The discovery by Union troops of a copy of Gen. Robert E. Lee’s Special Order 191 on Sept. 13, 1862, had significant consequences for the Maryland Campaign, which ended days later when Confederate forces were checked on the battlefield of Antietam. Hailed as one of the most consequential intelligence breaks of the Civil War, what became known as the Lost Orders involved three soldiers from Company F of the 27th Indiana Infantry. Here's the story.