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Organized at Fort Warren and mustered in July 5, 1861. Left State for Washington, D.C., August 7. At Camp Kalorama until August 18. Moved to Fort Albany. Garrison duty in the Defenses of Washington until January, 1862. Designation of Regiment changed by order of the War Department to 1st Massachusetts Heavy Artillery January 1, 1862. (See 1st Heavy Artillery.