Army and Corps Headquarters Markers
The marker is a 4.5 inch Siege Rifle (sometimes called a 4.5 inch Ordnance Rifle) cast by the Fort Pitt Foundry in Pittsburgh. It was placed in 1913 by the Gettysburg National Military Park Commission.
The headquarters was on Powers Hill, to the west of the marker.
Headquarters marker to the Union 12th Corps at Gettysburg
Text from the marker
Army of the Potomac
12th Corps Headquarters
Major General
Henry W. Slocum
July 1, 2, 3, 4, 1863
were located on Powers Hill
260 yards westerly
Location of the marker
The Headquarters marker is south of Gettysburg on the west side of the Baltimore Pike. It is about 500 feet northwest of the intersection with Granite Schoolhouse Lane. (39° 48.48′ N, 77° 13.071′ W)
Major General Henry W. Slocum
Major General Henry W. Slocum commanded the 12th Corps at the Battle of Gettysburg. Slocum (West Point Class of 1852) was a lawyer and state representative from New York. His equestrian monument with biographical information is on Steven’s Knoll.
Union Major General Henry W. Slocum