Located on the west side of Richardson Avenue, north of the Boonsboro Pike. (Boonsboro Pike tour map)

From the marker:

U.S.A.
Fifth Army Corps

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

Captain David B. McKibbon, Commanding.

September 16-19, 1862.

On September 16, the Second Battalion, Fourteenth U.S. Infantry was in line on the east base of the ridge beyond the Antietam, in which position it remained until about 1 P.M. of the 17th when it crossed the Middle Bridge to support the Horse Batteries.

Late in the afternoon it advanced beyond the Batteries, moving in echelon on the right of the Fourth U.S. Infantry, and occupied this line covering Piper’s Lane and its approaches on the right with skirmishers thrown forward to the crest of the hill to the west.

It was withdrawn, about sunset, and recrossed the Antietam, where it remained in its original position until the morning of the 19th.

No. 84.