...bstantially over; thus Lee was able to reinforce against Cox, and further, A. P. Hill's Confederate division, en route from Harper's Ferry, was not far from Sharpsburg. Again, as if to favor Lee, Burnside had further delay. The excessive firing before and after crossing the Antietam had exhausted the ammunition of the leading division, so that Burnside had to send over Willcox's command to make repl...