Early in the morning the 20-pounder Parrott gun batteries of Taft, Langer, von Kleiser and Wever, First New York Artillery, were in position on the ridge east of the Antietam and north of Boonsboro Pike; Battery E (Benjamin's) 2nd U.S. and Battery I (Weed's) 5th U.S. on the ridge south of the Pike and all engaged the Confederate artillery on the heights east and north of Sharpsburg. About 8 a.m. four companies of the Fourth U.S. Infantry crossed the Antietam by the Middle Bridge and late in the day, engaged the Confederate infantry. About noon Morell's Division, Fifth Corps, arrived from Frederick and encamped near Keedysville. The Ninth Corps moved to the left on high ground opposite and commanding the lower stone bridge. Between 3 and 4 p.m., Hooker's (First) Corps crossed the Antietam by the Upper Bridge and a ford below it, moved westerly until it reached the high ground near the Hagerstown Pike, then changed direction to the left, moved south and encountered the Confederate outposts, on and near the Smoketown Road, about one and three quarter miles north from this point. The advance was continued under artillery and musketry fire until dark, when Hooker went into bivouack, the right of his line on the Hagerstonw Pike where it entered the East Woods from the North. During the night Mansfield's (Twelfth) Corps crossed the Antietam by the Upper Bridge and bivouacked about a mile in Hooker's rear.