United States Regiments & Batteries > Massachusetts
Essex County Regiment
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1861
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| July 5 | Organized at Fort Warren and mustered in |
| August 7 | Left State for Washington, D.C.; At Camp Kalorama |
| August 18 | Moved to Fort Albany. Garrison duty in the Defenses of Washington |
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1862
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| January 1 | Designation of regiment changed by order of the War Department to 1st Massachusetts Heavy Artillery Regiment. |