Army of the Trans-Mississippi

Trans-Mississippi Army
Active	September 28, 1862 - May 26, 1865
Country	Confederate States of America
Branch	Confederate States Army
Role	Field army

The Army of the Trans-Mississippi was a major Confederate army under the Department of the Trans-Mississippi during the American Civil War. It was the last major Confederate command to surrender, submitting on May 26, 1865, exactly one month after General Johnston had surrendered in the eastern United States.

The Department of the Trans-Mississippi separated from the Western Department of the Confederacy on May 26, 1862. It consisted primarily of the four Confederate states west of the Mississippi: Texas, Louisiana, Arkansas, and Missouri and included two Confederate territories - the Indian Territory and Confederate Arizona (roughly corresponding to the present-day states of Oklahoma, New Mexico, and Arizona). The command of the area was given to Major-General T. H. Holmes. The Trans-Mississippi was the operational theater for many quasi-independent forces, including Quantrill's Raiders and the Missouri Bushwhackers.

The Army of the Trans-Mississippi originally numbered well over 50,000 troops, but fewer than 43,000 were available by the end of the war. Major campaigns included Sibley's New Mexico campaign, Banks' Red River campaign, and Price's Missouri campaign. The last battle of the Civil War, the Battle of Palmito Ranch, was fought on May 12-13 1865 by units of the Army of the Trans-Mississippi.

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