3rd Regiment, Missouri State Militia Cavalry (2nd Organization) (Union)

Reorganized from 10th Regiment State Militia Cavalry February 2, 1863. Attached to District of St. Louis, Mo., Dept. of Missouri, to June, 1863. District of Southeast Missouri, Dept. of Missouri, to July, 1863. District of St. Louis, Mo., Dept. of Missouri, to July, 1865.