ut him on the defensive by opening an artillery fire upon the Nationals at dawn （Sept. 16, 1862). He was ready for response in the course of the afternoon, when Hooker crossed the Antietam with a part of his corps, commanded by Generals Ricketts, Meade, and Doubleday. Hooker at once attacked the Confederate left, commanded by Stonewall Jackson, who was soon reinforced by General Hood.
Sumner was directed to send over Mansfield's corps during the night, and to hold his own in readiness to pass de of the creek greatly assisted in driving the Confederates away, with heavy loss,, beyond a line of woods.
It was at this time, when Hooker advanced, that Jackson was reinforced.
The Confederates swarmed out of the works and fell heavily upon Meade, when Hooker called upon Doubleday for help.
A brigade under General Hartsuff pressed forward against a heavy storm of missiles, and its leader was severely wounded.
Meanwhile Mansfield's corps had been ordered up, and before it became engaged