This regiment was originally accepted for state service for one year and was organized at Indianapolis for the U. S. service by volunteers from the companies in camp. It was one of the first four regiments volunteering from the state for three years and was mustered in June 19, 1861. It left the state July 4, and joined Gen. McClellan’s forces at Rich mountain, W. Va., July 10, participating in the battle at that place the following day. It was in numerous skirmishes about Cheat mountain in September, supported a battery at Green Brier in October and was in the battle of Camp Alleghany in December. The original strength of the regiment was 1,047.