Union Organisations – Army Corps and Equivalents
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.
Army Corps or Corps
Army Corps (or simply, Corps) were not authorised officially in the Union army until 17 July 1862. However, the term was already in unofficial use prior to this date.
Note: The orthography of numeral for Brigades, Divisions and Corps is a recent convention. During the Civil War, Union army Corps were typically designated in words; for example, First Corps or Twenty-Fifth Corps etc. Divisions and Brigade are normally given ordinal numbers within their Division and Corps, e.g., 1st Brigade, 2nd Division, III Corps. This is often abbreviated in current practice to 1/2/III. The orthography of the time was First Brigade Second Division, Third Corps; with a punctilious regard to punctuation. In this resource, Roman numerals are used to designate a Corps following current convention e. g., XVIII Corps but this was not contemporary usage during the Civil War. At that time, they were normally designated by ordinal numbers, for example, Twenty-First Corps or Twelfth Corps. The orthography of numeral for Brigades, Divisions and Corps is a later convention.
At first, Corps were numbered unofficially to describe large formations within an army; I Corps, II Corps, and III Corps were named in the Army of the Potomac, the Army of Virginia, the Army of the Mississippi unofficially, the Army of the Ohio, and the Army of the Cumberland. This resulted in some duplication of the terms I Corps to VI Corps for different forces. Some designation, for example IV Corps, were used more than once after the initial force was discontinued and a new one designated using the same numeral. After the official authorisation of Corps commands, Corps designations were regularised and ultimately numbered officially from I Corps to XXV Corps, with a few exceptions and duplications. The term “Provisional Corps” was applied to V Corps and VI Corps in Virginia early in 1862. This caused some duplication of the terms I Corps to VI Corps prior to the authorisation of the organisation. After official authorisation of Corps commands, Corps designations were regularised and ultimately numbered officially and without duplication from I Corps to XXV Corps, with a few exceptions.
There were never twenty-five active Army Corps at one time as some Corps were broken up and reformed for temporary operations. Sometimes the designation of their constituents became confused or anomalous. Several Corps were discontinued and some were re-activated or transferred to new Departments. A few Corps remained in existence and comprised substantially similar constituent units from the early years almost until the end of the war e. g., II Corps, VI Corps while others were short-lived. Most Corps were discontinued, merged, or significantly reorganised at least once, and some on several occasions. The transfer in and out of brigades or even divisions from Corps was not common but did happen on occasion. Some Corps designations referred to field forces that never operated as integrated field commands but were largely administrative commands, overseeing reinforcements, training depots, garrisons, or local forces e. g., VIII Corps, XVI Corps, XXII Corps.
The term Wing was used inconsistently. It might describe a group of Corps within an army but it could also be used for the constituent parts within a particular Corps e. g. XIII Corps and XIV Corps had Left Wing and Right Wing and even Centre within them. It was usual for forces of more than one Union Corps to be termed an Army; but some Armies comprised only one Corps.
The term Grand Division was used in the winter of 1862 to designate groups of Army Corps within the Army of the Potomac. This practice was short-lived and not repeated. Major-General William Tecumseh Sherman commanded several Corps for the Atlanta campaign in 1864 and subsequently, but he retained the name of Army for each grouping of Corps (Army of the Cumberland, the Ohio, the Tennessee, Georgia, etc.). Similarly, in 1864 and 1865, Lieutenant-General Ulysses Simpson Grant retained the integrity of the Army of the Potomac and Army of the James for the Virginia campaign of 1864 and 1865, rather than creating Wings of Grand Divisions.
Some Corps numbers were discontinued and revived again with similar forces in the same theatre or the term was re-assigned to wholly different forces and in a different theatre e. g. IV Corps. Some Corps only ever served within one field army or Department while others e. g. IX Corps were transferred from Department to Department. Some Corps designations referred to field forces that never operated as integrated field commands but were largely administrative commands, overseeing reinforcements, training or garrisons or local forces e. g., VIII Corps, XVI Corps.
Alphabetical Index
Centre Grand Division, Potomac 14 November 1862-5 February 1863
Left Grand Division, Potomac 14 November 1862-5 February 1863
Reserve Grand Division, Potomac 14 November 1862-5 February 1863
Right Grand Division. Potomac 14 November 1862-5 February 1863
Hooker’s Command Cumberland 25 September 1863-14 April 1864
Sheridan’s Cavalry Command Potomac 26 March 1865-6 May 1865
I Corps Cumberland 24 October 1862-5 November 1862
I Corps Mississippi 4 January 1863 to 12 January 1863
I Corps Ohio 29 September 1862-24 October 1862
I Corps Potomac #1 3 March 1862-4 April 1862
I Corps Potomac #2 12 September 1862-24 March 1864
I Corps Virginia 26 June 1862 12 September 1862
II Corps Cumberland 24 October 1862-5 November 1862
II Corps Mississippi 4 January 1863 to 12 January 1863
II Corps Ohio 29 September 1862-24 October 1862
II Corps Potomac 3 March 1862-28 June 1865
II Corps Virginia 26 June 1862 12 September 1862
III Corps Cumberland 24 October 1862-5 November 1862
III Corps Ohio 29 September 1862-24 October 1862
III Corps Potomac 3 March 1862-24 March 1864
III Corps Virginia 26 June 1862-12 September 1862
IV Corps Cumberland 28 September 1863-1 April 1865
IV Corps Potomac 3 March 1862-16 August 1862
IV Corps Virginia 16 August 1862-15 July 1863
IV Corps Virginia and North Carolina 15 July 1863-1 August 1863
V Corps Potomac #1 3 March 1862-4 April 1862
V Corps Potomac #2 18 May 1862-28 June 1865
VI Corps Potomac #1 18 May 1862-7 August 1864
VI Corps Potomac #2 6 December 1864-28 June 1865
VI Corps Shenandoah 7 August 1864-6 December 1864
VII Corps Arkansas 6 January 1864-1 August 1865
VIII Corps Atlantic 27 June 1865-1 August 1865
VIII Corps Middle 12 July 1862-27 June 1865
IX Corps Ohio #1 17 March 1863-5 June 1863
IX Corps Ohio #2 25 August 1863-13 April 1864
IX Corps Potomac #1 22 July 1862-3 August 1862
IX Corps Potomac #2 3 September 1862-5 February 1863
IX Corps Potomac #3 13 April 1864-24 April 1865
IX Corps Tennessee 5 June 1863-25 August 1863
IX Corps Virginia #1 3 August 1862-3 September 1862
IX Corps Virginia #2 5 February 1863-17 March 1863
IX Corps Washington 24 April 1865-27 July 1865
X Corps James 28 April 1864-3 December 1864
X Corps North Carolina 23 March 1865-1 August 1865
X Corps South 3 September 1862-28 April 1864
XI Corps Cumberland (Hooker’s Command) 25 September 1863-16 14 April 1864
XI Corps Potomac 12 September 1862-25 September 1863
XII Corps Cumberland (Hooker’s Command 25 September 1863-16 October 1863
XII Corps Potomac 12 September 1862-25 September 1863
XIII Corps Gulf #1 7 August 1863-7 May 1864
XIII Corps Gulf #2 18 February 1865-20 July 1865
XIII Corps Tennessee #1 24 October 1862-4 January 1863
XIII Corps Tennessee #2 12 January 1863-7 August 1863
Centre XIII Corps Tennessee 27 November 1862-22 December 1862
Left Wing XIII Corps Tennessee 1 November 1862-22 December 1862
Right Wing XIII Corps Tennessee 1 November 1862-22 December 1862
XIV Corps Cumberland 24 October 1862-7 November 1864
XIV Corps Georgia 7 November 1864-17 June 1865
XIV Corps Mississippi 17 June 1865-1 August 1865
Centre XIV Corps Cumberland 5 November 1862-9 January 1863
Left Wing XIV Corps Cumberland 5 November 1862-9 January 1863
Right Wing XIV Corps Cumberland 5 November 1862-9 January 1863
XV Corps Tennessee #1 18 December 1862-4 January 1863
XV Corps Tennessee #2 12 January 1863-1 August 1865
XVI Corps Gulf 18 February 1865-20 July 1865
XVI Corps Tennessee 18 December 1862-7 November 1864
Detachment Army of the Tennessee (XVI Corps) 7 November 1864-18 February 1865
Left Wing XVI Corps Tennessee 22 December 1862-7 November 1864
Right Wing XVI Corps Tennessee 7 March 1864-7 November 1864
XVII Corps Tennessee 18 December 1862-1 August 1865
XVIII Corps James 2 May 1864-3 December 1864
XVIII Corps North Carolina #1 24 December 1862-15 July 1863
XVIII Corps North Carolina #2 16 August 1863-25 April 1864
XVIII Corps Virginia and North Carolina #1 15 July 1863-16 August 1863
XVIII Corps Virginia and North Carolina #2 25 April 1864-2 May 1864
XIX Corps Gulf 16 December 1862-7 November 1864
XIX Corps Shenandoah 7 November 1864-20 March 1865
XX Corps Cumberland #1 9 January 1863-9 October 1863
XX Corps Cumberland #2 14 April 1864—7 November 1864
XX Corps Georgia 7 November 1864-1 June 1865
XXI Corps Cumberland 9 January 1863-9 October 1863
XXII Corps Washington 2 February 1863-26 June 1865
XXIII Corps North Carolina 2 February 1865-1 August 1865
XXIII Corps Ohio 28 May 1863-2 February 1865
XXIV Corps James 3 December 1864-1 August 1865
XXV Corps James 3 December 1864-23 May 1865
XXV Corps Southwest 23 May 1865-4 June 1865
Cavalry Corps Cumberland 24 October 1862—29 October 1864
Cavalry Corps Mississippi 29 October 1864-17 April 1865
Cavalry Corps Ohio 30 November 1863-10 April 1864
Cavalry Corps Potomac 12 February 1863-27 June 1865
Cavalry Corps Shenandoah 7 August 1864-25 March 1865
Reserve Corps Cumberland 8 June 1863-9 October 1863
Reserve Corps Gulf 11 June 1864-17 January 1865
Terry’s Provisional Corps North Carolina 31 January 1865-23 March 1865
Terry’s Provisional Corps Virginia 18 January 1865-31 January 1865
Terry’s Provisional Corps Virginia and North Carolina 6 January 1865-18 January 1865
Chronological List (by order of establishment)
I Corps Potomac #1
3 March 1862-4 April 1862
Irvin McDowell 3 March 1862-4 April 1862
3 March 1862: I 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.
II Corps Potomac
3 March 1862-28 June 1865
Edwin Vose Sumner 3 March 1862-6 October 1862
Darius Nash Couch 7 October 1862-25 December 1862
John Sedgwick 26 December 1862-25 January 1863
Oliver Otis Howard temporary 26 January 1863-2 February 1863
Darius Nash Couch 3 February 1863-22 May 1863
Winfield Scott Hancock 22 May 1863-1 July 1863
John Gibbon temporary 1 July 1863-2 July 1863
Winfield Scott Hancock 2 July 1863-3 July 1863
William Hays temporary 3 July 1863-16 August 1863
Gouverneur Kemble Warren 16 August 1863-26 August 1863
John Curtis Caldwell temporary 26 August 1863-2 September 1863
Gouverneur Kemble Warren 2 September 1863-10 October 1863
John Curtis Caldwell temporary 10 October 1863-12 October 1863
Gouverneur Kemble Warren 12 October 1863-16 December 1863
John Curtis Caldwell temporary 16 December 1863-29 December 1863
Gouverneur Kemble Warren 29 December 1863-9 January 1864
John Curtis Caldwell temporary 9 January 1864-13 January 1864
Gouverneur Kemble Warren 13 January 1864-24 March 1864
Winfield Scott Hancock 24 March 1864-18 June 1864
David Bell Birney temporary 18 June 1864-27 June 1864
Winfield Scott Hancock 27 June 1864-26 November 1864
Andrew Atkinson Humphreys 26 November 1864-15 February 1865
Gershom Mott temporary 15 February 1865-17 February 1865
Nelson Appleton Miles temporary 17 February 1865-25 February 1865
Andrew Atkinson Humphreys 25 February 1865-19 April 1865
Francis Channing Barlow temporary 19 April 1865-5 May 1865
Andrew Atkinson Humphreys 5 May 1865-9 June 1865
Gershom Mott temporary 9 June 1865-20 June 1865
Andrew Atkinson Humphreys 20 June 1865-28 June 1865
3 March 1862: II Corps Potomac was established in the Army of the Potomac.
14 November 1862: II Corps Potomac transferred to the Right Grand Division of the Army of the Potomac.
5 February 1863: II Corps Potomac transferred from the Right Grand Division of the Army of the Potomac to the Army of the Potomac.
24 March 1864: III Corps Potomac was discontinued, and its forces were allocated to II Corps Potomac and VI Corps Potomac.
28 June 1865: II Corps Potomac was discontinued.
III Corps Potomac
3 March 1862-24 March 1864
Samuel Peter Heintzelman 3 March 1862-19 October 1862
George Stoneman 20 October 1862-5 February 1863
Daniel Edgar Sickles 5 February 1863-29 May 1863
David Bell Birney temporary 29 May 1863-3 June 1863
Daniel Edgar Sickles 3 June 1863-2 July 1863
David Bell Birney temporary 2 July 1863-7 July 1863
William Henry French 7 July 1863-28 January 1864
David Bell Birney temporary 28 January 1864-17 February 1864
William Henry French 17 February 1864-24 March 1864
3 March 1862: III Corps Potomac was established in the Army of the Potomac.
14 November 1862: III Corps Potomac transferred to the Centre Grand Division of the Army of the Potomac.
5 February 1863: III Corps Potomac transferred from the Centre Grand Division Potomac to the Army of the Potomac.
24 March 1864: III Corps Potomac was discontinued, and its forces were allocated to II Corps Potomac and VI Corps Potomac.
IV Corps Potomac
3 March 1862-16 August 1862
Erasmus Darwin Keyes 3 March 1862-16 August 1862
3 March 1862: IV Corps Potomac was established in the Army of the Potomac.
16 August 1862: IV Corps Potomac transferred from the Army of the Potomac to the Department of Virginia.
V Corps Potomac #1
3 March 1862-4 April 1862
Nathaniel Prentiss Banks 3 March 1862-4 April 1862
3 March 1862: V Corps Potomac was established in the Army of the Potomac.
4 April 1862: V Corps Potomac was discontinued, and its forces were incorporated into the Department of the Shenandoah.
V Corps Potomac #2
18 May 1862-28 June 1865
Fitz-John Porter 18 May 1862-9 November 1862
Joseph Hooker 10 November 1862-15 November 1862
Daniel Butterfield 16 November 1862-23 December 1862
George Gordon Meade 24 December 1862-25 January 1863
Charles Griffin temporary 26 January 1863-31 January 1863
George Sykes 1 February 1863-5 February 1863
George Gordon Meade 5 February 1863-16 February 1863
George Sykes temporary 16 February 1863-23 February 1863
Andrew Atkinson Humphreys temporary 23 February 1863-28 February 1863
George Gordon Meade 28 February 1863-28 June 1863
George Sykes 28 June 1863-7 October 1863
Samuel Wylie Crawford temporary 7 October 1863-15 October 1863
George Sykes 15 October 1863-24 March 1864
Gouverneur Kemble Warren 24 March 1864-2 January 1865
Samuel Wylie Crawford temporary 2 January 1865-27 January 1865
Gouverneur Kemble Warren 27 January 1865-1 April 1865
Charles Griffin temporary 1 April 1865-19 April 1865, 19 April 1865-28 June 1865
18 May 1862: Provisional V Corps Potomac was established in the Army of the Potomac.
22 July 1862: V Provisional Corps Potomac was confirmed as V Corps Potomac.
14 November 1862: V Corps Potomac transferred to the Centre Grand Division of the Army of the Potomac.
5 February 1863: V Corps Potomac transferred from the Centre Grand Division Potomac to the Army of the Potomac.
24 March 1864: I Corps Potomac was discontinued, and its forces were allocated to V Corps Potomac.
28 June 1865: V Corps Potomac was discontinued.
VI Corps Potomac #1
18 May 1862-7 August 1864
William Buel Franklin 18 May 1862-15 November 1862
William Farrar Smith 16 November 1862-24 January 1863
John Newton 2 January 1863-3 February 1863
John Sedgwick 4 February 1863-6 April 1864
James Brewerton Ricketts temporary 6 April 1864-13 April 1864
John Sedgwick 13 April 1864-9 May 1864
Horatio Gouverneur Wright 9 May 1864-7 August 1864
18 May 1862: Provisional VI Corps Potomac was established in the Army of the Potomac.
22 July 1862: VI Provisional Corps Potomac was confirmed as VI Corps Potomac.
14 November 1862: VI Corps Potomac transferred to the Left Grand Division of the Army of the Potomac.
5 February 1863: VI Corps Potomac transferred from Left Grand Division Potomac to the Army of the Potomac.
24 March 1864: III Corps Potomac was discontinued, and its forces were allocated to II Corps Potomac and VI Corps Potomac.
7 August 1864: VI Corps Potomac transferred from the Army of the Potomac to the Army of the Shenandoah.
I Corps Virginia
26 June 1862 12 September 1862
John Charles Frémont 26 June 1862-28 June 1862
Robert Cumming Schenck temporary 28 June 1862-29 June 1862
Franz Sigel 29 June 1862-7 July 1862
Robert Cumming Schenck temporary 7 July 1862-12 July 1862
Franz Sigel 12 July 1862-12 September 1862
26 June 1862: I Corps Virginia was established, comprising the field forces formerly in the Mountain Department.
12 September 1862: I Corps Virginia was discontinued, and incorporated into XI Corps Potomac.
II Corps Virginia
26 June 1862 12 September 1862
Nathaniel Prentiss Banks 26 June 1862-3 September 1862
Alpheus Starkey Williams temporary 4 September 1862-12 September 1862
26 June 1862: II Corps Virginia was established, comprising the field forces formerly in the Department of the Shenandoah.
12 September 1862: II Corps Virginia was discontinued, and incorporated into XII Corps Potomac.
III Corps Virginia
26 June 1862-12 September 1862
Irvin McDowell 26 June 1862-4 September 1862
James Brewerton Ricketts temporary 5 September 1862
Joseph Hooker 6 September 1862-12 September 1862
26 June 1862: III Corps Virginia was established., comprising the field forces formerly in the Department of the Rappahannock.
12 September 1862: III Corps Virginia was discontinued, and incorporated into I Corps Potomac.
VIII Corps Middle
12 July 1862-27 June 1865
John Ellis Wool 12 July 1862-22 December 1862
Robert Cumming Schenck 22 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 Morris temporary 22 September 1863-28 September 1863
Erastus Barnard Tyler temporary 28 September 1863-10 October 1863
Robert Cumming Schenck 10 October 1863-5 December 1863
Henry Hayes Lockwood 5 December 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
12 July 1862: VIII Corps Middle was established in the Middle Department.
17 May 1865: VIII Corps Middle transferred from the Middle Department to the direct command of the Middle Military Division.
27 June 1865: VIII Corps Middle transferred from the Middle Military Division to the Military Division of the Atlantic.
IX Corps Potomac #1
22 July 1862-3 August 1862
Ambrose Everett Burnside 22 July 1862-3 August 1862
22 July 1862: IX Corps Potomac was established in the Army of the Potomac, comprising forces that had participated in the Expedition to North Carolina.
3 August 1862: IX Corps transferred from the Army of the Potomac to the Department of Virginia.
IX Corps Virginia #1
3 August 1862-3 September 1862
Ambrose Everett Burnside 3 August 1862-3 September 1862
3 August 1862: IX Corps 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.
IV Corps Virginia
16 August 1862-15 July 1863
Erasmus Darwin Keyes 16 August 1862-15 July 1863
16 August 1862: IV Corps Potomac transferred from the Army of the Potomac to the Department of Virginia.
15 July 1863: IV Corps Virginia transferred from the Department of Virginia to the Department of Virginia and North Carolina.
IX Corps Potomac #2
3 September 1862-5 February 1863
Jesse Lee Reno 3 September 1862-13 September 1862
Jacob Dolson Cox temporary 14 September 1862-7 October 1862
Orlando Bolivar Willcox 8 October 1862-16 January 1863
John Sedgwick 16 January 1863-5 February 1863
3 September 1862: IX Corps Virginia transferred from the Department of Virginia to the Army of the Potomac.
14 November 1862: IX Corps Potomac transferred to the Right Grand Division of the Army of the Potomac.
5 February 1863: IX Corps Potomac transferred from the Right Grand Division of the Army of the Potomac to the Department of Virginia.
X Corps South
3 September 1862-28 April 1864
John Milton Brannan 3 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 1863-11 June 1863
Quincy Adams Gillmore 12 June 1863-28 April 1864
3 September 1862: X Corps South was established in the Department of the South.
28 April 1864: X Corps South transferred from the Department of the South to the Army of the James.
I Corps Potomac #2
12 September 1862-24 March 1864
Joseph Hooker 12 September 1862-17 September 1862,
George Gordon Meade temporary 17 September 1862-28 September 1862
John Fulton Reynolds 29 September 1862-1 January 1863
James Samuel Wadsworth temporary 2 January 1863-3 January 1863
John Fulton Reynolds 4 January 1863-28 February 1863
James Samuel Wadsworth temporary 1 March 1863-8 March 1863
John Fulton Reynolds 9 March 1863-1 July 1863
Abner Doubleday 1 July 1863-2 July 1863
John Newton 2 July 1863-10 March 1864
James Samuel Wadsworth temporary 11 March 1864-14 March 1864
John Newton 14 March 186-24 March 1864
12 September 1862: I Corps Potomac was re-established, comprising the forces of the discontinued III Corps Army of Virginia.
14 November 1862: I Corps Potomac transferred to the Left Grand Division of the Army of the Potomac.
5 February 1863: I Corps Potomac transferred from the Left Grand Division Potomac to the Army of the Potomac.
24 March 1864: I Corps Potomac was discontinued, and its forces were allocated to V Corps Potomac.
XI Corps Potomac
12 September 1862-25 September 1863
Franz Sigel 12 September 1862-9 January 1863
Julius Stahel temporary 10 January 1863-18 January 1863
Carl Schurz temporary 19 January 1863-5 February 1863
Franz Sigel 5 February 1863-22 February 1863
Adolph Wilhelm August Frederick von Steinwehr temporary 22 February 1863-5 March 1863
Carl Schurz temporary 5 March 1863-2 April 1863
Oliver Otis Howard 2 April 1863-1 July 1863
Carl Schurz temporary 1 July 1863
Oliver Otis Howard 1 July 1863-25 September 1863
12 September 1862: XI Corps was established in the Army of the Potomac, comprising the forces of the discontinued I Corps Virginia.
14 November 1862: XI Corps Potomac transferred to the Reserve Grand Division of the Army of the Potomac.
5 February 1863: XI Corps Potomac transferred from the Reserve Grand Division of the Army of the Potomac to 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
12 September 1862-25 September 1863
Alpheus Starkey Williams temporary 4 September 1862-12 September 1862
Joseph King Fenno Mansfield 15 September 1862-17 September 1862
Alpheus Starkey Williams temporary 17 September 1862-19 October 1862
Henry Warner Slocum 20 October 1862-1 July 1863
Alpheus Starkey Williams temporary 1 July 1863-4 July 1863
Henry Warner Slocum 4 July 1863-31 August 1863
Alpheus Starkey Williams temporary 31 August 1863-13 September 1863
Henry Warner Slocum 13 September 1863-25 September 1863
12 September 1862: XII Corps was established in the Army of the Potomac, comprising the forces of the discontinued II Corps Virginia.
14 November 1862: XII Corps Potomac transferred to the Reserve Grand Division of the Army of the Potomac.
5 February 1863: XII Corps Potomac transferred from the Reserve Grand Division of the Army of the Potomac to the Army of the Potomac.
25 September 1863: XII Corps Potomac transferred from the Army of the Potomac to Hooker’s Command Cumberland.
I Corps Ohio
29 September 1862-24 October 1862
Alexander McDowell McCook 29 September 1862-24 October 1862
29 September 1862: I Corps Ohio was established in the Army of the Ohio.
24 October 1862: I Corps Ohio was discontinued, and its forces transferred to the Army of the Cumberland and renamed I Corps Cumberland.
II Corps Ohio
29 September 1862-24 October 1862
Thomas Leonidas Crittenden 29 September 1862-24 October 1862
29 September 1862: II Corps Ohio was established in the Army of the Ohio.
24 October 1862: II Corps Ohio was discontinued, and its forces transferred to the Army of the Cumberland and renamed II Corps Cumberland.
III Corps Ohio
29 September 1862-24 October 1862
Charles Champion Gilbert 29 September 1862-10 October 1862
Gordon Granger 10 October 1862-24 October 1862
29 September 1862: III Corps Ohio was established in the Army of the Ohio from the “Army of Kentucky”.
24 October 1862: III Corps Ohio was discontinued, and its forces transferred to the Army of the Cumberland as III Corps Cumberland.
I Corps Cumberland
24 October 1862-5 November 1862
Alexander McDowell McCook 24 October 1862-5 November 1862
24 October 1862: I Corps Cumberland was established in the Army of the Cumberland incorporating the former I Corps Ohio.
5 November 1862: I Corps Cumberland was formally discontinued, and renamed Right Wing XIV Corps Cumberland.
II Corps Cumberland
24 October 1862-5 November 1862
Thomas Leonidas Crittenden 24 October 1862-5 November 1862
24 October 1862: II Corps Cumberland was established in the Army of the Cumberland incorporating the former II Corps Ohio.
5 November 1862: II Corps Cumberland was formally discontinued, and renamed Left Wing XIV Corps Cumberland.
III Corps Cumberland
24 October 1862-5 November 1862
Charles Champion Gilbert 24 October 1862-5 November 1862
24 October 1862: III Corps Cumberland was established from the renamed III Corps Ohio.
5 November 1862: III Corps Cumberland was discontinued and renamed Centre XIV Corps Cumberland.
XIII Corps Tennessee #1
24 October 1862-4 January 1863
Ulysses Simpson Grant 24 October 1862-18 December 1862 interim 22 December 1862
John Alexander McClernand 18 December 1862-4 January 1863
24 October 1862: XIII Corps was established in the Army of the 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. Centre XIII Corps Tennessee was established 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.
22 December 1862: The unofficial “I Corps Mississippi” was established in the “Army of the Mississippi” from forces in XIII Corps Tennessee. 4 January 1863: XIII Corps Tennessee was temporarily discontinued, and renamed unofficially as “I Corps Mississippi”.
XIV Corps Cumberland
24 October 1862-7 November 1864
William Starke Rosecrans 24 October 1862-9 January 1863
George Henry Thomas 9 January 1863-28 October 1863
John McAuley Palmer 28 October 1863-7 August 1864
Richard W Johnson temporary 7 August 1864-24 August 1864
Jefferson Columbus Davis 24 August 1864-7 November 1864
24 October 1862: XIV Corps was established in the Army of the Cumberland, comprising the field forces of the former Army of the Ohio. XIV Corps continued to be referred to unofficially as the Army of the Ohio.
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. Right Wing XIV Corps Cumberland was established in XIV Corps Cumberland. Left Wing XIV Corps Cumberland was established in XIV Corps Cumberland. Centre XIV Corps Cumberland was established in XIV Corps Cumberland.
9 January 1863: Centre XIV Corps Cumberland was discontinued, and renamed XIV Corps Cumberland.
7 November 1864: XIV Corps Cumberland transferred from the Army of the Cumberland to the “Army of Georgia”.
Cavalry Corps Cumberland
24 October 1862-29 October 1864
John Kennett 24 October 1862-24 November 1862
David Sloane Stanley 24 November 1862-9 September 1863
Robert Byington Mitchell temporary 9 September 1863-9 November 1863
David Sloane Stanley 9 November 1863-20 November 1863
Washington Lafayette Elliott 20 November 1863-19 August 1864
Richard W Johnson temporary 19 August 1864-9 September 1864
Washington Lafayette Elliott 9 September 1864-29 October 1864
24 October 1862: Cavalry Corps Cumberland was established in the Army of the Cumberland.
29 October 1864: Cavalry Corps Cumberland was discontinued, and renamed as Cavalry Corps Military Division of the Mississippi.
Left Wing XIII Corps Tennessee
1 November 1862-22 December 1862
Charles Smith Hamilton 1 November 1862-22 December 1862
1 November 1862: Left Wing XIII Corps Tennessee was established in the Army of the Tennessee.
22 December 1862: Left Wing XIII Corps Tennessee was discontinued, and incorporated into XVI Corps Tennessee and Left Wing XVI Corps Tennessee.
Right Wing XIII Corps Tennessee
1 November 1862-22 December 1862
James Birdseye McPherson 1 November 1862-27 November 1862
William Tecumseh Sherman 27 November 1862-22 December 1862
1 November 1862: Right Wing XIII Corps Tennessee was established in the Army of the Tennessee.
22 December 1862: Right Wing XIII Corps Tennessee was discontinued, and incorporated into XV Corps Tennessee.
Centre XIV Corps Cumberland
5 November 1862-9 January 1863
George Henry Thomas 5 November 1862-9 January 1863
5 November 1862: Centre XIV Corps Cumberland was established in the Army of the Cumberland incorporating the former III Corps Cumberland.
9 January 1863: Centre XIV Corps Cumberland was discontinued, and incorporated into XIV Corps Cumberland.
Left Wing XIV Corps Cumberland
5 November 1862-9 January 1863
Thomas Leonidas Crittenden 5 November 1862-9 January 1863
5 November 1862: Left Wing XIV Corps Cumberland was established in the Army of the Cumberland incorporating the former II Corps Cumberland.
9 January 1863: Left Wing XIV Corps Cumberland was discontinued, and renamed XXI Corps Cumberland.
Right Wing XIV Corps Cumberland
5 November 1862-9 January 1863
Alexander McDowell McCook 5 November 1862-9 January 1863
5 November 1862: Right Wing XIV Corps Cumberland was established in the Army of the Cumberland incorporating the former I Corps Cumberland.
9 January 1863: Right Wing XIV Corps Cumberland was discontinued, and renamed XX Corps Cumberland.
Centre Grand Division, Potomac
14 November 1862-5 February 1863
Joseph Hooker 14 November 1862-24 January 1863
George Gordon Meade 25 January 1863
14 November 1862: The Centre Grand Division was established in the Army of the Potomac. III Corps Potomac transferred to the Centre Grand Division of the Army of the Potomac. V Corps Potomac transferred to the Centre Grand Division of the Army of the Potomac.
5 February 1863: III Corps Potomac transferred to the Army of the Potomac. V Corps Potomac transferred to the Army of the Potomac. The Centre Grand Division of the Army of the Potomac was discontinued.
Left Grand Division, Potomac
14 November 1862-5 February 1863
William Buel Franklin 14 November 1862-24 January 1863
William Farrar Smith 25 January 1863-5 February 1863
14 November 1862: The Left Grand Division was established in the Army of the Potomac. I Corps Potomac transferred to the Left Grand Division of the Army of the Potomac. VI Corps Potomac transferred to the Left Grand Division of the Army of the Potomac.
5 February 1863: I Corps Potomac transferred to the Army of the Potomac. VI Corps Potomac transferred to the Army of the Potomac. The Left Grand Division of the Army of the Potomac was discontinued.
Reserve Grand Division, Potomac
14 November 1862-5 February 1863
Franz Sigel 14 November 1862-5 February 1863
14 November 1862: The Reserve Grand Division was established in the Army of the Potomac. XI Corps Potomac transferred to the Reserve Grand Division of the Army of the Potomac. XII Corps Potomac transferred to the Reserve Grand Division of the Army of the Potomac.
5 February 1863: XI Corps Potomac transferred to the Army of the Potomac. XII Corps Potomac transferred to the Army of the Potomac. The Reserve Grand Division of the Army of the Potomac was discontinued.
Right Grand Division. Potomac
14 November 1862-5 February 1863
Edwin Vose Sumner 14 November 1862-24 January 1863
Darius Nash Couch 25 January 1863-5 February 1863
14 November 1862: The Right Grand Division was established in the Army of the Potomac. II Corps Potomac transferred to the Right Grand Division of the Army of the Potomac. IX Corps Potomac transferred to the Right Grand Division of the Army of the Potomac.
5 February 1863: II Corps Potomac transferred to the Army of the Potomac. IX Corps Potomac transferred to the Department of Virginia. The Right Grand Division of the Army of the Potomac was discontinued.
Centre XIII Corps Tennessee
27 November 1862-22 December 1862
James Birdseye McPherson 27 November 1862-22 December 1862
27 November 1862: Centre XIII Corps Tennessee was established in the Army of the Tennessee.
22 December 1862: Centre XIII Corps Tennessee was discontinued, and incorporated into XVII Corps Tennessee.
XIX Corps Gulf
16 December 1862-7 November 1864
Nathaniel Prentiss Banks 16 December 1862-19 August 1863
William Buel Franklin 20 August 1863-1 May 1864
William Hemsley Emory 2 May 1864-7 May 1864
Michael Kelly Lawler 7 May 1864-8 May 1864
William Plummer Benton 9 May 1864-1 July 1864
Benjamin Stone Roberts temporary 2 July 1864-5 July 1864
Michael Kelly Lawler temporary 6 July 1864
Joseph Jones Reynolds 7 July 1864-7 November 1864
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 retroactively from 16 December 1862.
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.
XV Corps Tennessee #1
18 December 1862-4 January 1863
William Tecumseh Sherman 18 December 1862-4 January 1863
18 December 1862: XV Corps Tennessee was designated for the forces taking part in the Yazoo Expedition.
22 December 1862: XV Corps Tennessee was established in the Army of the Tennessee, comprising the former Right Wing XIII Corps Tennessee.
4 January 1863: XV Corps Tennessee was discontinued and renamed unofficially as “II Corps Mississippi”.
XVI Corps Tennessee
18 December 1862-7 November 1864
Stephen Augustus Hurlbut 18 December 1862-10 January 1863
Charles Smith Hamilton temporary 10 January 1863-5 February 1863
Stephen Augustus Hurlbut 5 February 1863-15 October 1863
Napoleon Jackson Tecumseh Dana 15 October 1863-16 April 1864
Vacant 17 April 1864-14 October 1864
Napoleon Jackson Tecumseh Dana 15 October 1864-7 November 1864
18 December 1862: XVI Corps Tennessee was designated in the Army of the Tennessee.
22 December 1862: XVI Corps Tennessee was formally established in the Army of the Tennessee.
20 January 1863: XVI Corps Tennessee was reorganised as an administrative organisation supervising forces in transit and those dispersed around Memphis, La Grange, and Corinth.
7 March 1864: Right Wing XVI Corps Tennessee was established in the Army of the Tennessee.
17 April 1864: Left Wing XVI Corps Tennessee continued to operate autonomously without Corps command. Right Wing XVI Corps Tennessee continued to operate autonomously without Corps command.
7 November 1864: Right Wing XVI Corps Tennessee was discontinued and renamed Detachment Army of the Tennessee XVI Corps, and unofficially as XVI Corps Tennessee. Left Wing XVI Corps Tennessee was discontinued. XVI Corps Tennessee was discontinued.
XVII Corps Tennessee
18 December 1862-1 August 1865
James Birdseye McPherson 18 December 1862-23 April 1864
Francis Preston Blair temporary 23 April 1864-3 May 1864, 4 May 1864-22 September 1864
Thomas Edward Greenfield Ransom 22 September 1864-10 October 1864
Mortimer Dormer Leggett temporary 10 October 1864-24 October 1864
Joseph Anthony Mower 24 October 1864-31 October 1864
Francis Preston Blair 31 October 1864-8 May 1865
Mortimer Dormer Leggett temporary 8 May 1865-9 May 1865
Francis Preston Blair 9 May 1865-24 June 1865
Mortimer Dormer Leggett temporary 24 June 1865-1 July 1865
Francis Preston Blair 1 July 1865-19 July 1865
William Worth Belknap 19 July 1865-1 August 1865
18 December 1862: XVII Corps Tennessee was designated in the Army of the Tennessee from the former Centre XIII Corps Tennessee.
22 December 1862: XVII Corps Tennessee was formally established in the Army of the Tennessee.
1 August 1865: XVII Corps Tennessee was discontinued.
Left Wing XVI Corps Tennessee
22 December 1862-7 November 1864
Charles Smith Hamilton 22 December 1862-1 April 1863
Vacant 1 April 1863-6 July 1863
Grenville Mellen Dodge 7 July 1863
August Mersy 7 August 1863-3 September 1863
Eugene Asa Carr 3 September 1863-15 September 1863
Grenville Mellen Dodge 15 September 1863-19 August 1864
Thomas Edward Greenfield Ransom 19 August 1864-15 October 1864
Grenville Mellen Dodge 15 October 1864-7 November 1864
22 December 1862: Left Wing XVI Corps Tennessee was established in the Army of the Tennessee.
7 November 1864: Left Wing XVI Corps Tennessee was discontinued.
XVIII Corps North Carolina #1
24 December 1862-15 July 1863
John Gray Foster 24 December 1862-15 July 1863
24 December 1862: XVIII Corps North Carolina was established in the Department of North Carolina, comprising forces that had taken part in the expeditions to Roanoke Island and New Bern and the garrisons of New Bern, Plymouth, and Beaufort.
15 July 1863: XVIII Corps North Carolina transferred from the Department of North Carolina to the Department of Virginia and North Carolina.
I Corps Mississippi
4 January 1863 to 12 January 1863
George Washington Morgan 4 January 1863-12 January 1863
4 January 1863: The unofficial “I Corps Mississippi” was established in the “Army of the Mississippi” incorporating XIII Corps Tennessee.
12 January 1863: The unofficial “I Corps Mississippi” was discontinued, and renamed XIII Corps Tennessee.
II Corps Mississippi
4 January 1863 to 12 January 1863
William Tecumseh Sherman 4 January 1863-12 January 1863
4 January 1863: The unofficial “II Corps Mississippi” was established in the Army “of the Mississippi” incorporating XV Corps Tennessee.
12 January 1863: “II Corps Mississippi” was discontinued, and renamed XV Corps Tennessee.
XX Corps Cumberland #1
9 January 1863-9 October 1863
Alexander McDowell McCook 9 January-9 October 1863
9 January 1863: XX Corps Cumberland was established in the Army of the Cumberland, comprising forces from Right Wing XIV Corps Cumberland.
9 October 1863: XX Corps Cumberland was discontinued and incorporated into IV Corps Cumberland.
XXI Corps Cumberland
9 January 1863-9 October 1863
Thomas Leonidas Crittenden 9 January 1863-19 February 1863
Thomas John Wood temporary 19 February 1863-19 March 1863
Thomas Leonidas Crittenden 19 March 1863-15 July 1863
John McAuley Palmer temporary 15 July 1863-17 August 1863
Thomas Leonidas Crittenden 17 August 1863-9 October 1863
9 January 1863: XXI Corps Cumberland was established in the Army of the Cumberland, comprising forces from Left Wing XIV Corps Cumberland.
9 October 1863: XXI Corps Cumberland was discontinued, and incorporated into IV Corps Cumberland.
XIII Corps Tennessee #2
12 January 1863-7 August 1863
George Washington Morgan 12 January 1863-31 January 1863
John Alexander McClernand 31 January 1863-19 June 1863
Edward Otho Cresap Ord 19 June 1863-28 July 1863
Cadwalader Colden Washburn 28 July 1863-7 August 1863
12 January 1863: XIII Corps Tennessee was established in the Army of the Tennessee, incorporating the unofficial “I Corps Mississippi”.
7 August 1863: XIII Corps Tennessee transferred from the Army of the Tennessee to the Department of the Gulf.
XV Corps Tennessee #2
12 January 1863-1 August 1865
William Tecumseh Sherman 12 January 1863-29 October 1863
Francis Preston Blair 29 October 1863-11 December 1863
John Alexander Logan 11 December 1863-22 July 1864
Morgan Lewis Smith temporary 22 July 1864-27 July 1864
John Alexander Logan 27 July 1864-2 September 1864
Peter Joseph Osterhaus 23 September 1864-8 January 1865
John Alexander Logan 8 January 1865-23 May 1865
William Babcock Hazen 23 May 1865-1 August 1865
12 January 1863: XV Corps Tennessee was re-established in the Army of the Tennessee from “II Corps Mississippi”.
1 August 1865: XV Corps Tennessee was discontinued.
XXII Corps Washington
2 February 1863-26 June 1865
Samuel Peter Heintzelman 2 February 1863-13 October 1863
Christopher Columbus Augur 13 October 1863-26 April 1865
John Grubb Parke 26 April 1865-26 June 1865
2 February 1863: XXII Corps Washington was established in the Department of Washington.
26 June 1865: XXII Corps Washington was discontinued.
IX Corps Virginia #2
5 February 1863-17 March 1863
William Farrar Smith 5 February 1863-7 March 1863
Orlando Bolivar Willcox temporary 8 March 1863-17 March 1863
5 February 1863: IX Corps Potomac transferred from the Right Grand Division of 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.
Cavalry Corps Potomac
12 February 1863-27 June 1865
George Stoneman 12 February 1863-22 May 1863
Alfred Pleasonton 22 May 1863-22 January 1864
David McMurtrie Gregg temporary 22 January 1864-12 February 1864
Alfred Pleasonton 12 February 1864-25 March 1864
David McMurtrie Gregg temporary 25 March 1864-4 April 1864
Philip Henry Sheridan 4 April 1864-2 August 1864
David McMurtrie Gregg 2 August 1864-10 February 1865
John Irvin Gregg temporary 10 February 1865-24 February 1865
Henry Eugene Davies 24 February 1865-25 March 1865
Wesley Merritt 25 March 1865-22 May 1865
George Crook 22 May 1865-1 June 1865
William Wells 1 June 1865-27 June 1865
12 February 1863: Cavalry Corps Potomac was established in the Army of the Potomac.
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 Potomac to the Army of the Potomac.
27 June 1865: Cavalry Corps Potomac was discontinued.
IX Corps Ohio #1
17 March 1863-5 June 1863
Ambrose Everett Burnside, 17 March 1863-20 March 1863
John Grubb Parke 20 March 1863-7 April 1863
Orlando Bolivar Willcox 6 April 1863-5 June 1863
17 March 1863: IX Corps Virginia transferred from the Department of Virginia to the Department of the Ohio.
11 April 1863: IX Corps Ohio transferred from the Department of the Ohio to the Army of the Ohio.
5 June 1863: IX Corps Ohio transferred from the Army of the Ohio to the Department of the Tennessee.
XXIII Corps Ohio
28 May 1863-2 February 1865
George Lucas Hartsuff 28 May 1863-24 September 1863
Mahlon Dickerson Manson 24 September 1863-2 December 1863
Jacob Dolson Cox 2 December 1863-10 February 1864
George Stoneman 10 February 1864-4 April 1864 interim 9 April 1864
John McAllister Schofield 4 April 1864-26 May 1864
Jacob Dolson Cox temporary 26 May 1864-28 May 1864
John McAllister Schofield 28 May 1864-14 September 1864
Jacob Dolson Cox temporary 14 September 1864-22 October 1864
John McAllister Schofield 22 October 1864-2 February 1865
28 May 1863: XXIII Corps Ohio was established in the Army of the Ohio from forces and garrisons in the Department of the Ohio. This force subsequently later became known unofficially as the “Army of the Ohio”.
2 February 1865: XXIII Corps Ohio transferred to the Department of North Carolina, retaining unofficially the title of the “Army of the Ohio”.
IX Corps Tennessee
5 June 1863-25 August 1863
John Grubb Parke 5 June 1863-25 August 1863
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.
Reserve Corps Cumberland
8 June 1863-9 October 1863
Gordon Granger 8 June 1863-9 October 1863
8 June 1863: Reserve Corps Cumberland was established in the Department of the Cumberland, incorporating the former Army of Kentucky.
9 October 1863: Reserve Corps Cumberland was discontinued, and incorporated into IV Corps Cumberland.
IV Corps Virginia and North Carolina
15 July 1863-1 August 1863
Erasmus Darwin Keyes 15 July 1863-1August 1863
15 July 1863: IV Corps Virginia transferred from the Department of Virginia to the Department of Virginia and North Carolina.
1 August 1863: IV Corps Virginia and North Carolina was discontinued, and its forces were assigned to XVIII Corps Virginia and North Carolina.
XVIII Corps Virginia and North Carolina #1
15 July 1863-16 August 1863
John Gray Foster 15 July 1863-18 July 1863
Innis Newton Palmer temporary 18 July 1863-13 August 1863
John James Peck 14 August 1863-16 August 1863
15 July 1863: XVIII Corps North Carolina transferred from the Department of North Carolina to the Department of Virginia and North Carolina.
1 August 1863: IV Corps Virginia and North Carolina was discontinued, and its forces were assigned to XVIII Corps Virginia and North Carolina.
16 August 1863: XVIII Corps Virginia and North Carolina transferred from the Department of Virginia and North Carolina to the Army of North Carolina.
XIII Corps Gulf #1
7 August 1863-7 May 1864
Cadwallader Colden Washburn 7 August 1863-14 September 1863
Edward Otho Cresap Ord 15 September 1863-18 October 1863
Cadwallader Colden Washburn 19 October 1863-24 October 1863
Napoleon Jackson Tecumseh Dana 25 October 1863
Cadwallader Colden Washburn temporary 26 October 1863-8 January 1864
Edward Otho Cresap Ord 9 January 1864-20 February 1864
John Alexander McClernand 20 February 1864-14 March 1864
Thomas Edward Greenfield Ransom 15 March 1864-7 April 1864
Robert Alexander Cameron 8 April 1864-26 April 1864
Michael Kelly Lawler 27 April 1864-9 May 1864
William Plummer Benton 9 May 1864-11 June 1864
7 August 1863: XIII Corps Tennessee transferred from the Army of the Tennessee to the Army of the Gulf.
11 June 1864: XIII Corps (Gulf) was discontinued, and most of its forces were assigned later to form Reserve Corps (Gulf).
XVIII Corps North Carolina #2
16 August 1863-25 April 1864
John Gray Foster 16 August 1863-10 November 1863
Benjamin Franklin Butler 11 November 1863-25 April 1864
16 August 1863: XVIII Corps Virginia and North Carolina transferred from the Department of Virginia and North Carolina to the Army of North Carolina.
25 April 1864: XVIII Corps North Carolina transferred from the discontinued Army of North Carolina to the Department of Virginia and North Carolina.
IX Corps Ohio #2
25 August 1863-13 April 1864
Robert Brown Potter temporary 25 August 1863-15 September 1863
John Grubb Parke temporary 15 September 1863-17 September 1863
Ambrose Everett Burnside 17 September 1863-17 January 1864
Orlando Bolivar Willcox temporary 17 January 1864-26 January 1864
John Grubb Parke 26 January 1864-16 March 1864
Orlando Bolivar Willcox temporary 16 March 1864-19 March 1864
John Grubb Parke 19 March 1864-13 April 1864
25 August 1863: IX Corps Tennessee transferred from the Department of the Tennessee to the Army of the Ohio.
13 April 1864: IX Corps Ohio transferred from the Army of the Ohio to the Department of the Potomac.
Hooker’s Command Cumberland
25 September 1863-14 April 1864
Joseph Hooker 25 September 1863-14 April 1864
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.
14 April 1864: Hooker’s Command Cumberland was discontinued, and its forces were incorporated into XX Corps Cumberland.
XI Corps Cumberland (Hooker’s Command)
25 September 1863-16 14 April 1864
Oliver Otis Howard 25 September 1863-21 January 1864
Carl Schurz temporary 21 January 1864-25 February 1864
Oliver Otis Howard 25 February 1864-14 April 1864
25 September 1863: XI Corps Potomac transferred from the Army of the Potomac to Hooker’s Command Cumberland.
14 April 1864: XI Corps Cumberland was discontinued, and its forces were incorporated into XX Corps Cumberland.
XII Corps Cumberland (Hooker’s Command)
25 September 1863-16 October 1863
Henry Warner Slocum 25 September 1863-14 April 1864
25 September 1863: XII Corps Potomac transferred from the Army of the Potomac to Hooker’s Command Cumberland.
14 April 1864: XII Corps Cumberland was discontinued, and its forces were incorporated into XX Corps Cumberland.
IV Corps Cumberland
28 September 1863-1 April 1865
Gordon Granger 28 September 1863-10 April 1864
Oliver Otis Howard 10 April 1864-27 July 1864
David Sloane Stanley 27 July 1864-1 December 1864
Thomas John Wood temporary 1 December 1864-31 January 1865
David Sloane Stanley 31 January 1865-1 April 1865
28 September 1863: IV Corps Cumberland was established in the Army of the Cumberland by consolidating the former XX Corps Cumberland and XXI Corps 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. Reserve Corps Cumberland was discontinued, and incorporated into IV Corps Cumberland.
1 April 1865: IV Corps Cumberland was discontinued.
Cavalry Corps Ohio
30 November 1863-10 April 1864
James Murrell Shackelford 30 November 1863-15 December 1863
Samuel Davis Sturgis 15 December 1863-10 April 1864
30 November 1863: Cavalry Corps Ohio was established in the Army of the Ohio.
10 April 1864: Cavalry Corps Ohio was discontinued.
VII Corps 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: VII Corps Arkansas was established in the Army of Arkansas.
1 August 1865: VII Corps Arkansas was discontinued.
Right Wing XVI Corps Tennessee
7 March 1864-7 November 1864
Andrew Jackson Smith 7 March 1864-7 November 1864
7 March 1864: Right Wing XVI Corps Tennessee was established in the Army of the Tennessee.
7 November 1864: Right Wing XVI Corps Tennessee was discontinued, and renamed Detachment Army of the Tennessee XVI Corps.
IX Corps Potomac #3
13 April 1864-24 April 1865
Ambrose Everett Burnside 13 April 1864-14 August 1864
John Grubb Parke temporary 14 August 1864-22 August 1864, 22 August 1864-1 September 1864
Orlando Bolivar Willcox temporary 1 September 1864-9 September 1864
John Grubb Parke 9 September 1864-31 December 1864
Orlando Bolivar Willcox temporary 31 December 1864-12 January 1865
John Grubb Parke 12 January 1865-24 January 1865
Orlando Bolivar Willcox temporary 24 January 1865-2 February 1865
John Grubb Parke 2 February 1865-24 April 1865
13 April 1864: IX Corps transferred from the Army of the Ohio to the Department of the Potomac.
24 May 1864: IX Corps transferred from the Department of the Potomac to the Army of the Potomac.
24 April 1865: IX Corps Potomac transferred from the Army of the Potomac to the Department of Washington.
XX Corps Cumberland #2
14 April 1864-7 November 1864
Joseph Hooker 14 April 1864-28 July 1864
Alpheus Starkey Williams interim 28 July 1864-28 August 1864
Henry Warner Slocum 28 August 1864-7 November 1864
14 April 1864: XX Corps Cumberland was established in the Army of the Cumberland. XI Corps Cumberland was discontinued, and its forces were incorporated into XX Corps Cumberland. XII Corps Cumberland was discontinued, and its forces were incorporated into XX Corps Cumberland.
7 November 1864: XX Corps Cumberland transferred from the Army of the Cumberland to the “Army of Georgia”.
XVIII Corps Virginia and North Carolina #2
25 April 1864-2 May 1864
Benjamin Franklin Butler 25 April 1864-2 May 1864
25 April 1864: XVIII Corps North Carolina transferred from the discontinued Army of North Carolina to the Department of Virginia and North Carolina.
2 May 1864: XVIII Corps transferred from the Department of Virginia and North Carolina to the Army of the James.
X Corps James
28 April 1864-3 December 1864
Alfred Howe Terry temporary 28 April 1864-3 May 1864
Quincy Adam Gillmore 4 May 1864-13 June 1864
Alfred Howe Terry temporary 14 June 1864-20 June 1864
William Thomas Harbaugh Brooks temporary 21 June 1864-13 July 1864
Alfred Howe Terry temporary 14 July 1864-20 July 1864
Edward Otho Cresap Ord 21 July 1864-22 July 1864
David Bell Birney 23 July 1864-9 October 1864
Alfred Howe Terry 10 October 1864-3 November 1864
Adelbert Ames temporary 4 November 1864-17 November 1864
Alfred Howe Terry 18 November 1864-3 December 1864
28 April 1864: X Corps South transferred from the Department of the South to 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 James and XVIII Corps James. X Corps James was discontinued.
XVIII Corps James
2 May 1864-3 December 1864
William Farrar Smith 2 May 1864-9 July 1864
John Henry Martindale temporary 10 July 1864-20 July 1864
Edward Otho Cresap Ord 21 July 1864-3 September 1864
John Gibbon temporary 4 September 1864-21 September 1864
Edward Otho Cresap Ord 22 September 1864-28 September 1864
Charles Adam Heckman temporary 29 September 1864-30 September 1864
Godfrey Weitzel 1 October 1864-3 December 1864
2 May 1864: XVIII Corps transferred from the Department of Virginia and North Carolina to 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. XVIII Corps James was discontinued.
Reserve Corps Gulf
11 June 1864-17 January 1865
Gordon Granger 11 June 1864-17 January 1865
11 June 1864: Reserve Corps Gulf was established in the Department of the Gulf.
17 January 1865: Reserve Corps Gulf was discontinued and later incorporated into XIII Corps Gulf.
VI Corps Shenandoah
7 August 1864-6 December 1864
Horatio Gouverneur Wright 7 August 1864-16 October 1864
James Brewerton Ricketts temporary 16 October 1864-19 October 1864
George Washington Getty interim 19 October 1864
Horatio Gouverneur Wright 19 October 1864-6 December 1864
7 August 1864: VI Corps Potomac transferred from the Army of the Potomac to the Army of the Shenandoah.
6 December 1864: VI Corps Shenandoah transferred from the Army of the Shenandoah to the Army of the Potomac.
Cavalry Corps Shenandoah
7 August 1864-25 March 1865
Alfred Thomas Archimedes Torbert 7 August 1864-26 January 1865
Wesley Merritt 26 January 1865-25 March 1865
7 August 1864: Cavalry Corps was established in the Army of the Shenandoah.
25 March 1865: Cavalry Corps Shenandoah was discontinued, and its forces were incorporated into Sheridan’s Cavalry Command Potomac.
Cavalry Corps Mississippi
29 October 1864-17 April 1865
James Harrison Wilson 29 October 1864-17 April 1865
29 October 1864: Cavalry Corps Military Division of the Mississippi was established in the Military Division of the Mississippi from the former Cavalry Corps Cumberland and other cavalry detachments.
17 April 1865: Cavalry Corps Military Division of the Mississippi was discontinued.
XIV Corps Georgia
7 November 1864-17 June 1865
Jefferson Columbus Davis 7 November 1864-17 June 1865
7 November 1864: XIV Corps Cumberland transferred from the Army of the Cumberland to the “Army of Georgia”.
28 March 1865: XIV Corps Cumberland was assigned officially to the Army of Georgia.
17 June 1865: XIV Corps Georgia transferred from the Army of Georgia to the Military Division of the Mississippi.
XX Corps Georgia
7 November 1864-1 June 1865
Henry Warner Slocum 7 November 1864-11 November 1864
Alpheus Starkey Williams 11 November 1864-1 April 1865
Joseph Anthony Mower 1 April 1865-1 June 1865
7 November 1864: XX Corps Cumberland transferred from the Army of the Cumberland to the “Army of Georgia”.
28 March 1865: XX Corps Georgia was assigned officially to the Army of Georgia.
1 June 1865: XX Corps Georgia was discontinued.
Detachment Army of the Tennessee (XVI Corps)
7 November 1864-18 February 1865
Andrew Jackson Smith 7 November 1864-18 February 1865
7 November 1864: Detachment Army of the Tennessee XVI Corps established in the Army of the Tennessee from the discontinued Right Wing XVI Corps Tennessee.
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 renamed XVI Corps Gulf in the Army of the Gulf
XIX Corps Shenandoah
7 November 1864-20 March 1865
Cuvier Grover 7 November 1864-28 December 1864
William Hemsley Emory 28 December 1864-20 March 1865
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 Gulf’ were re-designated XIX Corps Shenandoah. The 3rd Division remained in Louisiana with the interim title XIX Corps Gulf.
20 March 1865: XIX Corps Shenandoah was discontinued.
XXIV Corps James
3 December 1864-1 August 1865
Edward Otho Cresap Ord 3 December 1864-5 December 1864
Alfred Howe Terry 6 December 1864-1 January 1865
Charles Devens temporary 2 January 1865-14 January 1865
John Gibbon 15 January 1865-27 April 1865
John Wesley Turner 27 April 1865-17 May 1865
John Gibbon 17 May 1865-8 July 1865
John Wesley Turner 8 July 1865-1 August 1865
3 December 1864: XXIV Corps was established in the Army of the James from forces in the discontinued X Corps James and XVIII Corps James.
1 August 1865: XXIV Corps James was discontinued.
XXV Corps James
3 December 1864-23 May 1865
Godfrey Weitzel 3 December 1864-31 December 1864
Charles Adam Heckman 1 January 1865-2 February 1865
Godfrey Weitzel 2 February 1865-23 May 1865
3 December 1864: XXV Corps James was established in the Army of the James by consolidating the black divisions from X Corps James and XVIII Corps James.
23 May 1865: XXV Corps James transferred from the Army of the James to the Military Division of the Southwest.
VI Corps Potomac #2
6 December 1864-28 June 1865
Horatio Gouverneur Wright 6 December 1864-16 January 1865
George Washington Getty temporary 16 January 1865-11 February 1865
Horatio Gouverneur Wright 11 February 1865-28 June 1865
6 December 1864: VI Corps Shenandoah transferred from the Army of the Shenandoah to the Army of the Potomac.
28 June 1865: VI Corps Potomac was discontinued.
Terry’s Provisional Corps Virginia and North Carolina
6 January 1865-18 January 1865
Alfred Howe Terry 6 January 1865-18 January 1865
6 January 1865: Terry’s Provisional Corps was established in the Department of Virginia and North Carolina; comprising parts of the former X Corps James.
18 January 1865: Terry’s Provisional Corps transferred from the Department of Virginia and North Carolina to the Department of Virginia.
Terry’s Provisional Corps Virginia
18 January 1865-31 January 1865
Alfred Howe Terry 18 January 1865-31 January 1865
18 January 1865: Terry’s Provisional Corps transferred from the Department of Virginia and North Carolina to the Department of Virginia.
31 January 1865: Terry’s Provisional Corps Virginia transferred from the Department of Virginia to the Department of North Carolina.
Terry’s Provisional Corps North Carolina
31 January 1865-23 March 1865
Alfred Howe Terry 31 January 1865-23 March 1865
31 January 1865: Terry’s Provisional Corps Virginia transferred from the Department of Virginia to the Department of North Carolina.
23 March 1865: Terry’s Provisional Corps North Carolina was discontinued, and its forces transferred to X Corps North Carolina.
XXIII Corps North Carolina
2 February 1865-1 August 1865
John McAllister Schofield 2 February 1865-31 March 1865
Jacob Dolson Cox 31 March 1865-1 August 1865
2 February 1865: XXIII Corps transferred from the Army of the Ohio to the Department of North Carolina but continued to be referred to unofficially as the “Army of the Ohio”.
1 August 1865: XXIII Corps North Carolina was discontinued.
XIII Corps Gulf #2
18 February 1865-20 July 1865
Gordon Granger 18 February 1865-20 July 1865
18 February 1865: XIII Corps Gulf was re-established in the Army of the Gulf, composed largely of troops previously in Reserve Corps Gulf.
27 June 1865: XIII Corps Gulf transferred from the Army of the Gulf to the Military Division of the Gulf.
20 July 1865: XIII Corps Gulf was discontinued.
XVI Corps Gulf
18 February 1865-20 July 1865
Andrew Jackson Smith 18 February 1865-20 July 1865
18 February 1865: The Detachment Army of the Tennessee was discontinued and reverted to the title XVI Corps Gulf. XVI Corps Gulf was established in the Army of the Gulf.
27 June 1865: XVI Corps Gulf transferred from the Army of the Gulf to the Military Division of the Gulf.
20 July 1865: XVI Corps Gulf was discontinued.
X Corps North Carolina
23 March 1865-1 August 1865
Alfred Howe Terry 23 March 1865-13 May 1865
Adelbert Ames 13 May 1865-1 August 1865
23 March 1865: X Corps was established in the Department of North Carolina, comprising forces previously in Terry’s Provisional Corps North Carolina.
1 August 1865: X Corps North Carolina was discontinued.
Sheridan’s Cavalry Command Potomac
26 March 1865-6 May 1865
Philip Henry Sheridan 26 March 1865-6 May 1865
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: Sheridan’s Cavalry Command James was discontinued.
IX Corps Washington
24 April 1865-27 July 1865
John Grubb Parke 24 April 1865-7 June 1865
Orlando Bolivar Willcox temporary 7 June 1865-26 June 1865
John Grubb Parke 26 June 1865-27 July 1865
24 April 1865: IX Corps Potomac transferred from the Army of the Potomac to the Department of Washington.
27 July 1865: IX Corps Washington was discontinued.
XXV Corps Southwest
23 May 1865-4 June 1865
Godfrey Weitzel 23 May 1865-4 June 1865
23 May 1865: XXV Corps transferred from the Army of the James to the Military Division of the Southwest.
4 June 1865: XXV Corps Southwest was discontinued.
XIV Corps Mississippi
17 June 1865-1 August 1865
Jefferson Columbus Davis 17 June 1865-1 August 1865
17 June 1865: XIV Corps Georgia transferred from the discontinued Army of Georgia to the Military Division of the Mississippi.
1 August 1865: XIV Corps Mississippi was discontinued.
VIII Corps Atlantic
27 June 1865-1 August 1865
Lewis Wallace 27 June 1865-1 August 1865
27 June 1865: VIII Corps Middle transferred from the Middle Military Division to the Military Division of the Atlantic.
1 August 1865: VIII Corps Atlantic was discontinued.
American Civil War High Command 