Organized as 14th Massachusetts Infantry July 5, 1861. Designation chanced to 1st Heavy Artillery January 1, 1862. Attached to Wadsworth's Command, Military District of Washington, January to May 1862. Whipple's Brigade, Military District of Washington, to December, 1862. Artillery, District of Alexanderia, Defences of Washington, to February, 1863. Artillery, District of Alexandria, 22nd Army Corps, to April, 1863. 1st Brigade, DeRussy's Division, 22nd Army Corps, to April, 1864. 2nd Brigade, Tyler's Heavy Artillery Division, Army of the Potomac, to May 1864. 2nd Brigade, 3rd Divsion, 2nd Army Corps, Army of the Potomac to May 1865. Defences of Washington, 22nd Army Corps, to August, 1865. (Cos. "B," "C," "H," and "I" attached to Defences of Upper Potomac, 8th Army Corps, Middle Department, to June, 1863. Maryland Brigade, French's Command, 8th Army Corps, to July, 1863. Artillery Reserve, Army of the Potomac, to August, 1863. Unattached, Maryland Heights Division, Dept of West Virginia, to December 1863.)
SERVICE: Garrison duty in the Defences of Washington at Forts Albany, Runyon, Scott, Righcardson, Barnar, Craig and Tillinghast till August 23, 1862. Moved to Cloud's Mills August 23. March to Manassas, Va., August 26-30. Return to Washington and garrison Forts Albany, Craig, Tillinghast, Woodbury and DeKalb, Defenses South of the Potomac till May, 1864. (Cos. "H" and "I" detached September 27, 1862, and moved to Harper's Ferry, W. Va. Co. "C" ordered to Harper's Ferry Oct 27, 1862. Co. "B" ordered to Harper's Ferry, W. Va., December 23, 1862; garrison duty there till July 1, 1863. Co. "I" moved to Winchester June 10, 1863, and participated in the Battle of Winchester June 13-15, and retreat to Harper's Ferry. Defense of Harper's Ferry June 16-July 1. Evacuation of Harper's Ferry and march to Frederick, Md., July 1-2. Duty with Artillery Reserve, Army of the Potomac, to July 11-22. Moved to Harper's Ferry July 22 and duty there till December 1, when ordered to Washington and rejoin regiment). Regiment moved to join Army of the Potomac at Belle Plain, Va., May 15-16, 1864. Harris Farm, Fredericksburg Road, May 19. Spottsylvania Court House May 19-21. North Anna River May 23-26. Line of the Pamunkey May 26-28. Totopotomoy May 28-31. Cold Harbor June 1-12. Before Petersburg June 16-19. Siege of Petersburg June 16, 1864, to April 2, 1865. Jerusalem Plank Road June 22-23, 1864. Deep Bottom July27028. Mine Explosion, Petersburg, July 30 (Reserve). Strawbery Plains August 14-18. Peeble's Farm September 29-October 2. Boydton Plank Road, Hatcher's Run, October 27-28. Expedition to Weldon Railroad December 7-12. Dabney's Mills, Hatcher's Run, February 5-7, 1865. Appomattox Campaign March 28-April 9. Crow's House March 31. Fall of Petersburg April 2. Sailor's Creek April 6. High Bridge, Farmville, April 7. Appomattox Court House April 9. Surrender of Lee and his army. March to Burkesville April 11-13 and duty there till May 2. March to Washington May 2-15. Camp at Bailey's Cross Roads till June 15. Grand Review May 23. Duty at Forts Ethan, Allen and Marcy till June 27. At Forts C. F. Smith and Strong till July 19, and at Fort Bunker Hill till August 17. Mustered out August 16, 1865, and discharged at Gallop's Island, Boston Harbor, August 25, 1865.
Regiment lost during service 9 Officers and 232 Enlisted men killed and mortally wounded and 2 Officers and 241 Enlisted men by disease. Total 484.