The 19th Connecticut Infantry Regiment was organized beginning July 25, 1862, and continued through September 9, 1862, at Litchfield, Connecticut, under the command of Colonel Leverette Ward Wessells.
The regiment was attached to Slough's Brigade, District of Alexandria, Defenses of Washington, to January 1863.
Tyler's Command, District of Alexandria, Military District of Washington, and XXII Corps, Department of Washington, to April 1863.
2nd Brigade, DeRussy's Division, XXII Corps, to November 1863.
Guard and patrol duty at Alexandria, Virginia, January 12, 1863.