The monument to the 8th United States Infantry Regiment is south of Gettysburg near Meade’s Headquarters at the Leister House. (39.814573° N, 77.232562° W; Google map; Tour map: Taneytown Road)

Monument to the 8th United States Infantry at Gettysburg

The 8th United States was the only regiment of Regular infantry in the Army of the Potomac not attached to the Division of Regulars in the Fifth Corps. It was assigned to Army Headquarters as Provost Guard.

From the monument:

Army of the Potomac
Headquarters, Provost Guard

Eighth U.S. Infantry
Eight companies,
Captain Edwin W.H. Read commanding

July 2 Arrived in the morning and engaged in provost duty until the close of battle.

See more on the 8th United States Infantry in the Civil War