Volunteers was a heavy artillery regiment that served in the Union Army during the American Civil War.
The regiment operated as both heavy artillery and infantry beginning in December 1862 while serving in the defenses of Washington, D.C., and continued in both capacities until the end of the war.
The regiment was attached to Defenses North of the Potomac River, September 1862 to February 1863.
2nd Brigade, Haskin's Division, XXII Corps, Department of Washington, to May 1864.
Tyler's Heavy Artillery Division, II Corps, Army of the Potomac, May 18–29, 1864.
Defenses of Baltimore, Maryland, VIII Corps, Middle Department, to August 1865.
Moved to Washington, D.C., August 19, 1862, and duty in the defenses of that city until December 19, 1862.