...of the forces, while Burnside's force was on the left, at least three miles from where my command was, without any troops being between us, and with Antietam creek, which was not fordable, behind us. Fitz John Porter 's corps was behind my position, a mile and a half on the opposite sided of Antietam creek, as a reserve, but it was never brought into action except in small squads. Notwithstanding the disadvant...