21st Pennsylvania Infantry

Regimental History and Service Record

DESIGNATIONS

Date(s)	Designation	Brigaded with
April 20, 1861	Organized at Harrisburg, Pennsylvania (Dauphin County)	3 Month term of service
June 1861 - July 1861	(I) Dept. of Pennsylvania / 1st Div. / 1st Brig. (Dept.) Patterson / (1) Cadwallader / (1) Thomas	6th Pennsylvania Infantry 17th Pennsylvania Infantry (I) 23rd Pennsylvania Infantry 2nd United States Cavalry 1st Rhode Island Light Artillery Battery
August 9, 1861	Mustered out of service	x

UNIT HISTORY

In Brief

Organized at Philadelphia and mustered in April 20, 1861 for a 3 month term of service
Moved to Chambersburg May 28
Attached to Department of Pennsylvania / 1st Division (Cadwallader) / 1st Brigade (Thomas), Brigaded with:
- 6th Pennsylvania Infantry
- 17th Pennsylvania Infantry
- (I) 23rd Pennsylvania Infantry
- 2nd United States Cavalry
- 1st Rhode Island Light Artillery Battery
March to Greencastle June 6
Cross Potomac and advance on Martinsburg Road June 15
At Williamsport June 16-24
At Downsville until July 1
July 2, 1861 - Action at Falling Waters, West Virginia
Occupation of Martinsburg July 3
Advance on Bunker Hill July 15
Moved to Charlestown July 17; thence to Harper's Ferry
Mustered out August 9, 1861

SEE "REGIMENT STATISTICAL INFORMATION" SECTION BELOW FOR CASUALTIES TAKEN BY THIS REGIMENT

1861