina.

6 July 1865: The District of West North Carolina was established in the Department of North Carolina.

1 August 1865: X Corps North Carolina was discontinued.

1 August 1865: XXIII Corps North Carolina was discontinued.

20 September 1865: The District of Wilmington was discontinued.

1 October 1865: The District of West North Carolina was discontinued.

Department of the South

15 March 1862-27 June 1865

Thomas West Sherman interim 15 March 1862-30 March 1862

David Hunter 15 March 1862-4 September 1862

John Milton Brannan temporary 5 September 1862-16 September 1862

Ormsby McKnight Mitchel 17 September 1862-26 October 1862

John Milton Brannan temporary 27 October 1862-19 January 1863

David Hunter 20 January 1863-2 June 1863 interim to 11 June 1863

Quincy Adams Gillmore 3 June 1863-30 April 1864

John Porter Hatch 1 May 1864-4 May 1864 interim to 25 May 1864

John Gary Foster 5 May 1864-8 February 1865

Quincy Adams Gillmore 9 February 1865-27 June 1866

15 March 1862: The Department of the South was established with headquarters at Hilton Head, South Carolina, comprising the states of Florida, South Carolina, and Georgia.

15 March 1862: Major-General David Hunter was appointed to command the Department of the South, arriving on 31 March 1862.

15 March 1862: Brigadier-General Thomas West Sherman assumed interim command of the Department of the South. 15 March 1862: The Department of Florida was discontinued, and its territory incorporated into the Department of the South.

15 March 1862: The Department of Key West was discontinued, and incorporated into the Department of the South.

15 March 1862: The Western District was established in the Department of the South, comprising the territory in Florida west of a line due north of Cedar Keys.

31 March 1862: Major-General David Hunter arrived to command the Department of the South.

31 March 1862: The Northern District was established in the Department of the South, comprising the states of South Carolina, Georgia, and the parts of Florida north of the line connecting Cape Canaveral to Cedar Keys and east of a north-south line from Cedar Keys to the border of Georgia.

31 March 1862: The Southern District was established in the Department of the South, comprising Florida south of a line connecting Cape Canaveral and Cedar Keys.

21 June 1862: The Northern District of the Department of the South was discontinued.

21 June 1862: The Southern District of the Department of the South was discontinued.

21 June 1862: The Western District of the Department of the South was discontinued.

8 August 1862: The District of Pensacola was established and its territory transferred to the Department of the Gulf, comprising Florida west of the Apalachicola River. The rest of Florida remained in the Department of the South.

3 September 1862: X Corps South was established in the Department of the South.

5 September 1862: Brigadier-General John Milton Brannan assumed temporary command of the Department of the South, succeeding Major-General David Hunter.

17 September 1862: Major-General Ormsby McKnight Mitchel assumed command of the Department of the South, succeeding Brigadier-John Milton Brannan.

27 October 1862: Brigadier-General John Milton Brannan assumed temporary command of the Department of the South, succeeding Major-General Ormsby McKnight Mitchel.

20 January 1863: Major-General David Hunter assumed command of the Department of the South, succeeding Brigadier-General John Milton Brannan.

16 March 1863: The District of Key West and Tortugas was established in the Department of the Gulf. The Tortugas and West Florida transferred from the Department of the South and the remainder of Florida remained in the Department of the South.

3 June 1863: Brigadier-General Quincy Adams Gillmore was appointed to command the Department of the South, arriving on 12 June 1863, to succeed Major-General David Hunter.

12 June 1863: Brigadier-General Quincy Adams Gillmore arrived to command the Department of the South, succeeding Major-General David Hunter.

13 January 1864: The Northern District of the South was established in the Department of the South. It comprised the territory from Charleston Harbour to Saint Helena Sound, South Carolina.

15 January 1863: The District of Hilton Head was established in the Department of the South. It comprised Hilton Head, Seabrook and Saint Helena Islands in South Carolina, and Tybee Island and Fort Pulaski, Georgia.

1 February 1864: The District of Pensacola was discontinued in the Department of the Gulf and its territory transferred to the District of West Florida in the Department of the South.

15 January 1863: The District of West Florida was established in the Department of the South, comprising the vicinity of Pensacola, Florida.

7 February 1864: The District of Florida was established in the Department of the South, comprising the territories of Florida occupied by Federal troops.

25 April 1864: The District of Beaufort South Carolina was established in the Department of the South, comprising the vicinity of Beaufort, South Carolina.

28 April 1864: X Corps South transferred from the Department of the South to the Army of the James.

1 May 1864: Brigadier-General John Porter Hatch assumed temporary command of the Department of the South, succeeding Major-General Quincy Adams Gillmore.

5 May 1864: Major-General John Gray Foster was appointed to command the Department of the South, arriving on 26 May 1864.

17 May 1864: The District of West Florida transferred from the Department of the South to the Department of the Gulf.

26 May 1864: Major-General John Gray Foster arrived to command the Department of the South, succeeding Brigadier-General John Porter Hatch.

18 January 1865: The state of North Carolina transferred temporarily from the discontinued Department of Virginia and North Carolina to the Department of the South, pending the re-establishment of the Department of North Carolina on 31 January 1865.

18 January 1865: The District of Savannah was established in the Department of the South. It comprised the occupation forces in Savannah, Georgia.

31 January 1865: The state of North Carolina was removed from the temporary authority of the Department of the South.

9 February 1865: Major-General Quincy Adams Gillmore assumed command of the Department of the South, succeeding Major-General John Gray Foster.

16 April 1865: Major-General Edward Otho Cresap Ord was appointed to command the Department of the South but did not arrive to assume command. Major-General Quincy Adams Gillmore retained command of the Department of the South.

19 April 1865: Major-General Edward Otho Cresap Ord’s appointment to command the Department of the South was revoked before assuming command.

13 May 1865: The District of Beaufort South Carolina was discontinued, and its territory transferred to the District of Port Royal.

13 May 1865: The District of Hilton Head was discontinued, and its territory transferred to the District of Port Royal.

13 May 1865: The District of Port Royal was established in the Department of the South. It comprised the territories formerly in the District of Beaufort and the District of Hilton Head.

17 May 1865: The parts of Florida in the Department of the South transferred to the Department of the Gulf.

3 June 1865: The District of Florida transferred from the Department of the South to the Department of the Gulf. It comprised the state of Florida.

5 June 1865: The District of Northern Georgia was established in the Department of the South. It comprised the territory around Augusta and along the upper Savannah River.

5 June 1865: The District of Southern Georgia was established in the Department of the South. It comprised the state of Georgia south of the northern boundaries of Liberty, Tattnall, Montgomery, Laurens, Pulaski, Dooly, Sumter, Webster, and Stewart counties.

5 June 1865: The District of Savannah was extended to include the counties of Chatham, Bryan, Effingham, Bulloch,

23 June 1865: The District of Charleston was established in the Department of the South. It comprised Charleston, Colleton, Orangeburg, Lexington, Barnwell, and Richland districts counties of South Carolina. Emanuel, and Screven in Georgia.

23 June 1865: The District of Eastern South Carolina was established in the Department of the South. It consisted of Horry, Georgetown, Marion, Williamsburg, Marlboro, Darlington, Sumter, Kershaw, and Chesterfield districts counties.

23 June 1865: The District of Western South Carolina was established in the Department of the South. It consisted of Lancaster, Fairfield, Chester, York, Union, Newberry, Edgefield, Abbeville, Laurens, Spartanburg, Greenville, Anderson, and Pickens districts counties.

27 June 1865: The Northern District of the Department of the South was discontinued.

27 June 1865: The District of Charleston was discontinued.

27 June 1865: The District of Eastern South Carolina was discontinued.

27 June 1865: The District of Western South Carolina was discontinued.

27 June 1865: The District of Port Royal was discontinued.

27 June 1865: The District of Savannah was discontinued.

27 June 1865: The District of Southern Georgia was discontinued.

27 June 1865: The District of Northern Georgia was discontinued.

27 June 1865: The Department of the South was discontinued, and its territory divided between the Department of Georgia and the Department of South Carolina.

Department of South Carolina

27 June 1865-31 December 1865

Quincy Adams Gillmore 27 June 1865-10 September 1865

Charles Devens temporary 10 September 1865-16 October 1865

Quincy Adams Gillmore 16 October 1865-9 November 1865 interim 18 November 1865

Daniel Edgar Sickles 9 November 1865-31 December 1865

27 June 1865: The Department of South Carolina was established in the Military Division of the Atlantic.

27 June 1865: Major-General Quincy Adams Gillmore was appointed to command the Department of South Carolina, arriving on 18 July 1865.

18 July 1865: Major-General Quincy Adams Gillmore arrived to command the Department of South Carolina.

10 September 1865: Brigadier-General Charles Devens assumed temporary command of the Department of South Carolina, succeeding Major-General Quincy Adams Gillmore.

16 October 1865: Major-General Quincy Adams Gillmore assumed command of the Department of South Carolina, succeeding Brigadier-General Charles Devens.

9 November 1865: Major-General Daniel Edgar Sickles was appointed to command the Department of South Carolina, arriving on 18 November 1865.

18 November 1865: Major-General Daniel Edgar Sickles arrived to command the Department of South Carolina, succeeding Brigadier-General Charles Devens.

Middle Department

22 March 1862-31 December 1865

John Adams Dix 22 March 1862-1 June 1862 interim 9 June 1862

John Ellis Wool 1 June 1862-17 December 1862 interim 22 December 1862

Robert Cumming Schenck 17 December 1862-12 March 1863

William Walton Morris temporary 12 March 1863-20 March 1863

Robert Cumming Schenck 20 March 1863-10 August 1863

William Walton Morris temporary 10 August 1863-31 August 1863

Robert Cumming Schenck 31 August 1863-22 September 1863,

William Walton temporary 22 September 1863-28 September 1863

Erastus Barnard Tyler temporary 28 September 1863-10 October 1863

Robert Cumming Schenck 10 October 1863-21 November 1863 interim 5 December 1863

Henry Hayes Lockwood 21 November 1863-12 March 1864 interim 22 March 1864

Lewis Wallace 12 March 1864-1 February 1865

William Walton Morris temporary 1 February 1865-19 April 1865

Lewis Wallace 19 April 1865-27 June 1865 interim 27 June 1865-18 July 1865

Winfield Scott Hancock 27 June 1865-18 August 1865

Andrew Atkinson Humphreys temporary 18 August 1865-23 October 1865, 23 October 1865-13 November 1865

Winfield Scott Hancock 13 November 1865-21 December 1865

Emory Upton temporary 21 December 1865-29 December 1865

Winfield Scott Hancock 29 December 1865-31 December 1865

22 March 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. transferred from the Department of the Potomac.

22 March 1862: Major-General John Adams Dix assumed command of the Middle Department.

22 March 1862: The District of the Eastern Shore of Maryland was established in the Middle Department.

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

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

12 July 1862: VIII Corps Middle was organised in the Middle Department.

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

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

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

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

16 March 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.

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

9 June 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, transferred from the Middle Department and the Department of the Ohio to the Department of the Monongahela.

9 June 1863: Pennsylvania east of Johnstown and the Laurel Hill Mountains transferred from the Middle Department to the Department of the Susquehanna.

9 June 1863: Gallipolis, Ohio, transferred from the Department of the Ohio to the Middle Department.

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

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

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

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

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

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

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

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

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

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

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

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

7 August 1864: The Middle Department transferred to the Middle Military Division.

7 August 1864: Major-General Lewis Wallace retained command of the Middle Department.

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

24 March 1865: The District of Delaware and the Eastern Shore was established in the Middle Department.

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

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

1 April 1865: The District of Annapolis was established in the Middle Department.

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

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

27 June 1865: The Department of Pennsylvania was discontinued, and its territory incorporated into the Middle Department and the Department of the Ohio.

27 June 1865: The Department of the Potomac was discontinued, and its territory incorporated into the Middle Department.

27 June 1865: The Middle Department transferred from the Middle Military Division to the Military Division of the Atlantic.

27 June 1865: Major-General Winfield Scott Hancock was appointed to command the Middle Department, arriving on 18 July 1865, to succeed Major-General Lewis Wallace.

27 June 1865: Major-General Lewis Wallace retained interim command of the Middle Department.

27 June 1865: The District of Columbia, Montgomery County, that part of Anne Arundel County south of the Annapolis & Elkridge Railroad including Annapolis and Prince George’s, Calvert, Charles and St Mary’s counties in Maryland, and Alexandria and Fairfax counties in Virginia were transferred from the Department of the Potomac and the Department of Washington to the Middle Department.

27 June 1865: The Department of West Virginia was discontinued, and its territory was incorporated partly into the Middle Department and partly into the Department of the Ohio.

18 July 1865: Major-General Winfield Scott Hancock arrived to command the Middle Department, succeeding Major-General Lewis Wallace.

19 July 1865: The District of Annapolis was discontinued.

27 July 1865: Fort Delaware transferred from the War Department to the Middle Department.

1 August 1865: The District of Delaware and the Eastern Shore was discontinued.

18 August 1865: Major-General Andrew Atkinson Humphreys assumed temporary command of the Middle Department, succeeding Major-General Winfield Scott Hancock.

23 October 1865: Major-General Andrew Atkinson Humphreys assumed full command of the Middle Department, succeeding Major-General Winfield Scott Hancock.

13 November 1865: Major-General Winfield Scott Hancock assumed command of the Middle Department, succeeding Major-General Andrew Atkinson Humphreys.

21 December 1865: Brigadier-General Emory Upton assumed temporary command of the Middle Department, succeeding Major-General Winfield Scott Hancock.

29 December 1865: Major-General Winfield Scott Hancock assumed command of the Middle Department, succeeding Brigadier-General Emory Upton.

Mountain Department

11 March 1862-26 June 1862

William Starke Rosecrans interim 11 March 1862-29 March 1862

John Charles Frémont 11 March 1862-26 June 1862

11 March 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.

11 March 1862: Major-General John Charles Frémont was appointed to command the Mountain Department, arriving on 29 March 1862.

11 March 1862: Brigadier-General William Starke Rosecrans retained interim command of the Mountain Department pending the arrival of Major-General John Charles Frémont.

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

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

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

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

11 March 1862: The District of Cumberland was established in the Mountain Department.

11 March 1862: The District of the Gap was established in the Mountain Department.

11 March 1862: The District of the Valley of the Big Sandy River was established in the Mountain Department.

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

7 April 1862: The District of Cumberland was discontinued.

8 June 1862: The territories of Eastern Kentucky and eastern Tennessee transferred from the Mountain Department to the Department of the Mississippi.

8 June 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 transferred from the Department of the Shenandoah to the Mountain Department.

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

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

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

26 June 1862: The Cheat Mountain District was discontinued.

26 June 1862: The Railroad District was discontinued.

26 June 1862: I Corps Virginia was established to include the field forces formerly in the Mountain Department.

26 June 1862: The Mountain Department was discontinued.

Department of Northeastern Virginia

27 May 1861-17 August 1861

Irvin McDowell 27 May 1861-17 August 1861

27 May 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.

27 May 1861: Brigadier-General Irvin McDowell was appointed to command the Department of Northeastern Virginia, arriving on 28 May 1861.

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

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

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

25 July 1861: Brigadier-General Irvin McDowell retained command of the Department of Northeastern Virginia.

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

Department of the Potomac

17 August 1861-27 June 1865

Irvin McDowell interim 17 August 1861-19 August 1861

George Brinton McClellan 17 August 1861-4 November 1862 interim 6 November 1862

Ambrose Everett Burnside 5 November 1862-24 January 1863 interim 25 January 1863

Joseph Hooker 25 January 1863-26 June 1863 interim 27 June 1863

George Gordon Meade 27 June 1863-19 December 1863

John Grubb Parke temporary 20 December 1864-10 January 1865

George Gordon Meade 11 January 1865-27 June 1865

17 August 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.

17 August 1861: The Department of Pennsylvania was discontinued, and incorporated into the Department of the Potomac. Pennsylvania remained under independent state command.

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

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

17 August 1861: Major-General George Brinton McClellan was appointed to command the Department of the Potomac, arriving on 20 August 1861.

17 August 1861: Major-General Irvin McDowell retained interim command of the Department of the Potomac.

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

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

20 October 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.

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

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

1 February 1862: The state of Pennsylvania was incorporated into the Department of the Potomac.

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

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

12 March 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.

17 March 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.

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

4 April 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.

4 April 1862: 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.

4 April 1862: 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.

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

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

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

12 September 1862: The Army of Virginia was discontinued, and its forces incorporated into the Army of the Potomac.

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

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

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

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

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

2 February 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.

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

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

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

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

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

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

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

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

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

19 April 1865: The Department of the Potomac transferred to the Military Division of the James.

19 April 1865: Major-General George Gordon Meade retained command of the Department of the Potomac.

6 May 1865: Sheridan’s Cavalry Command Potomac was discontinued.

27 June 1865: The Army of the Potomac transferred from the Department of the Potomac to the Military Division of the Atlantic.

27 June 1865: The Department of the Potomac was discontinued, and its territory incorporated into the Middle Department.

Department of the Rappahannock Virginia

4 April 1862-26 June 1862

Irvin McDowell 4 April 1862-26 June 1862

4 April 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.

4 April 1862: I Corps Potomac was discontinued, and its forces were incorporated into the Department of the Rappahannock.

4 April 1862: Major-General Irvin McDowell assumed command of the Department of the Rappahannock.

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

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

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

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

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

Department of the Shenandoah #1

19 July 1861-17 August 1861

Nathaniel Prentiss Banks 19 July 1861-17 August 1861

19 July 1861: The Department of the Shenandoah was established, comprising the Shenandoah Valley of Virginia, taken from the Department of the East.

19 July 1861: Major-General Nathaniel Prentiss Banks was appointed to command the Department of the Shenandoah, arriving on 25 July 1861.

19 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.

25 July 1861: Washington and Allegheny counties of Maryland transferred from the Department of Pennsylvania to the Department of the Shenandoah.

25 July 1861: Major-General Nathaniel Prentiss Banks arrived to command the Department of the Shenandoah.

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

Department of the Shenandoah #2

4 April 1862-26 June 1862

Nathaniel Prentiss Banks 4 April 1862-26 June 1862

4 April 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. 4 April 1862: 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.

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

4 April 1862: Major-General Nathaniel Prentiss Banks was appointed to command the Department of the Shenandoah, arriving on 12 April 1862.

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

8 June 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, transferred from the Department of the Shenandoah to the Mountain Department.

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

26 June 1862: The Department of the Shenandoah was discontinued, and its territory incorporated into the Department of the Potomac.

Department of Virginia #1

22 May 1861-15 July 1863

Benjamin Franklin Butler 22 May 1861-8 August 1861 interim 16 August 1861

John Ellis Wool 9 August 1861-1 June 1862 interim 16 June 1862

John Adams Dix 2 June 1862-5 April 1863

Erasmus Darwin Keyes 6 April 1863-15 July 1863

22 May 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.

22 May 1861: Major-General Benjamin Franklin Butler assumed command of the Department of Virginia.

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

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

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

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

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

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

22 July 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.

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

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

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

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

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

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

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

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

15 July 1863: The Department of Virginia was discontinued, and its territory incorporated into the Department of Virginia and North Carolina.

Department of Virginia #2

18 January 1865-31 December 1865

Edward Otho Cresap Ord 18 January 1865-13 May 1865

Alfred Howe Terry temporary 13 May 1865-14 June 1865, 14 June 1865-31 December 1865

18 January 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.

18 January 1865: Major-General Edward Otho Cresap Ord was appointed to command the Department of Virginia, arriving on 22 January 1865.

18 January 1865: The District of Eastern Virginia transferred from the Department of Virginia and North Carolina to the Department of Virginia.

18 January 1865: The Sub-District of Beaufort North Carolina transferred from the Department of Virginia and North Carolina to the Department of Virginia.

18 January 1865: The state of North Carolina transferred temporarily from the discontinued Department of Virginia and North Carolina to the Department of the South, pending the re-establishment of the Department of North Carolina on 31 January 1865.

18 January 1865: The Sub-District of New Bern transferred from the Department of Virginia and North Carolina to the Department of Virginia.

18 January 1865: The Army of the James transferred interim from the Department of Virginia and North Carolina to the Department of Virginia.

18 January 1865: Terry’s Provisional Corps transferred interim from the Department of Virginia and North Carolina to the Department of Virginia.

22 January 1865: Major-General Edward Otho Cresap Ord arrived to command the Department of Virginia.

31 January 1865: The Sub-District of Beaufort North Carolina transferred from the Department of Virginia to the District of North Carolina.

31 January 1865: Terry’s Provisional Corps transferred from the Department of Virginia to the Department of North Carolina.

31 January 1865: The District of Virginia was established in the Department of Virginia.

31 January 1865: The Sub-District of New Bern was discontinued, and its territory transferred to the District of North Carolina.

31 January 1865: The Army of the James transferred officially to the Department of Virginia.

25 March 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.

13 April 1865: The District of the Peninsula was established in the Department of Virginia. It comprised the territory between the York and James Rivers.

16 April 1865: Major-General Henry Wager Halleck was appointed to command the Department of Virginia but did not arrive to take command.

16 April 1865: Major-General Edward Otho Cresap Ord retained command of the Department of Virginia.

19 April 1865: The Department of Virginia transferred to the Military Division of the James.

27 April 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.

13 May 1865: Major-General Alfred Howe Terry assumed interim temporary command of the Department of Virginia, succeeding Major-General Edward Otho Cresap Ord.

21 May 1865: The District of Fort Monroe was established in the Department of Virginia.

22 May 1865: The District of the Nottoway was established in the Department of Virginia.

25 May 1865: The District of Henrico was established in the Department of Virginia.

25 May 1865: The Sub-District of The Blackwater was established in the District of the Nottoway in the Department of Virginia.

25 May 1865: The Sub-District of Roanoke was established in the District of the Nottoway.

25 May 1865: The Sub-District of the Appomattox was established in the District of the Nottoway in the Department of Virginia.

25 May 1865: The Sub-District of the Peninsula transferred from the District of Eastern Virginia to the District of Fort Monroe.

25 May 1865: The Sub-District of the Rappahannock was established in the Department of Virginia.

25 May 1865: The Sub-District of the South Anna was established in the Department of Virginia.

14 June 1865: Brigadier-General Alfred Howe Terry assumed full command of the Department of Virginia.

27 June 1865: The Department of Virginia transferred from the Military Division of the James to the Military Division of the Atlantic. It was reorganised to comprise Virginia except for Alexandria, Fairfax and Loudoun counties and the Shenandoah Valley south of and including Rockingham County, transferred from the Department of the Potomac.

27 June 1865: Major-General Alfred Howe Terry retained command of the Department of Virginia.

10 July 1865: The District of Northeastern Virginia was established in the Department of Virginia.

13 July 1865: The District of Lynchburg was discontinued.

13 July 1865: Manchester County, Virginia, was added to the District of Henrico.

13 July 1865: The District of Southwestern Virginia was established in the Department of Virginia.

16 July 1865: The Sub-District of Roanoke was discontinued.

16 July 1865: The Sub-District of the Rappahannock was discontinued, and its territory incorporated into the District of Northeastern Virginia.

1 August 1865: The District of the Nottoway was discontinued.

1 August 1865: The Sub-District of The Blackwater transferred from the District of the Nottoway to the Department of Virginia.

1 August 1865: The Sub-District of the Appomattox transferred from the District of the Nottoway to the Department of Virginia.

1 August 1865: The Army of the James was discontinued.

11 August 1865: The Sub-District of the Appomattox was discontinued.

24 August 1865: The District of Eastern Virginia was discontinued.

29 August 1865: The Sub-District of the Peninsula was discontinued.

19 September 1865: The Sub-District of The Blackwater was discontinued.

Department of Virginia and North Carolina

15 July 1863-18 January 1865

John Gray Foster 15 July 1863-28 August 1863

Benjamin Franklin Butler 28 August 1863-26 July 1864

Edward Otho Cresap Ord temporary 27 July 1864-26 August 1864, 27 August 1864-4 September 1864

David Bell Birney temporary 5 September 1864-September 1864

Benjamin Franklin Butler 7 September 1864-13 December 1864

Edward Otho Cresap Ord temporary 14 December 1864-23 December 1864

Benjamin Franklin Butler 24 December 1864-18 January 1865

15 July 1863: The Department of Virginia and North Carolina was established with headquarters at Fortress Monroe, comprising the territories formerly under the authority of Department of North Carolina and the Department of Virginia.

15 July 1863: The Department of North Carolina was discontinued, and its territory incorporated into the Department of Virginia and North Carolina.

15 July 1863: The Department of Virginia was discontinued, and its territory transferred to the Department of Virginia and North Carolina.

15 July 1863: The District of Albemarle transferred from the Department of North Carolina to the Department of Virginia and North Carolina.

15 July 1863: The District of Beaufort North Carolina transferred from the Department of North Carolina to the Department of Virginia and North Carolina.

15 July 1863: The District of the Pamlico transferred from the Department of North Carolina to the Department of Virginia and North Carolina.

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

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

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

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

15 July 1863: Major-General John Gray Foster appointed to command the Department of Virginia and North Carolina, arriving on 18 July 1863.

18 July 1863: Major-General John Gray Foster arrived to command the Department of Virginia and North Carolina.

18 July 1863: The District of Yorktown was established in the Department of Virginia and North Carolina, comprising the vicinity of Yorktown, Virginia.

21 July 1863: The Defences of New Bern was established in the Department of Virginia and North Carolina, comprising the vicinity of New Bern, North Carolina.

14 August 1863: The District of North Carolina was established in the Department of Virginia and North Carolina, comprising the former District of Albemarle, District of the Pamlico, District of Beaufort and the Defences of New Bern, each of which became a Sub-District of the District of North Carolina.

14 August 1863: The Sub-District of the Pamlico was established in the District of North Carolina.

14 August 1863: The Defences of New Bern transferred from the Department of Virginia and North Carolina to the District of North Carolina.

14 August 1863: The District of Albemarle was renamed as the Sub-District of Albemarle in the District of North Carolina.

14 August 1863: The District of Beaufort North Carolina was renamed as the Sub-District of Beaufort North Carolina in the District of North Carolina.

16 August 1863: The Army of North Carolina was established in the Department of Virginia and North Carolina.

21 August 1863: The District of Virginia was established in the Department of Virginia and North Carolina, comprising the territory around Fort Monroe, Camp Hamilton, Newport News, Yorktown, Suffolk, Portsmouth, and Norfolk.

21 August 1863: The District of Yorktown was renamed as the Sub-District of Yorktown in the District of Virginia.

21 August 1863: The Sub-District of Yorktown was established in the District of Virginia, comprising the renamed District of Yorktown.

28 August 1863: Major-General Benjamin Franklin Butler assumed command of the Department of Virginia and North Carolina, succeeding Major-General John Gray Foster.

23 September 1863: The Sub-District of Yorktown was discontinued, and renamed as the District of Yorktown in the Department of Virginia and North Carolina.

23 September 1863: The District of Yorktown was established in the Department of Virginia and North Carolina, comprising the territory of the former Sub-District of Yorktown from the District of Virginia.

11 December 1863: The District of Currituck was established in the Department of Virginia and North Carolina, comprising Pungo, Currituck Court House, Coinjack, and Northwest Landing, on the border of Virginia and North Carolina.

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

25 April 1864: The Army of North Carolina was discontinued, and its field forces transferred to the Department of Virginia and North Carolina.

28 April 1864: The Army of the James was established in the Department of Virginia and North Carolina.

17 May 1864: The District of Yorktown was discontinued.

27 May 1864: The District of Eastern Virginia was established in the Department of Virginia and North Carolina.

21 June 1864: St Mary’s county, Maryland, transferred from the Department of Virginia and North Carolina to the Department of Washington.

7 July 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.

27 July 1864: Major-General Edward Otho Cresap Ord assumed temporary command of the Department of Virginia and North Carolina, succeeding Major-General Benjamin Franklin Butler.

27 August 1864: Major-General Edward Otho Cresap Ord assumed full command of the Department of Virginia and North Carolina.

5 September 1864: Major-General David Bell Birney assumed temporary command of the Department of Virginia and North Carolina, succeeding Major-General Edward Otho Cresap Ord.

7 September 1864: Major-General Benjamin Franklin Butler assumed command of the Department of Virginia and North Carolina, succeeding Major-General David Bell Birney.

21 October 1864: The District of North Carolina was discontinued.

21 October 1864: The Sub-District of New Bern transferred from the District of North Carolina to the Department of Virginia and North Carolina.

21 October 1864: The Sub-District of Beaufort North Carolina transferred from the District of North Carolina to the Department of Virginia and North Carolina.

14 December 1864: Major-General Edward Otho Cresap Ord assumed temporary command of the Department of Virginia and North Carolina, succeeding Major-General Benjamin Franklin Butler.

24 December 1864: Major-General Benjamin Franklin Butler assumed command of the Department of Virginia and North Carolina, succeeding Major-General Edward Otho Cresap Ord.

6 January 1865: Terry’s Provisional Corps was established in the Department of Virginia and North Carolina, comprising X Corps Virginia and North Carolina.

18 January 1865: The District of Currituck was discontinued.

18 January 1865: The District of Eastern Virginia transferred from the Department of Virginia and North Carolina to the Department of Virginia.

18 January 1865: The Sub-District of Beaufort North Carolina transferred from the Department of Virginia and North Carolina to the Department of Virginia.

18 January 1865: The state of North Carolina transferred temporarily from the discontinued Department of Virginia and North Carolina to the Department of the South, pending the re-establishment of the Department of North Carolina on 31 January 1865.

18 January 1865: The Sub-District of New Bern transferred from the Department of Virginia and North Carolina to the Department of Virginia.

18 January 1865: The Department of Virginia and North Carolina was discontinued, and 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 transferred to the Department of Virginia.

Department of West Virginia

24 June 1863-27 June 1865

Benjamin Franklin Kelley 24 June 1863-29 February 1864 interim 10 March 1864

Franz Sigel 29 February 1864-19 May 1864 interim 24 May 1864

David Hunter 19 May 1864-25 July 1864 interim 7 August 1864-8 August 1864

Julius Stahel interim 8 August 1864-9 August 1864

George Crook 25 July 1864-7 August 1864, temporary 7 August 1864-1 September 1864, 1 September 1864-21 February 1865

John Dunlap Stevenson temporary 21 February 1865-26 February 1865 interim 27 February 1865

Samuel Sprigg Carroll interim 27 February 1865-28 February 1865

Winfield Scott Hancock 26 February 1865-28 February 1865 interim 1 March 1865

Samuel Sprigg Carroll temporary 28 February 1865-7 March 1865

Winfield Scott Hancock 7 March 1865-19 March 1865

George Crook temporary 19 March 1865-22 March 1865

Winfield Scott Hancock 22 March 1865-22 April 1865 interim 24 April 1865

William Hemsley Emory temporary 24 April 1865-27 June 1865

24 June 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.

24 June 1863: The Ohio counties south of Belmont and neighbouring western Virginia transferred from the Department of the Ohio to the Department of West Virginia.

24 June 1863: Brigadier-General Benjamin Franklin Kelley was appointed to command the Department of West Virginia, arriving on 28 June 1863.

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

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

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

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

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

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

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

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

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

21 May 1864: Major-General David Hunter arrived to command the Department of West Virginia, succeeding Major-General Franz Sigel.

21 May 1864: The Army of the Shenandoah was established in the Department of West Virginia.

20 May 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.

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

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

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

7 August 1864: Major-General David Hunter retained interim command of the Department of West Virginia.

8 August 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.

8 August 1864: The Army of the Kanawha was discontinued, and its forces transferred to the Army of West Virginia. 8 August 1864: The Army of West Virginia was established in the Department of West Virginia.

9 August 1864: Brigadier-General George Crook arrived to temporary command of the Department of West Virginia, succeeding Major-General Julius Stahel.

30 August 1864: Brigadier-General George Crook assumed full command of the Department of West Virginia, arriving on 1 September 1864.

1 September 1864: Brigadier-General George Crook arrived to full command of the Department of West Virginia.

19 December 1864: The Army of West Virginia was discontinued.

21 February 1865: Brigadier-General John Dunlap Stevenson assumed temporary command of the Department of West Virginia, succeeding Major-General George Crook.

25 February 1865: The District of Harper’s Ferry was discontinued.

26 February 1865: Major-General Winfield Scott Hancock was appointed to command the Department of West Virginia, arriving on 28 February 1865, to succeed Brigadier-General John Dunlap Stevenson.

27 February 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.

28 February 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.

28 February 1865: Brigadier-General Samuel Sprigg Carroll assumed temporary command of the Department of West Virginia, arriving on 1 March 1865, after a period of interim command.

1 March 1865: Brigadier-General Samuel Sprigg Carroll arrived to temporary command the Department of West Virginia, succeeding Major-General Winfield Scott Hancock.

7 March 1865: Major-General Winfield Scott Hancock assumed command of the Department of West Virginia, succeeding Brigadier-General Samuel Sprigg Carroll.

19 March 1865: Major-General George Crook assumed temporary command of the Department of West Virginia, succeeding Major-General Winfield Scott Hancock.

22 March 1865: Major-General Winfield Scott Hancock assumed command of the Department of West Virginia, succeeding Major-General George Crook.

22 April 1865: Brigadier-General William Hemsley Emory was appointed to temporary command of the Department of West Virginia, arriving on 24 April 1865, to succeed Major-General William Scott Hancock.

24 April 1865: Brigadier-General William Hemsley Emory arrived to temporary command of the Department of West Virginia, succeeding Major-General Winfield Scott Hancock.

27 June 1865: The Department of West Virginia was discontinued, and its territory was incorporated into the Middle Department and the Department of the Ohio.

Department of Western Virginia

19 September 1861-11 March 1862

William Starke Rosecrans 19 September 1861-11 March 1862

19 September 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 supplemented on 9 November 1861 from the Department of the Potomac.

19 September 1861: Brigadier-General William Starke Rosecrans was appointed to command the Department of Western Virginia, arriving on 11 October 1861.

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

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

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

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

20 December 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.

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

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

Department of Annapolis, Maryland

27 April 1861-19 July 1861

Benjamin Franklin Butler 27 April 1861-15 May 1861

George Cadwalader 27 April 1861-15 May 1861

John Adams Dix 16 May 1861-31 May 1861 interim 10 June 1861

Nathaniel Prentiss Banks 1 June 1861-19 July 1861

27 April 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.

27 April 1861: Massachusetts State Brigadier-General Benjamin Franklin Butler was appointed to command the Department of Annapolis but did not arrive to take command.

15 May 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.

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

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

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

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

Department of the East #1

1 January 1861-26 October 1861

John Ellis Wool 1 January 1861-26 October 1861

1 January 1861: The Department of the East included all of the United States east of the Mississippi River. Headquarters were at New York.

1 January 1861: The Department of the East was commanded by Brigadier-General USA John Ellis Wool.

9 April 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.

13 April 1861: The Department of Florida was established with headquarters at Fort Pickens, comprising the state of Florida taken from the Department of the East.

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

27 April 1861: The Department of Washington was extended to include the District of Columbia, and Maryland as far as Fort Washington and Bladensburg, Maryland, taken from the Department of the East.

3 May 1861: The Department of the Ohio was established, comprising Illinois, Ohio and Indiana taken from the Department of the East.

8 May 1861:The parts of Pennsylvania and Virginia north of the Kanawha River, north and west of the Greenbrier River and thence on a line northwest to the southwest boundary of Maryland transferred from the Department of the East to the Department of the Ohio.

9 May 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.

22 May 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.

27 May 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.

28 May 1861: The Department of Kentucky was established, comprising that territory of the state within 100 miles of the Ohio River, detached from the Department of the East.

19 July 1861: The Department of the Shenandoah was established, comprising the Shenandoah Valley of Virginia, taken from the Department of the East. 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.

17 August 1861: Command of the Department of the East became vacant until it was formally discontinued on 26 October 1861.

19 September 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.

1 October 1861: The Department of New England was established, comprising the states of Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and Connecticut detached from the Department of the East.

26 October 1861: The Department of the East was discontinued.

Department of the East #2

3 January 1863-31 December 1865

Vacant 3 January 1863-11 January 1863

John Ellis Wool 12 January 1863-17 July 1863

John Adams Dix 18 July 1863-9 April 1865

John James Peck temporary 10 April 1865-18 April 1865

John Adams Dix 19 April 1865-15 July 1865

Joseph Hooker 15 July 1865-31 December 1865

3 January 1863: The Department of the East was re-established comprising the states of Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and Connecticut transferred from local control, and New York taken from the discontinued Department of New York.

3 January 1863: Major-General John Ellis Wool was appointed to command Department of the East, arriving on 12 January 1863.

12 January 1863: Major-General John Ellis Wool arrived to command the Department of the East.

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

18 July 1863: Major-General John Adams Dix assumed command of the Department of the East, succeeding Major-General John Ellis Wool.

14 September 1864: The District of Northern New York was established in the Department of the East, comprising Albany, Sacket’s Harbor, Ogdensburg and Champlain, New York.

10 April 1865: Major-General John James Peck assumed temporary command of the Department of the East, succeeding Major-General John Adams Dix.

19 April 1865: Major-General John Adams Dix assumed command of the Department of the East, succeeding Major-General John James Peck.

27 June 1865: The District of Northern New York was discontinued.

27 June 1865: The Department of the East transferred to the Military Division of the Atlantic.

27 June 1865: Major-General John Adams Dix retained command of the Department of the East.

15 July 1865: Major-General Joseph Hooker assumed command of the Department of the East, succeeding Major-General John Adams Dix.

14 September 1865: The District of Western New York was re-established in the Department of the East. It comprised Elmira, Rochester, Fort Ontario, Fort Niagara and Fort Porter counties in New York.

Department of Maryland

19 July 1861-25 July 1861

John Adams Dix 19 July 1861-25 July 1861

19 July 1861: 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.

19 July 1861: Major-General John Adams Dix was appointed to command the Department of Maryland, arriving on 23 July 1861.

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

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

Department of the Monongahela

9 June 1863-6 April 1864

Thomas Algeo Rowley 27 June 1864-7 August 1864

William Thomas Harbaugh Brooks 9 June 1863-6 April 1864

9 June 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 transferred from the Middle Department and the Department of the Ohio.

9 June 1863: Columbiana, Jefferson and Belmont counties, Ohio, transferred from the District of Ohio in the Department of the Ohio to the Department of the Monongahela.

9 June 1863: Major-General William Thomas Harbaugh Brooks was appointed to command the Department of the Monongahela, arriving on 11 June 1863.

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

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

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

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

Department of New England

1 October 1861-20 February 1862

Benjamin Franklin Butler 1 October 1861-20 February 1862

1 October 1861: The Department of New England was established, comprising the states of Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and Connecticut, detached from the Department of the East. Headquarters was at Boston, Massachusetts.

1 October 1861: Major-General Benjamin Franklin Butler was appointed to command the Department of New England, arriving on 6 October 1861.

6 October 1861: Major-General Benjamin Franklin Butler arrived to command the Department of New England.

20 February 1862: The Department of New England was discontinued, and the six states of Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and Connecticut reverted to local control.

Department of New York

26 October 1861-3 January 1863

Edward Denison Morgan 26 October 1861-31 December 1862

Vacant 1 January 1863-3 January 1863

26 October 1861: The Department of New York was established, with responsibility for the remaining territory of the discontinued Department of the East, with headquarters at Albany.

26 October 1861: Major-General Edwin Denison Morgan, Governor of New York, assumed command of the Department of New York.

9 November 1861: The state of Michigan transferred from the former Department from the East to the Department of the Ohio.

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

1 February 1862: The state of Pennsylvania was incorporated into the Department of the Potomac.

1 January 1863: Command of the Department of New York became vacant.

3 January 1863: The Department of New York was discontinued, and the state of New York transferred to the Department of the East.

Department of Pennsylvania #1

27 April 1861-17 August 1861

Robert Patterson 27 April 1861-25 July 1861

John Adams Dix 25 July 1861-17 August 1861

27 April 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 transferred from the Department of Washington to the Department of Pennsylvania.

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

9 May 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.

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

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

25 July 1861:Washington and Allegheny counties of Maryland transferred from the Department of Pennsylvania to the Department of the Shenandoah.

25 July 1861:The Department of Maryland was discontinued, and incorporated into the Department of Pennsylvania.

25 July 1861:All the parts of Pennsylvania in the Department of the Ohio transferred to the Department of Pennsylvania.

25 July 1861:All the parts of Pennsylvania in the Department of Maryland transferred to the Department of Pennsylvania

25 July 1861: Major-General John Adams Dix assumed command of the Department of Pennsylvania, succeeding State Major-General Robert Patterson.

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

17 August 1861: The Department of Pennsylvania was discontinued, and incorporated into the Department of the Potomac. The state of Pennsylvania remained under state command.

Department of Pennsylvania #2

1 December 1864-27 June 1865

George Cadwalader 1 December 1864-27 June 1865

1 December 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.

1 December 1864: Major-General George Cadwalader assumed command of the Department of Pennsylvania.

1 December 1864: The District of Philadelphia was established in the Department of Pennsylvania.

1 December 1864: The District of the Monongahela transferred from the Department of the Susquehanna to the Department of Pennsylvania.

15 June 1865: The District of Philadelphia was discontinued.

27 June 1865: Juniata District was discontinued.

27 June 1865: The District of the Monongahela was discontinued.

27 June 1865: The Department of Pennsylvania was discontinued, and its territory incorporated into the Middle Department and the Department of the Ohio.

Department of the Susquehanna

9 June 1863-1 December 1864

Darius Nash Couch 9 June 1863-1 December 1864

9 June 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.

9 June 1863: Major-General Darius Nash Couch was appointed to command the Department of the Susquehanna, arriving on 11 June 1863.

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

20 August 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.

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

27 June 1864: The 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.

31 July 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.

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

7 August 1864: Major-General Darius Nash Couch retained command of the Department of the Susquehanna.

18 August 1864: The District of Brandywine was discontinued.

6 September 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.

1 December 1864: The District of the Monongahela transferred from the Department of the Susquehanna to the Department of Pennsylvania.

1 December 1864: Juniata District transferred from the Department of the Susquehanna to the Department of Pennsylvania.

1 December 1864: Lehigh District was discontinued.

1 December 1864: The Department of the Susquehanna was discontinued, and its territory transferred to the Department of Pennsylvania.

Department of Washington, District of Columbia #1

9 April 1861-17 August 1861

Charles Ferguson Smith 9 April 1861-21 April 1861

Robert Patterson 22 April 1861-26 April 1861 interim 27 April 1861

Joseph King Fenno Mansfield 27 April 1861-17 August 1861

9 April 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.

9 April 1861: Lieutenant-Colonel Charles Ferguson Smith was appointed to command the Department of Washington, arriving on 10 April 1861.

9 April 1861: Colonel Charles W Sandford took de facto temporary command of all field forces on the Virginia side of the Potomac River.

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

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

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

27 April 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 transferred from the Department of Washington to the Department of Pennsylvania.

27 April 1861: Colonel Joseph King Fenno Mansfield was appointed to command the Department of Washington, arriving on 28 April 1861.

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

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

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

25 July 1861: Brigadier-General Joseph King Fenno Mansfield retained command of the Department of Washington.

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

Department of Washington, District of Columbia #2

2 February 1863-31 December 1865

Samuel Peter Heintzelman 2 February 1862-13 October 1863

Christopher Columbus Augur 13 October 1863-7 June 1865

John Grubb Parke temporary 7 June 1865-26 June 1865

Christopher Columbus Augur 26 June 1865-31 December 1865

2 February 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.

2 February 1863: Major-General Samuel Peter Heintzelman was appointed to command the Department of Washington, arriving on 7 February 1863.

2 February 1863: XXII Corps Washington was established in the Department of Washington.

2 February 1863: The District of Alexandria was established in the Department of Washington.

2 February 1863: The District of Washington was established in the Department of Washington.

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

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

21 June 1864: St Mary’s county, Maryland, transferred from the Department of Virginia and North Carolina to the Department of Washington.

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

7 July 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.

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

7 August 1864: Major-General Christopher Columbus Augur retained command of the Department of Washington.

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

26 April 1865: The District of Patuxent was established in the Department of Washington.

26 April 1865: The District of the Northern Neck was established in the Department of Washington.

26 April 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.

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

18 May 1865: The District of Patuxent was discontinued.

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

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

26 June 1865: XXII Corps Washington was discontinued.

27 June 1865: The Department of Washington transferred from the Middle Military Division to the Military Division of the Atlantic. It was redefined to comprise the District of Columbia, Montgomery county, that part of Anne Arundel county south of the Annapolis & Elkridge Railroad including Annapolis and Prince George’s, Calvert, Charles and St Mary’s counties in Maryland, and Alexandria and Fairfax counties in Virginia. These territories were taken from the Middle Department, the Department of the Potomac, and the Department of Washington.

27 June 1865: Major-General Christopher Columbus Augur retained command of the Department of Washington.

27 June 1865: The District of Alexandria was discontinued.

27 July 1865: IX Corps Washington was discontinued.

2 August 1865: The District of Washington was discontinued.

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