21st Connecticut Infantry Regiment

The regiment was attached to 2nd Brigade, 3rd Division, IX Corps, Army of the Potomac, to January 1863.

3rd Brigade, 2nd Division, VII Corps, Department of Virginia, to July 1863.

3rd Brigade, 1st Division, XVIII Corps, Department of Virginia and North Carolina, to December 1864.

3rd Brigade, 3rd Division, XXIV Corps, Department of Virginia, to June 1865.

Duty at Arlington Heights, Virginia, Defenses of Washington, D.C., November 1862.

Provost and guard duty at Portsmouth and Norfolk November 10.

Moved to Morehead City, North Carolina, February 3, then to New Bern February 12, and duty there, Plymouth, and Washington, North Carolina, April.

Butler's operations on south side of the James River and against Petersburg and Richmond May 10–28.

Siege operations against Petersburg and Richmond June 16, 1864 to April 2, 1865.