United States Regiments & Batteries > Pennsylvania
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1861
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| April 20 | Organized at Philadelphia and mustered in for three months service under Colonel John F. Ballier, Lieutenant Colonel Charles Ernenwein and Major Adolph Mehler |
| May 28 | Moved to Chambersburg and attached to Geo. H. Thomas’ Brigade, 1st Division, Patterson’s Army |
| June 6 | March to Greencastle |
| June 15 | Cross Potomac and advance on Martinsburg Road |
| June 16-24 | At Williamsport |
| June 25 | At Downsville |
| July 2 | Falling Waters |
| July 3 | Occupation of Martinsburg |
| July 15 | Advance on Bunker Hill |
| July 17 | Moved to Charlestown, then to Harper’s Ferry |
| August | Moved by rail to Baltimore to Philadelphia |
| August 9 | Mustered out.Colonel Ballier was authorized to recruit another regiment for three years service, which became the 98th Pennsylvania Infantry. Many men of the 21st reenlisted in the 98th. |