Organized at Pittsburg as 33rd Regiment August 31, 1861. Left state for Washington, D. C., August 31, 1861. Designation changed to 62nd Pennsylvania Volunteers November 18, 1861. Attached to Morrell's Brigade, Fitz John Porter's Division, Army Potomac, to March, 1862. 2nd Brigade, 1st Division, 3rd Army Corps, Army Potomac, to May, 1862. 2nd Brigade, 1st Division, 5th Army Corps, to July, 1864.