This regiment was organized at Indianapolis in May, 1861, for one year, was mustered in May 11 and left for Evansville June 11, to take the place of the 11th regiment for blockade duty. It left the state on July 23, for Sandy Hook, Md., where it was assigned to Abercrombie’s brigade, Banks’ Army of the Shenandoah. The original strength of the regiment was 948.