United States Regiments & Batteries > District of Columbia
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1861
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| April | Organized at Washington, D.C., for the defense of that city. Attached to Mansfield’s Command, Dept. of Washington, D.C. |
| June 10-July 7 | Expedition to Rockville, Md. |
| June 17 | Action at Seneca Mills |
| July 7 | Great Falls |
| July | Mustered out |