United States Regiments & Batteries > Pennsylvania
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1861
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| July – August | Organized at Philadelphia as 30th Pennsylvania Volunteers |
| September | Designation changed to 66th Pennsylvania Infantry Regiment |
| September 20 | Moved to Washington, D.C. Attached to Abercrombie’s Brigade, Banks’ Division, Army of the Potomac |
| October | Duty on the Upper Potomac at Frederick, Md. |
| October 21-24 | Operations on the Potomac |
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1862
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| February | Ordered to Washington, D.C. |
| March 1 | Consolidated with 73rd and 99th Pennsylvania Volunteers |