It was during the Maryland Campaign that Hill was mistakenly sent two copies of Special Order 191. The second copy, which came to be known as the "lost copy" was found on September 13 by a Union soldier who quickly sent it up the chain of command to McClellan. Now McClellan knew the details of how Lee had weakened his forces by splitting them up into several columns. It also laid out where each part of his army was to be at any given time. McClellan acted, quicker than usual, and attacked Lee's positions. Hill's outnumbered men delayed the Union advance at the Battle of South Mountain long enough for Lee to regroup. Three days later Hill's division defended the "Bloody Lane" against several Union attacks at the Battle of Antietam before being driven back. Hill's division was also in the Battle of Fredericksburg. In 1863 Hill was sent to help defend Southern Virginia and North Caroline. He never returned to Lee's army. He was next sent west to command a Corps under Lieutenant general Braxton Bragg. At the Battle of Chickamauga Hill led his corps. But he did not get along at all with Bragg and was left without a command. This also stopped his promotion to Lieutenant general. He did not command troops again until the 