Chapter 12 BATTLE OF ANTIETAM.

The army had been re-organized. It was not altogether the same army which had fought the battles of the Peninsula. The First corps, under the command of General Hooker, contained Doubleday's, Meade's, and Ricketts's divisions. Doubleday's troops were formerly under McDowell. They had been under fire at Cedar Mountain, and held the left at Groveton.