20th Pennsylvania Infantry Regiment

1861
April 30	Organized at Philadelphia and mustered in under Colonel Wiliam H. Gray, Lieutenant Colonel George Moore and Major Andrew Tippin
June	Moved to Chambersburg, Pa. and attached to 3rd Brigade, 1st. Division, Patterson's Army
June 16	March to Williamsport, Md.
July 3	Occupation of Martinsburg
July 15	Advance on Bunker Hill
July 23	Moved to Harper's Ferry
August 6	Mustered out