Organized at Philadelphia August 18, 1861. Left State for Washington, D. C., September 17. Attached to Baker's Brigade, Stone's (Sedgwick's) Division, Army Potomac, to March, 1862. 2nd Brigade, 2nd Division, 2nd Army Corps. Army Potomac, to June, 1864. 3rd Brigade, 2nd Division, 2nd Army Corps, to June, 1865.