138th Pennsylvania Infantry Regiment

The 138th Regiment, Pennsylvania Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.

The 138th Pennsylvania Infantry was organized at Harrisburg, Pennsylvania, and mustered in for a three-year enlistment on August 16, 1862, under the command of Colonel Charles L. K. Sumwalt.

The regiment was attached to Relay House, Defenses of Baltimore, VIII Corps, Middle Department, to February 1863.

3rd Separate Brigade, VIII Corps, to June 1863.

2nd Brigade, 3rd Division, III Corps, Army of the Potomac, to March 1864.

The 138th Pennsylvania Infantry mustered out of service on June 23, 1865.

Moved to Baltimore, Md., August 30, thence to Relay House.

Jerusalem Plank Road, Weldon Railroad, June 22–23.

Sheridan's Shenandoah Valley Campaign August to December.

March to Richmond, Va., thence to Washington, D. C., May 23-June 3, Corps review June 8.

Sergeant Nicholas G. Wilson of Co. G, 138th Pennsylvania Infantry Regiment. From the Liljenquist Family Collection of Civil War Photographs, Prints and Photographs Division, Library of Congress