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 into 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, and were reformed, 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

Chronological List (in order of establishment)

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

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

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.
3 July 1861: The Army of the West transferred from the Department of the West to the Western Department.
10 August 1861: The Army of the West was discontinued.

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

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.
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 were 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.
3 March 1862: I Corps Potomac was established in the Army of the Potomac. II Corps Potomac was established in the Army of the Potomac. III Corps Potomac was established in the Army of the Potomac. IV Corps Potomac was established in the Army of the Potomac. V Corps Potomac was established in the Army of the Potomac.
4 April 1862: I Corps Potomac was discontinued, and its forces were incorporated into the Department of the Rappahannock. V Corps Potomac was discontinued, and its forces were incorporated into the Department of the Shenandoah.
18 May 1862: Provisional V Corps Potomac was established in the Army of the Potomac. Provisional VI Corps Potomac was established in the Army of the Potomac.
22 July 1862: V Provisional Corps Potomac was confirmed as V Corps Potomac. VI Provisional Corps Potomac was confirmed as VI Corps Potomac. 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 were incorporated into the Army of the Potomac. III Corps Virginia was discontinued and incorporated into I Corps Potomac. I Corps Potomac was established, comprising the discontinued III Corps Army of Virginia. I Corps Virginia was discontinued, and incorporated into XI Corps Potomac. XI Corps was established in the Army of the Potomac, comprising the discontinued I Corps Virginia. II Corps Virginia was discontinued, and incorporated into XII Corps Potomac. XII Corps was established in the Army of the Potomac, comprising the discontinued II Corps Virginia.
14 November 1862: The Army of the Potomac was reorganised into four Grand Divisions. The Centre Grand Division was established in the Army of the Potomac to comprise III Corps Potomac and V Corps Potomac. The Left Grand Division was established in the Army of the Potomac to comprise I Corps Potomac and VI Corps Potomac. The Right Grand Division was established in the Army of the Potomac to comprise II Corps Potomac and IX Corps Potomac. The Reserve Grand Division was established in the Army of the Potomac to comprise XI Corps Potomac and XII Corps Potomac.
5 February 1863: The Centre Grand Division of the Army of the Potomac was discontinued. The Right Grand Division of the Army of the Potomac was discontinued. The Left Grand Division of the Army of the Potomac was discontinued. The Reserve Grand Division of the Army of the Potomac was discontinued. IX Corps Potomac transferred from the Army of the Potomac to the Department of Virginia.
12 February 1863: Cavalry Corps Potomac was established in the Army of the Potomac.
25 September 1863: XI Corps Potomac transferred from the Army of the Potomac to Hooker’s Command Cumberland. XII Corps Potomac transferred from the Army of the Potomac to Hooker’s Command Cumberland.
24 March 1864: I Corps Potomac was discontinued, and its forces were allocated to V Corps Potomac. III Corps Potomac was discontinued, and its forces allocated between 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.
6 December 1864: 6 December 1864: VI Corps Shenandoah transferred from the Army of the Shenandoah to the Army of the 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. 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.
28 June 1865: II Corps Potomac was discontinued. V Corps Potomac was discontinued. VI Corps Potomac was discontinued. The Army of the Potomac 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, comprising mainly forces from the former Army of the West.
24 October 1861: The Western Army 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.
11 March 1862: The Army of the Ohio transferred to the Department of the Mississippi.
19 August 1862: The Army of the Ohio transferred from the Department of the Mississippi to the Department of the Ohio.
29 September 1862: I Corps Ohio was established in the Army of the Ohio. II Corps Ohio was established in the Army of the Ohio. III Corps Ohio was established in the Army of the Ohio from the “Army of Kentucky”
24 October 1862: The Army of the Ohio was discontinued and its forces were transferred to the Army of the Cumberland as XIV Corps Cumberland. Although the Department of the Ohio had not existed between 11 March and 19 August 1862 the title “Army of the Ohio” continued in unofficial use until 24 October 1862.

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

Army of the Southwest (“Army of Southwest Missouri”)
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 or “Army of Southwest Missouri” was established in the District of Southwest Missouri.
19 September 1862: The Army of the Southwest transferred from the District of Southwest Missouri to the Department of the Missouri.
12 December 1862: The Army of the Southwest 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”.
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”.
16 October 1862: The Army of West Tennessee was discontinued, and incorporated into the Army of the Tennessee.

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.
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 from 16 December 1862 retrospectively.
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 of its forces were assigned to form Reserve Corps Gulf. Reserve Corps Gulf was established in the Department of the Gulf.
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. XIII Corps Gulf was re-established in the Army of the Gulf, composed largely of troops previously in Reserve Corps Gulf. The Detachment Army of the Tennessee was discontinued, reverted to the name XVI Corps Gulf, and transferred to the Army of the Gulf. XVI Corps Gulf was established in 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.
27 June 1865: XIII Corps Gulf transferred from the Army of the Gulf to the Military Division of the Gulf. XVI Corps Gulf transferred from the Army of the Gulf to the Military Division of the Gulf. The Army of the Gulf 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 1 March 1862. It comprised the forces of the former Army of Western Missouri.
27 February 1862: The Army of the Mississippi transferred to the District of the Mississippi.
11 March 1862: The Army of the Mississippi transferred from the District of the Mississippi 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 West 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.

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. I Corps Virginia was established in the Army of Virginia, comprising the field forces formerly in the Mountain Department. II Corps Virginia was established in the Army of Virginia, comprising the field forces formerly in the Department of the Shenandoah. III Corps Virginia was established in the Army of Virginia, comprising the field forces formerly in the Department of the Rappahannock.
2 September 1862: The Army of Virginia transferred to the Department of the Potomac. 
12 September 1862: I Corps Virginia was discontinued, and renamed XI Corps Potomac. II Corps Virginia was discontinued and renamed XII Corps Potomac.I II Corps Virginia was discontinued and renamed I Corps Potomac. The Army of Virginia was discontinued, and its forces were incorporated into the Army of the Potomac.

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

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

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.
7 August 1863: The Army of the Frontier 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.
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. 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. XVI Corps Tennessee was designated in the Army of the Tennessee. 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. Left Wing XIII Corps Tennessee was discontinued, and incorporated into XVI Corps Tennessee and Left Wing XVI Corps Tennessee. Right Wing XIII Corps Tennessee was discontinued, and incorporated into XV Corps Tennessee. XV Corps Tennessee was established in the Army of the Tennessee. XVI Corps Tennessee was established in the Army of the Tennessee. Left Wing XVI Corps Tennessee was established in the Army of the Tennessee. 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. XIII Corps Tennessee was temporarily discontinued, and renamed unofficially as “I Corps Mississippi”. The unofficial “I Corps Mississippi” was established in the “Army of the Mississippi” from the forces in XIII Corps Tennessee. XV Corps Tennessee was temporarily discontinued, and renamed unofficially as “II Corps Mississippi”. 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. The unofficial “I Corps Mississippi” was discontinued, and re-designated as XIII Corps Tennessee. 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.
7 March 1864: Right Wing XVI Corps Tennessee was established in the Army of the Tennessee.
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. Left Wing XVI Corps Tennessee was discontinued. 
24 November 1864: The Army of the Tennessee transferred from the Department of the Tennessee to the Military Division of the Mississippi. 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 were incorporated into XVI Corps Gulf.
1 August 1865: XV Corps Tennessee was discontinued. XVII Corps Tennessee was discontinued. The Army of the Tennessee 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. XIV Corps Cumberland was established in the Army of the Cumberland, incorporating the former Army of the Ohio. I Corps Cumberland was established in the Army of the Cumberland. II Corps Cumberland was established in the Army of the Cumberland. III Corps Cumberland was established in the Army of the Cumberland. 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. II Corps Cumberland was discontinued and renamed Left Wing XIV Corps Cumberland. 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. Right Wing XIV Corps Cumberland was discontinued and renamed XX Corps Cumberland. XX Corps Cumberland was established in the Army of the Cumberland, comprising the former Right Wing XIV Corps Cumberland. Left Wing XIV Corps Cumberland was discontinued, and renamed XXI Corps Cumberland. 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. Reserve Corps Cumberland was established in the Department of the Cumberland, incorporating the former Army of Kentucky.
25 September 1863: Hooker’s Command Cumberland was established in the Department of the Cumberland. XI Corps Potomac transferred from the Army of the Potomac to Hooker’s Command Cumberland. XII Corps Potomac transferred from the Army of the Potomac to Hooker’s Command Cumberland.
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. 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.
14 April 1864: Hooker’s Command Cumberland was discontinued, and its forces were incorporated into XX Corps Cumberland. XI Corps Cumberland was discontinued and incorporated into XX Corps Cumberland. XII Corps Cumberland was discontinued and incorporated into XX Corps Cumberland. 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”. XIV Corps Cumberland transferred from the Army of the Cumberland to the “Army of Georgia”.
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.
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 was subordinated to the Military Division of the Mississippi.
1 August 1865: The Army of the Cumberland was discontinued.

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

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.
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 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. XIII Corps Tennessee was temporarily discontinued, and renamed unofficially as “I Corps Mississippi”. XV Corps Tennessee was discontinued, and renamed unofficially as “II Corps Mississippi”.
12 January 1863: The unofficial “I Corps Mississippi” was discontinued, and re-designated as XIII Corps Tennessee. The unofficial “II Corps Mississippi” was discontinued, and re-designated as XV Corps Tennessee. The unofficial “Army of the Mississippi” was discontinued, and its forces transferred to the Army of the Tennessee.

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. 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.
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.
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. XXIII Corps Ohio continued to be described unofficially as the “Army of the Ohio”.

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

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.
6 January 1864: The Army of Arkansas transferred from the Department of the Missouri to the Department of Arkansas. VII Corps Arkansas was established in the Army of Arkansas.
1 August 1865: The Army of Arkansas was discontinued.

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. XVIII Corps Virginia and North Carolina transferred from the Department of Virginia and North Carolina to the Army of North Carolina
25 April 1863:  XVIII Corps North Carolina transferred from the Army of North Carolina to the Department of Virginia and North Carolina. The Army of North Carolina was discontinued, and its field forces were transferred to the Department of Virginia and North Carolina.

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. 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. XVIII Corps James was discontinued. XXIV Corps was established in the Army of the James. XXV Corps was established in the Army of the James by consolidating the black divisions of X Corps and XVIII Corps.
18 January 1865: The Army of the James transferred interim from the Department of Virginia and North Carolina to the Department of Virginia.
31 January 1865: The Army of the James transferred officially to the Department of Virginia.
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. The Army of the James was discontinued.

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.
3 July 1864: The Army of the Shenandoah was discontinued, and part of the forces were 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. Cavalry Corps Shenandoah was established in the Army of the Shenandoah. VI Corps Potomac transferred from the Army of the Potomac to the Army of the Shenandoah.
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.
20 March 1865: XIX Corps Shenandoah was discontinued.
25 March 1865: Cavalry Corps Shenandoah was discontinued and its forces were incorporated into Sheridan’s Cavalry Command Potomac on 26 March 1865.
27 June 1865: The Army of the Shenandoah was discontinued.

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

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.
8 November 1864: The Army of the Border 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. XX Corps Cumberland transferred from the Army of the Cumberland to the “Army of Georgia”. XIV Corps Cumberland transferred from the Army of the Cumberland to the “Army of Georgia”.
28 March 1865: The title of Army of Georgia was officially confirmed, comprising XIV Corps Georgia and XX Corps Georgia. XIV Corps was assigned officially to the Army of Georgia. XX Corps 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 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. The Army of the Gulf was subordinated to the Army of West Mississippi.
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.

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