During the

American Civil War The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by states ...

, a department was a geographical command within the Union's military organization, usually reporting directly to the

War Department War Department may refer to: * War Department (United Kingdom) * United States Department of War (1789–1947) See also * War Office, a former department of the British Government * Ministry of defence * Ministry of War * Ministry of Defence * D ...

. Many of the Union's departments were named after rivers or other bodies of water, such as the

Department of the Potomac The Army of the Potomac was the principal Union Army in the Eastern Theater of the American Civil War. It was created in July 1861 shortly after the First Battle of Bull Run and was disbanded in June 1865 following the surrender of the Confedera ...

and the

Department of the Tennessee Department may refer to: * Departmentalization, division of a larger organization into parts with specific responsibility Government and military *Department (administrative division), a geographical and administrative division within a country, ...

. The geographical boundaries of such departments changed frequently, as did their names. As the armies became larger Departments began to be subordinated to

Military Division A division is a large military unit or formation, usually consisting of between 6,000 and 25,000 soldiers. In most armies, a division is composed of several regiments or brigades; in turn, several divisions typically make up a corps. Historic ...

s, and the Departments were often sub divided into Districts and from 1862

Subdistricts A subdistrict or sub-district is an administrative division that is generally smaller than a district. Equivalents * Administrative posts of East Timor, formerly Portuguese-language * Kelurahan, in Indonesia * Mukim, a township in Brunei, Indon ...

. Much information on Civil War departments can be found in Eicher & Eicher, ''Civil War High Commands''.

Civil War

1861

Eastern Theater

Department of the East The Department of the East was a military administrative district established by the U.S. Army several times in its history. The first was from 1853 to 1861, the second Department of the East, from 1863 to 1873, and the last from 1877 to 1913. H ...

, to August 17, 1861 (Discontinued) *

Department of Washington Department of Washington, was a department of the Union Army constituted on April 9, 1861. It consisted of the District of Columbia to its original boundaries, and the State of Maryland as far as Bladensburg. It was merged into the Military D ...

, April 9, 1861 - July 25, 1861 (Merged into Military District of the Potomac) *

Department of Pennsylvania The Department of Pennsylvania (or General Patterson's Army) was a large military unit in the Union Army at the outset of the American Civil War. Established on April 27, 1861, its territory consisted of Pennsylvania, Delaware, and all of Maryland ...

, April 27, 1861 - July 25, 1861 (Merged into Department of the Potomac) *

Department of Annapolis Department may refer to: * Departmentalization, division of a larger organization into parts with specific responsibility Government and military *Department (administrative division), a geographical and administrative division within a country, ...

, April 27, 1861, - July 19, 1861; renamed Department of Maryland, July 19, 1861 - July 25, 1861, (Merged into Dept. of Pennsylvania) *

Department of Virginia The Department of Virginia and North Carolina was a United States Military department encompassing Union-occupied territory in the Confederate States during the Civil War. In 1863 it was formed by the merging of two previously existing departme ...

, May, 1861 - July 15. 1863 (Merged into Dept. of Virginia and North Carolina) * Department of Northeastern Virginia, May 27, 1861 – July 25, 1861 (Merged into the Military District of the Potomac) *

Department of the Shenandoah The Army of the Shenandoah was a Union army during the American Civil War. First organized as the ''Department of the Shenandoah'' in 1861 and then disbanded in early 1862, it became most effective after its recreation on August 1, 1864, under Phi ...

July 19, 1861 - August 17, 1861 (Merged into the Department of the Potomac) * Military District of the Potomac July 25 - August 15, 1861: renamed Department and Army of the Potomac, August 15, 1861 - June 27, 1865 ** Coast Division, 1861–62 ** Dix's Division, 1861–62 * Department of New England, Oct 1, 1861 - February 20, 1862. (Discontinued) * Department of New York, October 26, 1861 - January 3, 1863 (Merged into Department of the East) * Department of the Rappahannock, April 4, 1862 - June 26, 1862 (Merged into the

Army of Virginia The Army of Virginia was organized as a major unit of the Union Army and operated briefly and unsuccessfully in 1862 in the American Civil War. It should not be confused with its principal opponent, the Confederate Army of ''Northern'' Virginia ...

) * Mountain Department, March 11, 1862 - June 26, 1862 (Merged into the

)

Lower Seaboard Theater

* Department of Florida, Apr. 13, 1861 - March 15, 1862 (Merged into Department of the South) * South Carolina Expeditionary Corps, October 1861 - April 1862

Western Theater

Department of the Cumberland The Army of the Cumberland was one of the principal Union armies in the Western Theater during the American Civil War. It was originally known as the Army of the Ohio. History The origin of the Army of the Cumberland dates back to the creation ...

, September–November 1861;

Army of the Ohio The Army of the Ohio was the name of two Union armies in the American Civil War. The first army became the Army of the Cumberland and the second army was created in 1863. History 1st Army of the Ohio General Orders No. 97 appointed Maj. Gen. ...

, 1861 - October 24, 1862 (Renamed (Army of the Cumberland) * Department of the Ohio and Department of the Ohio (Louisville), May 3, 1861 - March 11, 1862 (dissolved and merged into the Department of the Mississippi and the Mountain Department) ** Army of Occupation of Western Virginia, June 14 - September 19, 1861 * Department of Kentucky, May 28, 1861 - August 15, 1861 (Merged into the Dept. of the Cumberland) * Department of Western Virginia, October 11, 1861 - March 11, 1862. (Merged into Mountain Department) ** District of the Kanawha, 1861-62 (Merged into Mountain Department) ** Railroad District, 1861–62 ** Camp Carlisle, VA, later renamed Camp Willey, WV, 1861–64 ** Post at Grafton, WV, 1862 ** Post at Point Pleasant, WV, 1862

Trans-Mississippi Theater

Department of the West The Department of the West, later known as the Western Department, was a major command ( Department) of the United States Army during the 19th century. It oversaw the military affairs in the country west of the Mississippi River to the borders of C ...

, to July 3, 1861 (merged into the Western Department) ** Army of the West , July 2 - August 10, 1861 * Western Department, July 3 - November 9, 1861 ** Kansas Brigade, 1861 ** Army of the West, July 2 - August 10, 1861 ** Western Army, September 14 - October 24, 1861 *

Department of the Missouri The Department of the Missouri was a command echelon of the United States Army in the 19th century and a sub division of the Military Division of the Missouri that functioned through the Indian Wars. History Background Following the successful ...

, November 9, 1861–62 ** District of Cairo, 1861–62 ** District of Southeast Missouri, 1861 ** District of Central Missouri, 1861–65 ** Southwestern District, 1861–62 **

St. Louis District ST, St, or St. may refer to: Arts and entertainment * Stanza, in poetry * Suicidal Tendencies, an American heavy metal/hardcore punk band * Star Trek, a science-fiction media franchise * Summa Theologica, a compendium of Catholic philosophy an ...

, 1861–65 ** Army of the West, 1861 *

Department of Kansas The Department of Kansas was a Union Army command department in the Trans-Mississippi Theater during the American Civil War. This department existed in three different forms during the war. 1861 The first "Department of Kansas" was created on ...

, November 9, 1861–65 * Department of New Mexico, to July 3, 1861, (merged into Western Department); Restored November 9, 1861 - June 27, 1865 ** post at Albuquerque, NM, - 1865 ** District of Santa Fe, 1861–62 ** Eastern District of New Mexico, 1861–62 ** Southern District of New Mexico, 1861–62

Pacific Theater

* Pacific Department, January 15, 1861 - July 27, 1865 **

District of California The District of California was a Union Army command department formed during the American Civil War. The district was part of the Department of the Pacific, the commander of the department also being District commander. The district was created a ...

, January 15, 1861–64 ** District of Oregon, January 15, 1861- July 27, 1865 **

District of Southern California The District of Southern California was a nineteenth century district of Department of the Pacific, a command of the United States Army. History Department of the Pacific was created January 15, 1861, during the American Civil War. The District o ...

, September 25, 1861 - July 27, 1865 ** California Volunteers, August 1861 - 1866 ** Column from California, December 9, 1861–62 ** District of Humboldt, December 12, 1861 - 1869

1862

Eastern Theater

Department of North Carolina The Department of Virginia and North Carolina was a United States Military department encompassing Union-occupied territory in the Confederate States during the Civil War. In 1863 it was formed by the merging of two previously existing departme ...

, January 7, 1862 - July 15, 1863 (Merged into Department of Virginia and North Carolina) **

Burnside's North Carolina Expedition Burnside's North Carolina Expedition (also known as the Burnside Expedition) was a series of engagements fought along the North Carolina Coast between February and June 1862. The expedition was part of Winfield Scott's overall Anaconda Plan, which ...

, February - June 1862 * Middle Department, March 22, 1862 - June 26, 1862; consolidated Middle Department and 8th Army Corps, June 26, 1862 - June 27, 1865 **

VIII Corps 8th Corps, Eighth Corps, or VIII Corps may refer to: * VIII Corps (Grande Armée), a unit of the Imperial French army during the Napoleonic Wars * VIII Army Corps (German Confederation) * VIII Corps (German Empire), a unit of the Imperial German Ar ...

, July 12, 1862 - June 26, 1862 ** Railroad District, June 26, 1862 - Sept. 20, 1862 * Department of the Rappahannock, April 4, 1862 - June 26, 1862 (Merged into the Army of Virginia) *

, Recreated April 4, 1862 - June 26, 1862 (Merged into Army of Virginia) *

, June 26, 1862 - September 12, 1862 (Merged into Army of the Potomac) ** I Corps, Army of Virginia from Mountain Department, June 26, 1862 - September 12, 1862 (renamed XI Corps) ** II Corps, Army of Virginia from Dept. of the Shenandoah, June 26, 1862 - September 2, 1862 (renamed XII Corps) ** III Corps, Army of Virginia from Dept. of the Rappahannock, June 26, 1862 - September 2, 1862 (renamed I Corps) * Department and Army of the Potomac, - 1865 ** Coast Division, - February 1862 (to Burnside's North Carolina Expedition) ** Dix's Division, - March 22, 1862, (to Middle Department) **

I Corps I Corps, 1st Corps, or First Corps may refer to: France * 1st Army Corps (France) * I Cavalry Corps (Grande Armée), a cavalry unit of the Imperial French Army during the Napoleonic Wars * I Corps (Grande Armée), a unit of the Imperial French A ...

, March 3, 1862 - June 26, 1862 (to Army of Virginia) ** I Corps, September 2, 1862 - ** II Corps, March 3, 1862 - 1863 ** III Corps, March 3, 1862 - 1863 ** IV Corps, March 3, 1862 - August 1862, to Dpt. of Virginia **

V Corps 5th Corps, Fifth Corps, or V Corps may refer to: France * 5th Army Corps (France) * V Cavalry Corps (Grande Armée), a cavalry unit of the Imperial French Army during the Napoleonic Wars * V Corps (Grande Armée), a unit of the Imperial French Ar ...

, March 3, 1862 - 1863 **

VI Corps 6 Corps, 6th Corps, Sixth Corps, or VI Corps may refer to: France * VI Cavalry Corps (Grande Armée), a cavalry formation of the Imperial French army during the Napoleonic Wars * VI Corps (Grande Armée), a formation of the Imperial French army du ...

, June 26, 1862 - 1863 **

IX Corps 9 Corps, 9th Corps, Ninth Corps, or IX Corps may refer to: France * 9th Army Corps (France) * IX Corps (Grande Armée), a unit of the Imperial French Army during the Napoleonic Wars Germany * IX Corps (German Empire), a unit of the Imperial Germ ...

, July 22, 1862 - 1863 **

XI Corps 11 Corps, 11th Corps, Eleventh Corps, or XI Corps may refer to: * 11th Army Corps (France) * XI Corps (Grande Armée), a unit of the Imperial French Army during the Napoleonic Wars * XI Corps (German Empire), a unit of the Imperial German Army * ...

, September 12, 1862 – 1864 **

Military District of Washington The United States Army Military District of Washington (MDW) is one of nineteen major commands of the United States Army. Its headquarters are located at Fort Lesley J. McNair in Washington, D.C. The missions of the units in the Military Distri ...

, 1862 *** Sturgis' Division - June 26, 1862 (Merged into Army of Virginia) ** Defenses of Harpers Ferry, WV (Pleasant Valley, MD), 1862 ** Defenses of Washington, 1862-1863 *** Military Defenses, Southwest Potomac, 1862 * Department of Virginia, - July 15. 1863

Lower Seaboard Theater

* Department of Key West, February 1862 - March 15, 1862.(Merged into Department of the South) *

Department of the Gulf The Department of the Gulf was a command of the United States Army in the nineteenth and early twentieth centuries and of the Confederate States Army during the Civil War. History United States Army (Civil War) Creation The department was co ...

, February 23, 1862 - June 27, 1865 ** Army of the Gulf, February 23, 1862 - June 27, 1865 ** Troops in West Florida, August 8, 1862 - 1863 (from Dept. of the South) *

Department of the South The Department of the South was a military department of the United States Army that existed in several iterations in the 19th century during and after the American Civil War. 1862–65 After the first 11 months of the American Civil War, startin ...

, March 15, 1862 - June 28, 1865 ** South Carolina Expeditionary Corps - April 1862 ** Western District, 1862 ** Southern District, 1862 ** Northern District, 1862 ** U.S. Forces, Edisto and James Islands, SC, 1862 ** posts at Hilton Head, SC, 1862–64 ** posts at St. Augustine, FL, 1862–63 ** posts at Fort Taylor, FL, 1862 ** posts at Fort Pickens, FL, 1862 ** Troops in West Florida - August 8, 1862 - 63(annexed to Dept. of the Gulf)

Western Theater

Department of the Ohio The Department of the Ohio was an administrative military district created by the United States War Department early in the American Civil War to administer the troops in the Northern states near the Ohio River. 1st Department 1861–1862 Gener ...

- August 19, 1862 - January 17, 1865 (Annexed to Department of the Cumberland) ** District of Louisville, 1862 ** Railroad District of Western Virginia, Sept. 1862 - Jan 1863 ** District of Western Kentucky, 1862–63 ** Army of Kentucky, 1862–63 ** District of Central Kentucky, 1863 ** District of Ohio, 1863 ** Army of Ohio in the Field, 1863 ** (Military) District of Kentucky, 1863–65 *

, October 24, 1862 - June 27, 1865 **

Army of the Cumberland The Army of the Cumberland was one of the principal Union armies in the Western Theater during the American Civil War. It was originally known as the Army of the Ohio. History The origin of the Army of the Cumberland dates back to the creation ...

, October 24, 1862 - June 27, 1865 * Mountain Department March 11, 1862 - June 26, 1862 (Merged into

) ** Cheat Mountain District, 1862. ** District of the Kanawha, 1862. ** Railroad District, March 11, 1862 - July 7, 1862 * Department of Mississippi March 15 - September 19, 1862 * Department and Army of the Tennessee, October 16, 1862 - August 1, 1865

Trans-Mississippi Theater

, 1862–65 *

Department of the Northwest The Department of the Northwest was an U.S. Army Department created September 6, 1862 to put down the Sioux uprising in Minnesota. Major General John Pope was made commander of the Department. At the end of the Civil War the Department was rede ...

September 6, 1862 - June 27, 1865 (merged with the Department of the Missouri) * Department of Kansas, - 1865 * Department of New Mexico, to June 27, 1865 ** District of Santa Fe, - 1862 ** Eastern District of New Mexico, - 1862 ** Southern District of New Mexico, - 1862 ** post at Albuquerque, NM, - 1865 ** post at Fort Canby, NM, 1862–65 ** post at Fort Craig, NM, 1862–65 ** post at Las Cruces, NM, 1862–65 ** post at Los Pinos, NM, 1862–65 ** post at Fort Marcy, NM, 1862–65 ** post at Camp Mimbres, NM, 1862–65 ** post at Fort Sumner, NM, 1862–65 ** post at Fort West, NM, 1862–65

Pacific Theater

* Pacific Department, - July 27, 1865 ** District of California, - 1864 ** District of Oregon, - 1865 ** District of Southern California, - 1865 ** California Volunteers, - 1866 ** District of the Humboldt, - 1869 ** Column from California, - August 30, 1862 **

District of Arizona District of Arizona was a subordinate district of the Department of New Mexico territory created on August 30, 1862 and transferred to the Department of the Pacific in March 1865. District of Arizona (Dept. of New Mexico) commanders Headquarter ...

, (headquarters at Franklin, TX) August 30, 1862 - 1865 **

District of Utah During the American Civil War in the early 1860s, the District of Utah was a subordinate district of the U.S. Army's Department of the Pacific. The district was composed of territorial areas that later became parts of the modern U.S. states of Id ...

August 6, 1862 - July 27, 1865

1863

Eastern Theater

, January 3, 1863 - 1873 ** District of Western New York, 1864–65 ** District of Northern New York, 1864–65 ** District of New Jersey, 1865 ** District of Rhode Island and Connecticut, 1865 ** District of Maine, 1865–66 ** District of Massachusetts, New Hampshire, and Vermont, 1865–66 ** District of Northern and Western New York, 1865–66 ** District of Champlain, 1866 * consolidated Middle Department and 8th Army Corps, June 26, 1862 - June 27, 1865 ** Defenses of the Upper Potomac, Jan 5 - Feb 1863. (Discontinued) ** District of Delaware, 1863–65 * Department and Army of the Potomac, - 1865 ** I Corps, September 2, 1862 - ** II Corps, March 3, 1862 - 1863 ** III Corps, March 3, 1862 - 1863 ** IV Corps, March 3, 1862 - August 1862, to Department of Virginia **

, March 3, 1862 - 1863 **

, June 26, 1862 - 1863 **

, July 22, 1862 - April 2, 1863 to Department of Ohio **

, September 12, 1862 – 1864 * consolidated Department of Washington and XXII Corps, February 2, 1863 - 1865 *

Department of the Susquehanna The Department of the Susquehanna was a military department created by the United States War Department during the Gettysburg Campaign of the American Civil War. Its goal was to protect the state capital and the southern portions of the commonwealt ...

, June 9, 1863 - December 1, 1864 (Changed to Dept. of Pennsylvania) * Department of Virginia - July 15, 1863 * Department of North Carolina - July 15, 1863 *

Department of Virginia and North Carolina The Department of Virginia and North Carolina was a United States Military department encompassing Union-occupied territory in the Confederate States during the Civil War. In 1863 it was formed by the merging of two previously existing departmen ...

, July 15, 1863 - January 31, 1865

Lower Seaboard Theater

* Department of the South, 1863- June 28, 1865 **

X Corps (Union Army) X Corps was a corps of the Union Army during the American Civil War. It served during operations in South Carolina in the Department of the South, and later in Benjamin Butler's Army of the James, during the Bermuda Hundred and Petersburg Campai ...

, 1863 ** posts at Hilton Head, SC, -1864 ** posts at St. Augustine, FL, - 1863

Western Theater

* Department of the Monongahela, June 9, 1863 - April 6, 1864 (Merged into Dept. of the Susquehanna) *

Department of West Virginia Department may refer to: * Departmentalization, division of a larger organization into parts with specific responsibility Government and military *Department (administrative division), a geographical and administrative division within a country, ...

, June, 1863 - June 27, 1865 *

- October 16, 1863 ** District of Indiana, March 23, 1863 - June 5, 1863 ** District of Indiana and Michigan, June 5, 1863 - September 11, 1863 ** District of Indiana, September 11, 1863 - November 16, 1863 ** Railroad District of Western Virginia, - Jan 1863 ** District of Western Kentucky, - 1863 ** Army of Kentucky, - 1863 ** District of Central Kentucky, 1863 ** District of Ohio, 1863 ** Army of Ohio in the Field, 1863 ** (Military) District of Kentucky, 1863–65 *

, 1863 - October 16, 1863 **

, 1863 - June 27, 1865 * Department and Army of the Tennessee, 1863 - October 16, 1863 *

Military Division of the Mississippi The Military Division of the Mississippi was an administrative division of the United States Army during the American Civil War that controlled all military operations in the Western Theater from 1863 until the end of the war. History The Divisio ...

, October 16, 1863 – August 6, 1866 ** Department of the Cumberland, October 16, 1863–65 ** Department of the Ohio, October 16, 1863–65 ** Department of the Tennessee, October 16, 1863–64 ** XIX Corps, 1864 **

, 1865

Trans-Mississippi Theater

* Department of the Northwest, - June 27, 1865 * Department of the Missouri, - 1865 * Department of Kansas, - 1865 * Department of New Mexico, to June 27, 1865 ** post at Albuquerque, NM, - 1865 ** post at Fort Canby, NM, - 1865 ** post at Las Cruces, NM, - 1865 ** post at Los Pinos, NM, - 1865 ** post at Fort Marcy, NM, - 1865 ** post at Camp Mimbres, NM, - 1865 ** post at Fort Sumner, NM, - 1865 ** post at Fort West, NM, - 1865 ** District of Fort Craig, August 27, 1864 – November 23, 1864 *** post at Fort Craig, NM, August 27, 1864 – November 23, 1864 *** Fort McRae, NM, Oct. 1863 - 1876 ** post at Franklin, TX, 1863-64.

Pacific Theater

* Department of the Pacific - July 27, 1865

1864

Eastern Theater

Middle Military Division The Middle Military Division was an organization of the Union Army during the American Civil War, responsible for operations around the Shenandoah Valley of Virginia and the Valley Campaigns of 1864. In the summer of 1864, Confederate General Ju ...

, August 6, 1864 - June 27, 1865 ** consolidated Middle Department and 8th Army Corps, - June 27, 1865 *** District of Delaware, - 1865 *** District of Eastern Shore of Maryland, 1864–65 **

December 1, 1864–65 **

, 1864 **

, 1864–65 **

, 1864-65. * Department and Army of the Potomac, 1864 - June 27, 1865 * Department of Virginia and North Carolina - January 31, 1865 **

Army of the James The Army of the James was a Union Army that was composed of units from the Department of Virginia and North Carolina and served along the James River during the final operations of the American Civil War in Virginia. History The Union Department ...

, April 28, 1864 - August 1, 1865 *** XVIII Corps, April 28, 1864 - December 3, 1864 ***

X Corps 10th Corps, Tenth Corps, or X Corps may refer to: France * 10th Army Corps (France) * X Corps (Grande Armée), a unit of the Imperial French Army during the Napoleonic Wars Germany * X Corps (German Empire), a unit of the Imperial German Army * ...

, April 28, 1864 - December 3, 1864 *** XXV Corps, December 3, 1864 - May, 1865 *** XXIV Corps, December 3, 1864 - August 1, 1865 ** Expedition to Fort Fisher, December, 1864 - January 15, 1865

Lower Seaboard Theater

* Department of the South, 1864 - June 28, 1865 ** U.S. Forces, Morris Island, SC, 1864–65; ** posts at Hilton Head, SC, -1864 ** Northern District, 1864–65 ** District of Florida, 1864–65 * Department of the Gulf, - May 7, 1864 * Military Division of West Mississippi May 7, 1864 - May 1865 (Discontinued) ** consolidated Department of Arkansas and 7th Army Corps, May 7, 1864 - March 21, 1865 (transferred to Military Division of Missouri) *** District of Little Rock, May 7, 1864 - March 21, 1865 *** Fort Smith and Indian Territory, May 7, 1864 - March 21, 1865 ** Department of the Gulf, May 7, 1864 - May, 1865

Western Theater

* Northern Department, January 12, 1864 - June 27, 1865 ** District of Illinois, 1864–65 *** Post at Camp Douglas (Post of Chicago), 1864–65 ** District of Indiana, 1864–65 *** Post at Rock Island Barracks, IL, *** Post at Camp Carrington, 1864–65 *** Post at Evansville, 1864–65 *** Post at Indianapolis, 1864–65 *** Post at Madison, 1864–65 *** Post at Camp Morton, 1864–65 *** Post atBurnside Barracks (Indianapolis), 1864–65 *** Post at New Albany, IN, 1864–65 ** District of Michigan, 1864–65 *** Post of Detroit, MI, 1864–65 ** U.S. Forces, Johnson's Island, OH, 1864 ** Post at Johnson's Island, OH, 1864-65. ** Post at Sandusky, OH, 1864-65. * Military Division of the Mississippi, - August 6, 1866 ** Department of the Cumberland, - 1865 ** Department of the Ohio, - 1865 *** District of East Tennessee April 10, 1864 - Jan. 4, 1865 (to Dept. of the Cumberland) ** Department of the Tennessee, - 1864; to Army of Georgia ** XIX Corps, 1864 *

Army of Georgia The Army of Georgia was a Union army that constituted the Left Wing of Major General William T. Sherman's Army Group during the March to the Sea and the Carolinas Campaign. History During Sherman's Atlanta Campaign in 1864, his Army Group wa ...

, November 1864 - June 1, 1865 **

XIV Corps 14 Corps, 14th Corps, Fourteenth Corps, or XIV Corps may refer to: * XIV Corps (Grande Armée), a unit of the Imperial French Army during the Napoleonic Wars * XIV Corps (German Empire), a unit of the Imperial German Army prior to and during World ...

November 1864 - June 1, 1865 ** XX Corps November 1864 - June 1, 1865

Trans-Mississippi Theater

* Department of the Northwest, - June 27, 1865 * Department of the Missouri, - 1865 *

, 1864–65 ** District of North Kansas, 1864–65 ** Districts of South Kansas, 1864–65 ** East Sub-district of Nebraska, 1864–65 *consolidated

Department of Arkansas The Department of the Arkansas was a territorial department of the United States Army during the American Civil War. History The Department of the Arkansas was created on January 6, 1864, to consist of Union occupied Arkansas, except Fort Smith. F ...

and 7th Army Corps, January 6, 1864 - May 7, 1864, to Military Division West Mississippi ** District of Little Rock, January 6, 1864 - March 21, 1865 ** Fort Smith, April 17, 1864 - March 21, 1865 * Department of New Mexico, to June 27, 1865 ** District of Northern Arizona October 23, 1863 - 1864 "I. All of the Territory of Arizona lying north of the Gila River and west of the Colorado, except that portion occupied by Fort Mojave, which post at present is garrisoned and supplied from the Department of the Pacific, is hereby created into a new military district to be known as the District of Northern Arizona." - GENERAL ORDERS, HDQRS. DEPARTMENT OF NEW MEXICO, Numbers 27. Santa Fe, N. Mex., October 23, 1863. OFFICIAL RECORDS: Series 1, vol 50, Part 2 (Pacific), Chapter LXII. CORRESPONDENCE-UNION AND CONFEDERATE. Page 653

Pacific Theater

* Department of the Pacific - July 27, 1865 ** District of California ***Sub-district of Nevada (headquartered at Fort Churchill) ** District of Oregon

1865

Eastern Theater

* Middle Military Division, - June 27, 1865 ** consolidated Middle Department and 8th Army Corps, - June 27, 1865 *** District of Delaware, - 1865 *** District of Eastern Shore of Maryland, - 1865 *** District of Delaware and Eastern Shore of Maryland, 1865 *** District of Western Maryland, 1865 *** District of West Virginia, 1865 *** District of Baltimore, 1865 - 1866 ** Department of Pennsylvania, - 1865 ** Department of Washington, - 1865 ** Department of West Virginia, - 1865 * Department and Army of the Potomac, 1864 - June 27, 1865 * Department of Virginia and North Carolina, - January 31, 1865 ** Army of the James, - January 31, 1865 *** XXV Corps, - January 31, 1865 *** XXIV Corps, - January 31, 1865 ** Expedition to Fort Fisher, - January 15, 1865 * Department of Virginia and Army of the James, January 31, 1865 - April 19, 1865 ** Army of the James, January 31, 1865 - August 1, 1865 *** XXV Corps, January 31, 1865 - May, 1865 *** XXIV Corps, January 31, 1865 - August 1, 1865 ** District of Eastern Virginia, 1865 *** Sub District of Appomattox, 1865 *** Sub District of Holston, 1865 ** Provost Marshal field organizations, Bermuda Hundred, Drummondtown, Camp Hamilton, Norfolk, Onancock, and Petersburg, VA, 1865 ** U.S. Forces, Petersburg, VA, 1865 ** Defenses of Norfolk and Portsmouth, VA, 1865 ** Camp of Distribution, Richmond, VA, 1865; **

Libby Prison Libby Prison was a Confederate prison at Richmond, Virginia, during the American Civil War. In 1862 it was designated to hold officer prisoners from the Union Army. It gained an infamous reputation for the overcrowded and harsh conditions. Priso ...

, Richmond, VA, 1865 ** Norfolk Military Prison, VA, 1865 ** post at Newport News, VA, 1865. ** post at Petersburg, VA, 1865. **

, January 31, 1865 - April 19, 1865 * Military Division of the James, April 19, 1865 - June 27, 1865 **

, April 19, 1865 - June 27, 1865 **

, April 19, 1865 - June 27, 1865 ** Army of the James, April 19, 1865 - August 1, 1865 *** XXV Corps, April 19, 1865 - May, 1865 *** XXIV Corps, April 19, 1865 - August 1, 1865

Lower Seaboard Theater

* Department of the South, - June 28, 1865 ** U.S. Forces, Morris Island, SC, -1865 ** (Military) District of Eastern South Carolina, 1865 ** District of Savannah, 1865 ** posts at Jacksonville, FL, 1865

Western Theater

* Military Division of the Mississippi, - August 6, 1866 ** Department of the Cumberland, - 1865 *** District of East Tennessee, January. 4 - March. 17, 1865 (to Dept. of the Cumberland) ** Department of the Ohio, - 1865 **

, 1865 *

, November 1864 - June 1, 1865 ** XIV Corps - June 1, 1865 ** XX Corps - June 1, 1865 * Department of Kentucky, February 10, 1865 - June 27, 1865

Trans-Mississippi Theater

* Department of the Northwest, - June 27, 1865 * Department of the Missouri, - June 27, 1865 * Department of Kansas, - June 27, 1865 ** District of North Kansas, - 1865 ** Districts of South Kansas, - 1865 ** East Sub-district of Nebraska, - 1865 * Department of New Mexico, to June 27, 1865 (became District of New Mexico, Department of California, Military Division of the Pacific) * Military Division of the Southwest May 29, 1865 - June 27, 1865. (Territory in the Trans - Mississippi south of the

Arkansas River The Arkansas River is a major tributary of the Mississippi River. It generally flows to the east and southeast as it traverses the U.S. states of Colorado, Kansas, Oklahoma, and Arkansas. The river's source basin lies in the western United Stat ...

- Major General

Philip H. Sheridan Philip, also Phillip, is a male given name, derived from the Greek (''Philippos'', lit. "horse-loving" or "fond of horses"), from a compound of (''philos'', "dear", "loved", "loving") and (''hippos'', "horse"). Prominent Philips who popularize ...

. Merged into the Military Division of the Gulf) ** Department of Louisiana and Texas, May 29, 1865 - June 27, 1865 ** Southern Division of Louisiana, May 29, 1865 - June 27, 1865.

Pacific Theater

* Department of the Pacific - July 27, 1865 (Merged into the Military Division of the Pacific) **

(headquarters at Prescott) March 7, 1865 - July 27, 1865 * Military Division of the Pacific July 27, 1865 - July 3, 1891 ** Department of California, 1865-1913 ** Department of the Columbia, 1865-1913 *** U.S. Forces, San Juan Island, 1865–72

Notes

References

* Eicher, John H., &

David J. Eicher David John Eicher (born August 7, 1961) is an American editor, writer, and popularizer of astronomy and space. He has been editor-in-chief of ''Astronomy'' magazine since 2002. He is author, coauthor, or editor of 23 books on science and American ...

, Civil War High Commands, Stanford University Press, 2001, .
National Archives, Guide to Federal Records; Records of United States Army Continental Commands, 1821-1920 (Record Group 393), 1817-1940 (bulk 1817-1920)
{{DEFAULTSORT:Union Army Divisions, Departments and Districts Departments and districts of the United States Army Union Army departments