Known as the Adirondack Regiment, the unit saw service along the Atlantic Coast in the Department of Virginia before transferring to the Army of the James in 1864.
Col. Samuel T. Richards received authority on July 7, 1862, to organize an infantry regiment of men from Clinton, Essex, and Warren counties.
The following April, the New Yorkers were sent Suffolk, Virginia and attached to the Reserve Brigade, 3rd Division, VII Corps (ACW), under the command of Brig.
During the winter of 1864–65, the 118th NY manned the trenches outside Richmond and in December was reassigned to the 2nd Brigade, 3rd Division, XXIV Corps (ACW).
After serving provost duty in Richmond and Manchester, the 118th NY Volunteers were mustered out of service on June 13, 1865.