Army of the Trans-Mississippi

The Trans-Mississippi Army originally numbered well over 50,000 troops,^[3] but fewer than 43,000 were available by the end of the war.^[2][4] 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 May 12–13, 1865, by units of the Trans-Mississippi Army.

General E. Kirby Smith, who commanded the Army, surrendered to Union forces on May 26, 1865, although by that point many of his troops had already deserted.^[5] The last remaining Trans-Mississippi Army force – and also the last remaining Confederate force – was the 1st Cherokee Mounted Rifles, commanded by Brigadier-General Stand Watie. Watie surrendered on June 23.

• Third Corps, Trans-Mississippi Army (Headquartered at Shreveport, Department of Louisiana)

This corps was organized under the command of Simon Bolivar Buckner^[4]

• Second Corps, Trans-Mississippi Army (Department of Arkansas and Missouri)

This corps was organized on August 4, 1864, under the command of John B. Magruder.^[3][4]

• Third Corps, Trans-Mississippi Army (Headquartered at Galveston, Department of Texas)

This corps was organized on August 4, 1864, under the command of John George Walker.^[3][4]

• Cavalry Corps, Trans-Mississippi Army

The Cavalry Corps was organized on August 4, 1864, under the command of Sterling Price.^[3]

• Reserve Corps, Trans-Mississippi Army

The Reserve Corps was established on September 10, 1864, to support the Trans-Mississippi Army.