UNION MASSACHUSETTS VOLUNTEERS
4th Regiment, Massachusetts Heavy Artillery
Organized November l2, 1864, by consolidation of the 17th, 18th, 19th, 20th, 21st, 22nd, 23rd, 24th, 25th, 26th, 27th and 28th Unattached Companies Heavy Artillery. Organized August, 1864, for one year's service. Consolidated to a Regiment November 12, 1864. Attached to 3rd Brigade, DeRussy's Division, 22nd Army Corps, Dept. of Washington. Garrison duty in the Defences of Washington, south of the Potomac, till June, 1865. Mustered out June 17, 1865.
Lost during service 2 Officers and 23 Enlisted men by disease. Total 25.