3rd Regiment, US Reserve Corps, Missouri Infantry (3 months 1861) (Union)

Organized at Turner Hall, St. Louis, Mo., May 8, 1861. Attached to Lyons' Army of the West. Capture of Camp Jackson May 10. Provost duty at St. Louis till July 1. Three Companies sent to Southwest Missouri July 1. Expedition to Northern Missouri against Harris July 16 (7 Cos.). Action at Fulton July 17. Duty at Fulton and St. Louis till August 18. Mustered out August 18, 1861.