The 63rd Pennsylvania Infantry was organized at Pittsburgh, Pennsylvania, in August 1861 and mustered in for a three-year enlistment under the command of Colonel Alexander Hays.
The regiment was attached to Jameson's Brigade, Heintzelman's Division, Army of the Potomac, to March 1862.
1st Brigade, 3rd Division, III Corps, Army of the Potomac, to August 1862.
1st Brigade, 1st Division, III Corps, to March 1864.
2nd Brigade, 3rd Division, II Corps, to September 1864.
The 63rd Pennsylvania Infantry mustered out beginning July 31, 1864, and concluding September 11, 1864.
Veterans and recruits were transferred to the 105th Pennsylvania Infantry.
Pohick Church and the Occoquan March 5, 1862 (detachment).
Duty in the defenses of Washington and guarding fords in Maryland until October.
March up the Potomac to Leesburg, then to Falmouth, Va., October 11 – November 19.
Burnside's second Campaign, "Mud March," January 20–24, 1863.
Siege of Petersburg and Richmond June 16 – September 5.
Demonstration on north side of the James River at Deep Bottom July 27–29.