...s's feeble line was scarcely war. The artillery tore, but did not stay them. They pressed forward until Sharpsburg was uncovered and Lee's line of retreat was at their mercy. But then, just then, A. P. Hill , picturesque in his red battle-shirt, with 3 of his brigades, 2500 men, who had marched that day 17 miles from Harper's Ferry and had waded the Potomac, appeared upon the scene. Tired and footsore,...