Organized October 20, 1863, for garrison of forts in Boston Harbor. Ordered to Washington, D.C., and garrison duty in the Defenses of that city until August, 1864. Attached to 3rd Brigade, Hardin's Division, 22nd Army Corps, Dept. of Washington, May to August, 1864. Assigned to
3rd Heavy Artillery
as Company "G" August, 1864.