...er, he had intently watched, from a rock, south of the Boonsboro road, on the summit of the hill east of Sharpsburg, the fierce contests on his left and at the same time had observed the movements of Burnside on his right. His eighty guns, in well chosen and commanding positions, had promptly responded to the still larger number of McClellan beyond the Antietam; his batteries in front of Sharpsburg comm...