During the Battle of Antietam, Hood's division came to the relief of Stonewall Jackson's corps on the Confederate left flank, fighting in the infamous cornfield, and turning back an assault by the Union I Corps in the West Woods. Afterward, they became engaged with the Union XII Corps. In the evening after the battle, Gen. Lee asked Hood where his division was. He responded, "They are lying on the field where you sent them. My division has been almost wiped out." Of his 2,000 men, almost 1,000 were casualties. Jackson was impressed with Hood's performance and recommended his promotion to major general, which occurred effective October 10, 1862.