Under an unfortunate set of circumstances on September 13, 1862, the Confederates lost and the Union recovered a copy of Confederate battle plan Special Order 191. "If I can't beat Bobby Lee with this piece of paper, I will be willing to go home," said Union army leader George B. McClellan upon reading the document. Antietam: The Lost Order covers the hours between the time McClellan read Lee's plan and Lee's army reunited. Thirty-seven maps...