This marker is one of the roughly two dozen that have disappeared over the years, but records provide its location and text. It was on the north side of the sunken Road at the Observation Tower.

U.S.A.

Battery K, 1st U.S. Artillery

Captain William M. Graham, U.S.A., Commanding.

(September 17, 1862.)

This Battery moved from the bivouac of the Artillery Reserve, near Porterstown, crossed the Antietam at Pry’s Ford, passed the Neikirk farm buildings and, following the ravines, came into position about 40 yards north of this point on the right of Richardson’s Division, and engaged a section of Confederate Battery—two brass guns—about 700 yards southwest, which soon retired. It then assisted in repelling a charge of Confederate Infantry through Piper’s Cornfield. Two Confederate Batteries, rifled guns, now opened on the Battery, one of which enfiladed it and, in an engagement of about thirty-five minutes, it suffered heavy losses. The Battery was unable to reach the enemy, who had rifled guns of greater range than Captain Graham’s smooth-bores, and was withdrawn by General Richardson to avoid useless sacrifice of men and horses. General Richardson was mortally wounded while personally directing the fire of the Battery.

No. 98.

See more on the history of the 1st United States Artillery, Battery K in the Civil War