Organized at Harrisburg June 21, 1861. Moved to a point opposite Cumberland, Md., June 22; thence into West Virginia in support of Lew Wallace. Duty on State line till July 27. Ordered to Harper's Ferry August 1. Assigned to George H. Thomas' Brigade, Banks' Division, and duty at Harper's Ferry till October. Moved to Tennallytown, Md., October 1. Attached to 2nd Brigade, McCall's Pennsylvania Reserves Division, Army of the Potomac, to March, 1862. 1st Brigade, 2nd Division, 1st Army Corps, Army of the Potomac, to April, 1862. 3rd Brigade, McCall's Division, Dept. of the Rappahannock, to June, 1862. (Cos. "C," "G," "H" and "I" detached May 12, 1862, and attached to Bayard's Cavalry Brigade, Dept. of the Rappahannock, to June, 1862. 1st Corps, Army of Virginia, to August, 1862.) 3rd Brigade, 3rd Division, 5th Army Corps, Army of the Potomac, to August, 1862. 3rd Brigade, 3rd Division, 3rd Corps, Army of Virginia, to September, 1862. 1st Brigade, 3rd Division, 1st Army Corps, Army of the Potomac, to February, 1863. 1st Brigade, Pennsylvania Reserve Division, 22nd Corps, Dept. of Washington, to June, 1863. 1st Brigade, 3rd Division, 5th Army Corps, Army of the Potomac, to June, 1864.