12th Regiment, Missouri Cavalry (Union)

Organized at St. Louis, Mo., November 3, 1863, to March 23, 1864. Attached to District of St. Louis, Mo., Dept. Missouri, to July, 1864. 1st Brigade, 1st Cavalry Division, District of West Tennessee, Dept. Tennessee, to November, 1864. 1st Brigade, 5th Division, Cavalry Corps. Military Division Mississippi, to May, 1865. Dept. Missouri, Eastern Division, Powder River Expedition, and District of the Plains to April, 1866.