Organized at St. Louis, Mo., September 3, 1861. Attached to 4th Division, Army of the West, to February, 1862. District of Rolla and District of St. Louis, Mo., Dept. of Missouri, to October, 1862. Campaign in Missouri September, 1861, to February, 1862. Duty guarding railroad beyond Rolla and in Southwest Missouri February to October, 1862. Mustered out October 6, 1862.