From the marker:

C.S.A.

Colquitt's and Garland's Brigades

September 17, 1862.

After the repulse of the Confederate line in the East Woods and Cornfield north of the Smoketown Road in the morning of the 17th, parts of the Brigades of Colquitt and Garland rallied in the Sunken Road at this point, their right connecting with Rodes, their left resting on the Hagerstown Pike. They cooperated with Rodes in repelling the advance of French's Division, Second Corps, and, in cooperation with detachments of McLaws' and Walker's Division, crossed this road and attacked the right flank of French's Division but were repulsed. In the afternoon, parts of the two Brigades were collected at Sharpsburg and moved out on the Boonsboro Pike in support of Evans' Brigade in its resistance to the advance of a portion of the Fifth Army Corps.

Levi B Smith