Washington Artillery, Longstreet's Command

   The Washington Artillery crossed the Antietam about 9 A.M. of the 15th and took position on the high ground overlooking the creek to the east and south of Sharpsburg. The left wing, composed of the 1st and 3rd Companies, rested on the Boonsboro Pike, on ground now occupied by the National Cemetery; the right, composed of the 2nd and 4th Companies, was posted on the bluffs commanding the approaches to the Burnside Bridge. During the afternoon of the 15th and morning of the 16th it became engaged with the enemy's heavy Batteries on the opposite side of Antietam Creek.