The monument for the Fourteenth United States Infantry on the south side of Boonsboro Pike east of Rodman Avenue. (Boonsboro Pike tour map)

From the marker:

U.S.A.
Fifth Army Corps

First Battalion (8 Cos.), Fourteenth U.S. Infantry 

Capt. W. Harvey Brown, 14th U.S. Infantry, Commanding.

September 17, 1862.

At 3 P.M. the First Battalion, Fourteenth U. S. Infantry, crossed the Antietam at the Middle Bridge, advanced on this road to this point and formed on the hill and in the ravine south of this tablet, the right of the Battalion resting on this road. At dusk, Companies F and G, deployed as skirmishers, advanced about 200 yards to Sherrick’s Lane, formed on the right of the Second and Tenth U.S. Infantry, and engaged the enemy.

The Battalion was withdrawn at dark and recrossed the Antietam.

No. 80.