...d, after a very obstinate resistance for many hours to the vast forces brought against him, had, with the reinforcements sent to his assistance in the latter part of the day, retired late at night to Sharpsburg on the western side of the Antietam. A position had been taken on the morning of the 15th by the force north of the Potomac, consisting of D. H. Hill's division, five brigades; the three remaini...