Union Organisations – Armies

Union Organisations – Armies

Military forces were combined in varying sizes and levels of complexity for active operations. The basic building blocks for combat operations were Regiments of infantry and cavalry. These were grouped into Brigades, and Brigades were grouped into Divisions. As forces grew in size, divisions were grouped in to Corps or other equivalent formations. An Army could designate a force as small as a few brigades or as number dozens of brigades in their respective divisions and Corps.

A force might be termed an Army if it was operating with a degree of autonomy. An Army could number a few thousand men or over a hundred thousand men. They grew and shrank, were formed, disbanded, or merged as operations demanded. An Army commander would lead any number of Brigades and Divisions. From 1862 onwards, most Armies were sub-divided into one or more Corps (more properly termed Army Corps), made up of two or three or more Divisions. It was usual for forces of more than one Union Corps to be termed an Army but some Armies comprised only one or even no Corps.

Alphabetical Index

Army of Arkansas 27 July 1863-1 August 1865

Army of the Border (Kansas) 14 October 1864-8 November 1864

Army of the Cumberland 24 October 1862-1 August 1865

Army of the Frontier 12 October 1862-7 August 1863

Army of Georgia 7 November 1864-17 June 1865

Army of the Gulf 23 February 1862-27 June 1865

Army of the James 28 April 1864-1 August 1865

Army of the Kanawha 2 July 1863-8 August 1864

Army of Kansas 16 August 1862-19 September 1862

Army of Kentucky #1 25 August 1862-30 August 1862

Army of Kentucky #2 17 November 1862-20 January 1863

Army of West Mississippi 18 February 1865-3 June 1865

Army of the Mississippi #1 23 February 1862-24 October 1862

Army of the Mississippi #2 4 January 1863-12 January 1863

Army of Western Missouri 3 December 1861-12 February 1862

Army of Southeastern Missouri 3 November 1862-26 March 1863

Army of Southwestern Missouri 1 October 1862-12 October 1862

Army of North Carolina 16 August 1863-25 April 1864

Army of Occupation (Western Virginia) 14 June 1861-19 September 1861

Army of the Ohio #1 9 November 1861-24 October 1862

Army of the Ohio #2 11 April 1863-2 February 1865

Army of the Potomac 25 July 1861-28 June 1865

Army of the Shenandoah #1 2 June 1861-17 August 1861

Army of the Shenandoah #2 21 May 1864-3 July 1864

Army of the Shenandoah #3 7 August 1864-27 June 1865

Army of the Southwest 25 December 1861-12 December 1862

Army of the Tennessee 16 October 1862-1 August 1865

Army of West Tennessee 21 February 1862-16 October 1862

Army of Virginia 26 June 1862-12 September 1862

Army of Northeastern Virginia 8 July 1861-25 July 1861

Army of West Virginia 8 August 1864-19 December 1864

Army of the West 2 July 1861-10 August 1861

Western Army 24 September 1861-24 October 1861

Army of Arkansas

27 July 1863-1 August 1865

Frederick Steele 27 July 1863-21 December 1864

Joseph Jones Reynolds 22 December 1864-1 August 1865

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

25 July 1863: Major-General Frederick Steele assumed command of the Army of Arkansas.

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

6 January 1864: Major-General Frederick Steele retained command of the Army of Arkansas.

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

6 January 1864: Major-General Frederick Steele retained command of the Army of Arkansas.

6 January 1864: VII Corps Arkansas was established in the Army of Arkansas.

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

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

1 August 1865: The Army of Arkansas was discontinued.

Army of the Border (Kansas)

14 October 1864-8 November 1864

Samuel Ryan Curtis 14 October 1864-8 November 1864

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

15 October 1864: Major-General Samuel Ryan Curtis assumed command of the Army of the Border.

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

Army of the Cumberland

24 October 1862-1 August 1865

William Starke Rosecrans 24 October 1862-19 October 1863

George Henry Thomas 19 October 1863-1 August 1865

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

24 October 1862: Major-General William Starke Rosecrans assumed command of the Army of the Cumberland.

24 October 1862: XIV Corps Cumberland was established in the Army of the Cumberland, incorporating the former Army of the Ohio.

24 October 1862: I Corps Cumberland was established in the Army of the Cumberland.

24 October 1862: II Corps Cumberland was established in the Army of the Cumberland.

24 October 1862: III Corps Cumberland was established in the Army of the Cumberland.

24 October 1862: Cavalry Corps Cumberland was established in the Army of the Cumberland.

5 November 1862: I Corps Cumberland was discontinued, and renamed Right Wing XIV Corps Cumberland.

5 November 1862: II Corps Cumberland was discontinued, and renamed Left Wing XIV Corps Cumberland.

5 November 1862: III Corps Cumberland was discontinued, and renamed Centre XIV Corps Cumberland.

9 January 1863: Centre XIV Corps Cumberland was discontinued, and renamed XIV Corps Cumberland.

9 January 1863: Right Wing XIV Corps Cumberland was discontinued, and renamed XX Corps Cumberland.

9 January 1863: XX Corps Cumberland was established in the Army of the Cumberland, comprising the former Right Wing XIV Corps Cumberland.

9 January 1863: Left Wing XIV Corps Cumberland was discontinued, and renamed XXI Corps Cumberland.

9 January 1863: XXI Corps Cumberland was established in the Army of the Cumberland, comprising forces from Left Wing XIV Corps Cumberland.

8 June 1863: The “Army of Kentucky”, operating unofficially in the Army of the Cumberland since 20 January 1863, was discontinued.

8 June 1863: Reserve Corps Cumberland was established in the Department of the Cumberland, incorporating the former Army of Kentucky.

25 September 1863: Hooker’s Command Cumberland established in the Department of the Cumberland.

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

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

28 September 1863: IV Corps Cumberland was established in the Army of the Cumberland.

9 October 1863: XX Corps Cumberland was discontinued, and incorporated into IV Corps Cumberland.

9 October 1863: XXI Corps Cumberland was discontinued, and incorporated into IV Corps Cumberland.

9 October 1863: Reserve Corps Cumberland was discontinued, and incorporated into IV Corps Cumberland.

19 October 1863: Major-General George Henry Thomas assumed command of the Army of the Cumberland, succeeding Major-General William Starke Rosecrans.

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

14 April 1864: XI Corps Cumberland was discontinued, and its forces incorporated into XX Corps Cumberland.

14 April 1864: XII Corps Cumberland was discontinued, and its forces incorporated into XX Corps Cumberland.

14 April 1864: XX Corps Cumberland was established in the Army of the Cumberland.

29 October 1864: Cavalry Corps Cumberland was discontinued.

7 November 1864: XX Corps Cumberland transferred from the Army of the Cumberland to the “Army of Georgia”.

7 November 1864: XIV Corps Cumberland transferred from the Army of the Cumberland to the “Army of Georgia”.

January 17 2865: 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.

1 April 1865: IV Corps Cumberland 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.

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

27 June 1865: Major-General George Henry Thomas retained command of the Army of the Cumberland.

1 August 1865: The Army of the Cumberland was discontinued.

Army of the Frontier

12 October 1862-7 August 1863

John McAllister Schofield 12 October 1862-19 November 1862

James Gilpatrick Blunt temporary 20 November 1862-28 December 1862

John McAllister Schofield 29 December 1862-29 March 1863

Francis Jay Herron 30 March 1863-7 August 1863

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.

12 October 1862: Brigadier-General John McAllister Schofield assumed command of the Army of the Frontier.

20 November 1862: Brigadier-General James Gilpatrick Blunt assumed temporary command of the Army of the Frontier, succeeding Major-General John McAllister Schofield.

29 December 1862: Brigadier-General John McAllister Schofield assumed command of the Army of the Frontier, succeeding Major-General James Gilpatrick Blunt.

30 March 1863: Major-General Francis Jay Herron assumed command of the Army of the Frontier, succeeding Major-General John McAllister Schofield.

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

Army of Georgia

7 November 1864-17 June 1865

Henry Warner Slocum 7 November 1864-17 June 1865

7 November 1864: The “Army of Georgia” was established unofficially in the Military Division of the Mississippi, comprising XIV Corps Cumberland and XX Corps Cumberland.

7 November 1864: Major-General Henry Warner Slocum assumed command of the “Army of Georgia.”

7 November 1864: XX Corps Cumberland transferred from the Army of the Cumberland to the “Army of Georgia”.

7 November 1864: XIV Corps Cumberland transferred from the Army of the Cumberland to the “Army of Georgia”.

28 March 1865: The Army of Georgia was officially confirmed, comprising XIV Corps Georgia and XX Corps Georgia.

28 March 1865: Major-General Henry Warner Slocum retained command of the Army of Georgia.

28 March 1865: XIV Corps Cumberland was assigned officially to the Army of Georgia.

28 March 1865: XX Corps Cumberland was assigned officially to the Army of Georgia.

1 June 1865: XX Corps Georgia was discontinued.

17 June 1865: XIV Corps Georgia transferred from the Army of Georgia to the Military Division of the Mississippi.

17 June 1865: The Army of Georgia was discontinued.

Army of the Gulf

23 February 1862-27 June 1865

Benjamin Franklin Butler 23 February 1862-14 December 1862

Nathaniel Prentiss Banks 15 December 1862-22 September 1864

Stephen Augustus Hurlbut temporary 23 September 1864-21 April 1865

Nathaniel Prentiss Banks 22 April 1865-3 June 1865

Edward Richard Sprigg Canby 3 June 1865-27 June 1865

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

23 February 1862: Major-General Benjamin Franklin Butler assumed command of the Army of the Gulf.

15 December 1862: Major-General Nathaniel Prentiss Banks assumed command of the Army of the Gulf, succeeding Major-General Benjamin Franklin Butler.

16 December 1862: XIX Corps Gulf was designated in the Army of the Gulf, comprising all field forces in the Department of the Gulf, and confirmed retroactively on 5 January 1863.

5 January 1863: XIX Corps Gulf was officially established retrospectively from 16 December 1862.

7 August 1863: XIII Corps Tennessee transferred from the Army of the Tennessee to the Amy of the Gulf.

11 June 1864: XIII Corps Gulf was discontinued, and most its forces assigned to form Reserve Corps Gulf. Reserve Corps Gulf was established in the Department of the Gulf.

23 September 1864: Major-General Stephen Augustus Hurlbut assumed temporary command of the Army of the Gulf, succeeding Major-General Nathaniel Prentiss Banks.

7 November 1864: XIX Corps Gulf was discontinued. The elements of 1st Division and 2nd Division, known as ‘Detachment XIX Corps’ while serving in the Shenandoah Valley were officially designated XIX Corps Shenandoah. The 3rd Division remained in Louisiana with the interim title XIX Corps Gulf.

17 January 1865: Reserve Corps Gulf was discontinued.

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

18 February 1865: Major-General Stephen Augustus Hurlbut retained command of the Army of the Gulf.

18 February 1865: XIII Corps Gulf was established in the Army of the Gulf, composed largely of troops previously in Reserve Corps Gulf.

18 February 1865: The Detachment Army of the Tennessee was discontinued, and reverted to the name XVI Corps Gulf, and transferred to the Army of the Gulf.

18 February 1865: XVI Corps Gulf was established in the Army of the Gulf.

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

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

3 June 1865: Major-General Edward Richard Sprigg Canby assumed command of the Army of the Gulf, succeeding Major-General Benjamin Franklin Butler.

27 June 1865: XIII Corps Gulf transferred from the Army of the Gulf to the Military Division of the Gulf.

27 June 1865: XVI Corps Gulf transferred from the Army of the Gulf to the Military Division of the Gulf.

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

Army of the James

28 April 1864-1 August 1865

Benjamin Franklin Butler 28 April 1864-7 January 1865

Edward Otho Cresap Ord 8 January 1865-1 August 1865

28 April 1864: The Army of the James was established in the Department of Virginia and North Carolina.

28 April 1864: Major-General Benjamin Franklin Butler assumed command of the Army of the James.

28 April 1864: X Corps South transferred from the Department of the South to the Army of the James.

2 May 1864: XVIII Corps Virginia and North Carolina transferred from the Department of Virginia and North Carolina to the Army of the James.

3 December 1864: X Corps James was discontinued.

3 December 1864: XVIII Corps James was discontinued.

3 December 1864: XXIV Corps was established in the Army of the James.

3 December 1864: XXV Corps was established in the Army of the James by consolidating the black divisions of X Corps and XVIII Corps.

8 January 1865: Major-General Edward Otho Cresap Ord assumed command of the Army of the James, succeeding Major-General Benjamin Franklin Butler.

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: Major-General Edward Otho Cresap Ord retained command of the Army of the James.

31 January 1865: The Army of the James transferred officially to the Department of Virginia.

31 January 1865: Major-General Edward Otho Cresap Ord retained command of the Army of the James.

26 March 1865: The cavalry of the Army of the James transferred to Sheridan’s Cavalry Command Potomac.

23 May 1865: XXV Corps James transferred from the Army of the James to the Military Division of the Southwest.

1 August 1865: XXIV Corps James was discontinued.

1 August 1865: The Army of the James was discontinued.

Army of the Kanawha

2 July 1863-8 August 1864

George Crook 2 July 1863-8 August 1864

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

2 July 1863: Brigadier-General George Crook assumed command of the Army of the Kanawha.

8 August 1864: The Army of the Kanawha was discontinued, and its forces incorporated into the Army of West Virginia.

Army of Kansas

16 August 1862-19 September 1862

James Gilpatrick Blunt 16 August 1862-19 September 1862

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

16 August 1862: Brigadier-General James Gilpatrick Blunt assumed command of the Army of Kansas.

19 September 1862: The Army of Kansas was discontinued.

Army of Kentucky #1

25 August 1862-30 August 1862

William Nelson 25 August 1862-30 August 1862

25 August 1862: The Army of Kentucky was established in the Department of the Ohio from field forces of the former Department of Kentucky.

25 August 1862: Brigadier-General William Nelson assumed command of the Army of Kentucky.

30 August 1862: The Army of Kentucky was discontinued, and integrated into the Army of the Ohio, retaining the unofficial name “Army of Kentucky”.

Army of Kentucky #2

17 November 1862-20 January 1863

Gordon Granger 17 November 1862-20 January 1863

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

17 November 1862: Major-General Gordon Granger assumed command of the Army of Kentucky.

20 January 1863: The Army of Kentucky was discontinued. The term was used unofficially until 8 June 1863, when these forces were renamed Reserve Corps Cumberland.

Army of West Mississippi

18 February 1865-3 June 1865

Edward Richard Sprigg Canby 18 February 1865-3 June 1865

18 February 1865: The Army of West Mississippi was established in the Military Division of West Mississippi.

18 February 1865: Major-General Edward Richard Sprigg Canby assumed command of the Army of West Mississippi.

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

17 May 1865: The Military Division of West Mississippi also referred to as the Trans-Mississippi Division was officially discontinued to be replaced by the Military Division of the Southwest. However, 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.

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 Army of West Mississippi was discontinued.

Army of the Mississippi #1

23 February 1862-24 October 1862

John Pope 23 February 1862-26 June 1862

William Starke Rosecrans 26 June 1862-24 October 1862

23 February 1862: The Army of the Mississippi was officially announced for the proposed Department of the Mississippi, which would be formally established on March 1 1862. It comprised the forces of the former Army of Western Missouri.

23 February 1862: Brigadier-General John Pope assumed command of the Army of the Mississippi.

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

27 February 1862: Brigadier-General John Pope retained command of the Army of the Mississippi.

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

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

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

11 March 1862: Major-General John Pope retained command of the Army 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.

26 June 1862: Major-General William Starke Rosecrans assumed command of the Army of the Mississippi, succeeding Major-General John Pope.

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

16 October 1862: Major-General William Starke Rosecrans retained command of the Army of the Mississippi.

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

Army of the Mississippi #2

4 January 1863-12 January 1863

John Alexander McClernand 4 January 1863-12 January 1863

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

4 January 1863: Major-General John Alexander McClernand assumed command of the unofficial “Army of the Mississippi”.

4 January 1863: XIII Corps Tennessee was temporarily discontinued, and renamed unofficially as “I Corps Mississippi”.

4 January 1863: The unofficial “I Corps Mississippi” was established in the “Army of the Mississippi” from the forces in XIII Corps Tennessee.

4 January 1863: XV Corps Tennessee was discontinued, and renamed unofficially as “II Corps Mississippi”.

4 January 1863: The unofficial “II Corps Mississippi” was established in the Army “of the Mississippi”.

12 January 1863: The unofficial “I Corps Mississippi” was discontinued, and re-designated as XIII Corps Tennessee.

12 January 1863: The unofficial “II Corps Mississippi” was discontinued, and re-designated as XV Corps Tennessee.

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

Army of Western Missouri

3 December 1861-12 February 1862

John Pope 3 December 1861-12 February 1862

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

3 December 1861: Brigadier-General John Pope assumed command of the Army of Western Missouri.

12 February 1862 The Army of Western Missouri was discontinued, and later incorporated into the Army of the Mississippi.

Army of Southeastern Missouri

3 November 1862-26 March 1863

John Wynn Davidson 3 November 1862-26 March 1863

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

3 December 1862: Brigadier-General John Wynn Davidson assumed command of the Army of Southeastern Missouri.

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

Army of Southwestern Missouri

1 October 1862-12 October 1862

John McAllister Schofield 1 October 1862-12 October 1862

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

1 October 1862: Brigadier-General John McAllister Schofield assumed command of the Army of Southwestern Missouri.

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

Army of North Carolina

16 August 1863-25 April 1864

John James Peck 16 August 1863-25 April 1864

16 August 1863: The Army of North Carolina was established in the Department of Virginia and North Carolina.

16 August 1863: Major-General John James Peck assumed command of the Army of North Carolina.

25 April 1864:  XVIII Corps North Carolina transferred from the Army of North Carolina 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.

Army of Occupation (Western Virginia)

14 June 1861-19 September 1861

George Brinton McClellan 14 June 1861-22 July 1861

William Starke Rosecrans 23 July 1861-19 September 1861

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

14 June 1861: Major-General George Brinton McClellan assumed command of the Army of Occupation Ohio.

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

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

Army of the Ohio #1

9 November 1861-24 October 1862

Don Carlos Buell 9 November 1861-30 September 1862

George Henry Thomas temporary 30 September 1862-1 October 1862

Don Carlos Buell 1 October 1862-24 October 1862

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

9 November 1861: Brigadier-General Don Carlos Buell was appointed to command the Army of the Ohio, arriving on 15 November 1861.

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

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

11 March 1862: Major-General Don Carlos Buell retained command of the Army of the Ohio.

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

19 August 1862: Major-General Don Carlos Buell retained command of the Army of the Ohio.

29 September 1862: I Corps Ohio was established in the Army of the Ohio.

29 September 1862: II Corps Ohio was established in the Army of the Ohio.

29 September 1862: III Corps Ohio was established in the Army of the Ohio from the “Army of Kentucky”

30 September 1862: Major-General George Henry Thomas assumed temporary command of the Army of the Ohio, succeeding Major-General Don Carlos Buell.

1 October 1862: Major-General Don Carlos Buell assumed command of the Army of the Ohio, succeeding Major-General George Henry Thomas.

24 October 1862: The Army of the Ohio was discontinued, and its forces transferred to the Army of the Cumberland as XIV Corps Cumberland. Although the Department of the Ohio had not existed between March 11 and August 19 1862 the name “Army of the Ohio” continued to be used unofficially until 24 October 1862.

Army of the Ohio #2

11 April 1863-2 February 1865

Ambrose Everett Burnside 11 April 1863-9 December 1864

John Gray Foster 9 December 1864-9 February 1864

John McAllister Schofield 9 February 18645 May 1864

Jacob Dolson Cox temporary 5 May 1864-28 May 1864

John McAllister Schofield 28 May 1864-2 February 1865

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

11 April 1863: Major-General Ambrose Everett Burnside assumed command of the Army of the Ohio.

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

28 May 1863: XXIII Corps Ohio was established in the Army of the Ohio.

5 June 1863: IX Corps 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 Army of the Ohio transferred to the Military Division of the Mississippi.

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

30 November 1863: Cavalry Corps Ohio was established in the Army of the Ohio.

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

9 February 1864: Major-General John McAllister Schofield assumed command of the Army of the Ohio, succeeding Major-General John Gray Foster.

10 April 1864: Cavalry Corps Ohio was discontinued.

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

5 May 1864: Brigadier-General Jacob Dolson Cox assumed temporary command of the Army of the Ohio, succeeding Major-General John McAllister Schofield.

28 May 1864: Major-General John McAllister Schofield assumed command of the Army of the Ohio, succeeding Brigadier-General Jacob Dolson Cox.

2 February 1865: XXIII Corps Ohio transferred to the Department of North Carolina but continued to be described unofficially as the “Army of the Ohio”.

2 February 1865: The Army of the Ohio was discontinued, and its field forces transferred as the XVIII Corps Ohio to the Department of North Carolina.

Army of the Potomac

25 July 1861-28 June 1865

Irvin McDowell 25 July 1861-20 August 1861

George Brinton McClellan 20 August 1861-4 November 1862 interim 6 November 1862

Ambrose Everett Burnside 5 November 1862-25 January 1863

Joseph Hooker 26 January 1863-27 June 1863

George Gordon Meade 28 June 1863-31 August 1864

John Grubb Parke temporary 1 September 1864-9 September 1864

George Gordon Meade 10 September 1864-29 December 1864

John Grubb Parke temporary 30 December 1864-10 January 1865

George Gordon Meade 11 January 1865-23 January 1865

John Grubb Parke temporary 24 January 1865-1 February 1865

George Gordon Meade 2 February 1865-21 February 1865

John Grubb Parke temporary 22 February 1865-27 February 1865

George Gordon Meade 28 February 1865-28 June 1865

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

25 July 1861: Major-General Irvin McDowell assumed command of the Army of the Potomac.

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

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

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

20 August 1861: Major-General George Brinton McClellan assumed command of the Army of the Potomac, succeeding Major-General Irvin McDowell.

3 March 1862: I Corps Potomac was established in the Army of the Potomac.

3 March 1862: II Corps Potomac was established in the Army of the Potomac.

3 March 1862: III Corps Potomac was established in the Army of the Potomac.

3 March 1862: IV Corps Potomac was established in the Army of the Potomac.

3 March 1862: V Corps Potomac was established in the Army of the Potomac.

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.

4 April 1862: I Corps Potomac was discontinued, and its forces incorporated into the Department of the Rappahannock.

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

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

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

22 July 1862: V Provisional Corps Potomac was confirmed as a permanent organisation as V Corps Potomac.

22 July 1862: VI Provisional Corps Potomac was confirmed as a permanent organisation as VI Corps Potomac.

22 July 1862: IX Corps Potomac was established in the Army of the Potomac.

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.

12 September 1862: The Army of Virginia was discontinued, and its forces incorporated into the Army of the Potomac.

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

12 September 1862: I Corps Potomac was established, comprising the discontinued III Corps Army of Virginia.

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

12 September 1862: XI Corps was established in the Army of the Potomac, comprising the discontinued I Corps Virginia.

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

12 September 1862: XII Corps was established in the Army of the Potomac, comprising the discontinued II Corps Virginia.

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

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

14 November 1862: The Army of the Potomac was reorganised into four Grand Divisions.

14 November 1862: The Centre Grand Division was established in the Army of the Potomac to comprise III Corps Potomac and V Corps Potomac.

14 November 1862: The Left Grand Division was established in the Army of the Potomac to comprise I Corps Potomac and VI Corps Potomac.

14 November 1862: The Right Grand Division was established in the Army of the Potomac to comprise II Corps Potomac and IX Corps Potomac.

14 November 1862: The Reserve Grand Division was established in the Army of the Potomac to comprise XI Corps Potomac and XII Corps Potomac.

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

5 February 1863: The Centre Grand Division of the Army of the Potomac was discontinued.

5 February 1863: The Right Grand Division of the Army of the Potomac was discontinued.

5 February 1863: The Left Grand Division of the Army of the Potomac was discontinued.

5 February 1863: The Reserve Grand Division of the Army of the Potomac was discontinued.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

6 May 1865: Cavalry Corps Potomac transferred from Sheridan’s Cavalry Command to the Army of the Potomac.

27 June 1865: Cavalry Corps 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: Major-General George Gordon Meade retained command of the Army of the Potomac.

28 June 1865: II Corps Potomac was discontinued.

28 June 1865: V Corps Potomac was discontinued.

28 June 1865: VI Corps Potomac was discontinued.

28 June 1865: The Army of the Potomac was discontinued.

Army of the Shenandoah #1

2 June 1861-17 August 1861

Robert Patterson 2 June 1861-27 July 1861

Vacant 27 July 1861-17 August 1861

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

2 June 1861: Pennsylvania State Major-General Robert Patterson assumed command of the Army of the Shenandoah.

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

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

Army of the Shenandoah #2

21 May 1864-3 July 1864

David Hunter 21 May 1864-3 July 1864

21 May 1864: The Army of the Shenandoah was established in the Department of West Virginia.

21 May 1864: Major-General David Hunter assumed command of the Army of the Shenandoah.

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

Army of the Shenandoah #3

7 August 1864-27 June 1865

Philip Henry Sheridan 7 August 1864-16 October 1864

Horatio Gouverneur Wright temporary 16 October 1864-19 October 1864

Philip Henry Sheridan 19 October 1864-7 March 1865

Winfield Scott Hancock 7 March 1865-19 April 1865

Alfred Thomas Archimedes Torbert 19 April 1865-27 June 1865

7 August 1864: The Army of the Shenandoah was established in the Middle Military Division.

7 August 1864: Major-General Philip Henry Sheridan assumed command of the Army of the Shenandoah.

7 August 1864: Cavalry Corps Shenandoah was established in the Army of the Shenandoah.

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

16 October 1864: Major-General Horatio Gouverneur Wright assumed temporary command of the Army of the Shenandoah, succeeding Major-General Philip Henry Sheridan.

19 October 1864: Major-General Philip Henry Sheridan assumed command of the Army of the Shenandoah, succeeding Major-General Henry Gouverneur Wright.

7 November 1864: XIX Corps Shenandoah was established in the Army of the Shenandoah. The elements of 1st Division and 2nd Division known as ‘Detachment XIX Corps’ while serving in the Shenandoah Valley were designated XIX Corps Shenandoah while the 1st Division retained the interim title of XIX Corps Gulf.

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

7 March 1865: Major-General Winfield Scott Hancock assumed command of the Army of the Shenandoah, succeeding Major-General Philip Henry Sheridan.

20 March 1865: XIX Corps Shenandoah was discontinued.

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

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

19 April 1865: Brigadier-General Alfred Thomas Archimedes Torbert assumed command of the Army of the Shenandoah, succeeding Major-General Winfield Scott Hancock.

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

Army of the Southwest

25 December 1861-12 December 1862

Samuel Ryan Curtis 25 December 1861-29 August 1862

Frederick Steele 29 August 1862-6 October 1862

Eugene Asa Carr 17 October 1862-11 November 1862

Willis Arnold Gorman temporary 12 November 1862-12 December 1862

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

25 December 1861: Brigadier-General Samuel Ryan Curtis assumed command of the Army of the Southwest.

29 August 1862: Brigadier-General Frederick Steele assumed command of the Army of the Southwest, succeeding Major-General Samuel Ryan Curtis.

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

19 September 1862: Brigadier-General Frederick Steele retained command of the Army of the Southwest.

7 October 1862: Brigadier-General Eugene Asa Carr assumed command of the Army of the Southwest, succeeding Major-General Frederick Steele.

12 November 1862: Brigadier-General Willis Arnold Gorman assumed temporary command of the Army of the Southwest, succeeding Brigadier-General Eugene Asa Carr.

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

Army of the Tennessee

16 October 1862-1 August 1865

Ulysses Simpson Grant 16 October 1862-24 October 1863

William Tecumseh Sherman 24 October 1863-26 March 1864

James Birdseye McPherson 26 March 1864-22 July 1864

John Alexander Logan temporary 22 July 1864-27 July 1864

Oliver Otis Howard 27 July 1864-19 May 1865

John Alexander Logan 19 May 1865-1 August 1865

16 October 1862: The Army of the Tennessee was established in the Department of the Tennessee, comprising the former Army of West Tennessee.

16 October 1862: Major-General Ulysses Simpson Grant assumed command of the Army of the Tennessee.

24 October 1862: XIII Corps was established in the Army of the Tennessee from the Army of the Mississippi and the field forces of the District of Memphis, the District of Corinth, and the District of Jackson. The Army of the Tennessee was initially synonymous with XIII Corps Tennessee.

1 November 1862: Right Wing XIII Corps Tennessee was established in the Army of the Tennessee.

1 November 1862: Left Wing XIII Corps Tennessee was established in the Army of the Tennessee.

27 November 1862: Centre XIII Corps Tennessee was established in the Army of the Tennessee.

18 December 1862: XV Corps Tennessee was designated in the Army of the Tennessee.

18 December 1862: XVI Corps Tennessee was designated in the Army of the Tennessee.

18 December 1862: XVII Corps Tennessee was designated in the Army of the Tennessee.

22 December 1862: Centre XIII Corps Tennessee was discontinued, and incorporated into XVII Corps Tennessee.

22 December 1862: Left Wing XIII Corps Tennessee was discontinued, and incorporated into XVI Corps Tennessee and Left Wing XVI Corps Tennessee.

22 December 1862: Right Wing XIII Corps Tennessee was discontinued, and incorporated into XV Corps Tennessee.

22 December 1862: XV Corps Tennessee was established in the Army of the Tennessee.

22 December 1862: XVI Corps Tennessee was established in the Army of the Tennessee.

22 December 1862: Left Wing XVI Corps Tennessee was established in the Army of the Tennessee.

22 December 1862: XVII Corps Tennessee was established in the Army of the Tennessee.

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

4 January 1863:  XIII Corps Tennessee was temporarily discontinued, and renamed unofficially as “I Corps Mississippi”.

4 January 1863: The unofficial “I Corps Mississippi” was established in the “Army of the Mississippi” from the forces in XIII Corps Tennessee.

4 January 1863: XV Corps Tennessee was temporarily discontinued, and renamed unofficially as “II Corps Mississippi”.

4 January 1863: The unofficial “II Corps Mississippi” was established in the Army “of the Mississippi”.

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

12 January 1863: The unofficial “I Corps Mississippi” was discontinued, and re-designated as XIII Corps Tennessee.

12 January 1863: The unofficial “II Corps Mississippi” was discontinued, and re-designated as XV Corps Tennessee.

7 August 1863: XIII Corps Tennessee transferred from the Army of the Tennessee to the Army of the Gulf.

24 October 1863: Major-General William Tecumseh Sherman assumed command of the Army of the Tennessee, succeeding Major-General Ulysses Simpson Grant.

7 March 1864: Right Wing XVI Corps Tennessee was established in the Army of the Tennessee.

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

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

27 July 1864: Major-General Oliver Otis Howard assumed command of the Army of the Tennessee, succeeding Major-General John Alexander Logan.

7 November 1864: XVI Corps Tennessee was discontinued.

7 November 1864: Right Wing XVI Corps Tennessee was discontinued, and renamed Detachment Army of the Tennessee XVI Corps.

7 November 1864: Left Wing XVI Corps Tennessee was discontinued.

7 November 1864: Detachment Army of the Tennessee XVI Corps established in the Army of the Tennessee.

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

24 November 1864: Detachment Army of the Tennessee XVI Corps transferred from the Army of the Tennessee to the Military Division of the Mississippi.

18 February 1865: Detachment Army of the Tennessee XVI Corps was discontinued, and its forces incorporated into XVI Corps Gulf.

19 May 1865: Major-General John Alexander Logan assumed command of the Army of the Tennessee, succeeding Major-General Oliver Otis Howard.

1 August 1865: XV Corps Tennessee was discontinued.

1 August 1865: XVII Corps Tennessee was discontinued.

1 August 1865: The Army of the Tennessee was discontinued.

Army of West Tennessee

21 February 1862-16 October 1862

Ulysses Simpson Grant 21 February 1862-16 October 1862

21 February 1862: The Army of West Tennessee was established in the District of West Tennessee. The Army was usually but incorrectly referred to as the “Army of the Tennessee”.

21 February 1862: Major-General Ulysses Simpson Grant assumed command of the Army of West Tennessee “Army of the Tennessee”.

11 March 1862: The Army of West Tennessee transferred from the District of West Tennessee to the Department of the Mississippi. The Army of West Tennessee was renamed unofficially the “Army of the Tennessee”.

11 March 1862L Major-General Ulysses Simpson Grant retained command of the Army of West Tennessee.

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

Army of Virginia

26 June 1862-12 September 1862

John Pope 26 June 1862-2 September 1862

George Brinton McClellan 2 September 1862-12 September 1862

26 June 1862: The Army of Virginia was established under the War Department, operating within the territory of but independently of the Department of the Potomac.

26 June 1862: Major-General John Pope assumed command of the Army of Virginia.

26 June 1862: I Corps Virginia was established in the Army of Virginia, comprising the field forces formerly in the Mountain Department.

26 June 1862: II Corps Virginia was established in the Army of Virginia, comprising the field forces formerly in the Department of the Shenandoah.

26 June 1862: III Corps Virginia was established in the Army of Virginia, comprising the field forces formerly in the Department of the Rappahannock.

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

2 September 1862: Major-General George Brinton McClellan assumed command of the Army of Virginia, succeeding Major-General John Pope.

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

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

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

12 September 1862: The Army of Virginia was discontinued, and its forces incorporated into the Army of the Potomac.

Army of Northeastern Virginia

8 July 1861-25 July 1861

Irvin McDowell 8 July 1861-25 July 1861

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

8 July 1861: Brigadier-General Irvin McDowell assumed command of the Army of Northeastern Virginia.

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

Army of West Virginia

8 August 1864-19 December 1864

George Crook 8 August 1864-19 December 1864

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

8 August 1864: Brigadier-General George Crook assumed command of the Army of West Virginia.

19 December 1864: The Army of West Virginia was discontinued and incorporated into the Army of the Shenandoah.

Army of the West

2 July 1861-10 August 1861

Nathaniel Lyon 2 July 1861-10 August 1861

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

2 July 1861: Brigadier-General Nathaniel Lyon assumed command of the Army of the West.

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

3 July 1861: Brigadier-General Nathaniel Lyon retained command of the Army of the West.

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

Western Army

24 September 1861-24 October 1861

John Charles Frémont 24 September 1861-24 October 1861

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

24 September 1861: Major-General John Charles Frémont assumed command of the Western Army.

24 October 1861: The Western Army was discontinued.

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