1861–1865 - Civil War

Key facts about the American Civil War Confederate Army of Tennessee.

Union Major General Samuel Curtis organized the Army of the Border to confront Confederate Major General Sterling Price's Army of Missouri as it marauded through Missouri during October 1864.

Basic facts about the Union Army of the Border, which battled Major General Sterling Price's Army of Missouri during Price's Missouri Expedition of 1864.

During the American Civil War, the Union Army of the Cumberland participated in nearly all of the major campaigns in the Western Theater.

Key facts about the American Civil War Union Army of the Cumberland.

Formed from forces in the field from Missouri and Kansas the short-lived Army of the Frontier fought to maintain Union control of Missouri during 1862 and 1863.

Key facts about the Union Army of the Frontier.

An amalgamation of troops assigned to the Department of the Gulf from 1862 through 1865, the Army of the Gulf served as an occupation force in New Orleans (1862-1863) and as the main Union command during the Red River Campaign during the American Civil War.

Key facts about the Union Army of the Gulf.

During the American Civil War, Lieutenant General Ulysses S. Grant consolidated troops from the Department of Virginia and North Carolina to form the Army of the James to support his Overland Campaign in 1864.

Key facts about the Union Army of the James.

Officially organized on March 5, 1862, the Army of the Mississippi transitioned into the Army of Tennessee, the Confederacy's preeminent fighting force in the Western Theater of the American Civil War.

Key facts about the Confederate Army of the Mississippi.

Created on February 23, 1862, the Army of the Mississippi participated in the Battle of Island No. 10, the Siege of Corinth, the Battle of Iuka, and the Battle of Corinth II, before being discontinued on October 26, 1862.

Key facts about the Union's first Army of the Mississippi.

Unofficially organized and discontinued in January 1863, the second Army of the Mississippi easily overran Brigadier-General Thomas J. Churchill's Confederate garrison at Fort Hindman during the Battle of Arkansas Post (January 9-11, 1863).

Key facts about the Union's second Army of the Mississippi.

The Army of the Mountain Department was the unofficial designation for a force of roughly 25,000 Union soldiers commanded by Major General John C. Frémont during the Shenandoah Valley Campaign of 1862.

Key facts about the Army of the Mountain Department.

Created on June 8, 1861, from troops in western Virginia, the Confederate Army of the Northwest participated in the Battle of Rich Mountain, the Battle of Cheat Mountain, and the Romney Expedition before being dissolved on February 9, 1862.