The 137th Pennsylvania Infantry was organized at Harrisburg, Pennsylvania, and mustered in for a nine-month enlistment on August 25, 1862 under the command of Colonel Henry M. Bossert.
The regiment was attached to 1st Brigade, 2nd Division, VI Corps, Army of the Potomac, to December 1862.
Provisional Brigade, Aquia Creek, Virginia, Patrick's Command, Army of the Potomac, to January 1863.
The 137th Pennsylvania Infantry mustered out of service on June 1, 1863.
In the defenses of Washington, D.C. until December, and at Aquia Creek, Va., until January 1863.