1st Battalion, Massachusetts Heavy Artillery

Organized April, 1865, from 1st, 2nd and 4th Unattached Companies Heavy Artillery.

Company "A" on duty at Fort Warren, Boston Harbor, till December 24, 1864. At Champlain, N. Y., till May 13, 1865, and at Fort Warren till October, 1865. Mustered out October 20, 1865.

Company "B" at Fort Warren till August, 1864, and at New Bedford, Mass., till June, 1865. Mustered out June 29, 1865.

Company "C" on duty at Fort Warren till October, 1865. Mustered out October 20, 1865.

Company "D" at Fort Independence to September, 1865. Mustered out September 12, 1865

Companies "E" and "F" organized August 15, 1864, for one year. On duty at Fort Warren. Mustered out June 28, 1865.