The 33rd Missouri Infantry Regiment was organized at Benton Barracks August 29 through September 5, 1862 and mustered in for three-years service under the command of Colonel Clinton B. Fisk.
1st Brigade, 13th Division, XIII Corps, Department of the Tennessee, to February 1863.
1st Brigade, 4th Division, XVI Corps, Army of the Tennessee, January 1864.
3rd Brigade, 1st Division (detachment), Army of the Tennessee, Department of the Cumberland, to February 1865.
Ordered to the field in Missouri September 22, 1862, and operations in Phelps, Dent, Texas, and Wright Counties until December 19.
Moved to St. Louis, then to Columbus, Kentucky, December 19–25, thence to Helena, Arkansas, January 5, 1863.
Expedition to Yazoo Pass, and operations against Fort Pemberton and Greenwood February 24 – April 8.
March in pursuit of Price through Arkansas and Missouri to Cape Girardeau, Mo., September 17-October 9.
Moved to St. Louis, Missouri, then to Nashville, Tennessee, November 24 – December 1.
Campaign against Mobile, Alabama, and its defenses March 17 – April 12.
March to Montgomery April 13–25, then to Selma May 1, and duty there until July 20.