On September 13, while about south of Frederick, Maryland, Corporal Barton W. Mitchell of the 27th Indiana Volunteers (Union Army) found a bundle of cigars wrapped inside some paper. The paper turned out to be Special Order 191. The field had recently been occupied by Confederate General Hill and the order was addressed to General Hill. He gave the order to his sergeant who passed it up the chain of command to General McClellan. The division's adjutant general, Samuel Pittman, was able to confirm it was the handwriting of his former colleague before the war, Robert Chilton, who was Lee's adjutant general. It was in McClellan's hands the same day.