The U.S. Army of the Tennessee, commanded by Major General U.S. Grant, included a First Division under Major General John A. McClernand, a Second Division under Brigadier General W.H.L. Wallace, mortally wounded, then Colonel James M. Tuttle of the 2d Iowa, a Third Division under Major General Lewis Wallace, a Fourth Division under Brigadier General Stephen A. Hurlbut, a Fifth Division under Brigadier General William T. Sherman, wounded, and a Sixth Division under Brigadier General Benjamin M. Prentiss, captured. Except for the 3d Division, the army was encamped on this field on April 6, 1862, with its outer line of camps just beyond the Hamburg and Purdy Road, extending from Owl Creek on the right to Lick Creek on the left. The total strength of the five divisions on the field on Sunday, April 6, 1862, present for duty, officer and men, was 39,830. The Confederate army under General Albert Sidney Johnston, with an aggregate present for duty, officers and men of 43,968, attacked the Union army in front of its outer camps at 4.55 a.m. on Sunday, April 6, 1862. The Union army was gradually driven back until at 6 p.m. it occupied a line from Pittsburg Landing to Snake Creek Bridge on Savannah Road. During the night the 3d Division arrived on the field from Crump's, and three divisions of the Army of the Ohio commanded by General Buell arrived from Savannah. With these reinforcements General Grant attacked the Confederates on Monday morning, pressing them gradually back until 4 p.m., when they abandoned the field and retired toward Corinth. The casualties in the Army of the Tennessee during the battle were 1513 killed, 6601 wounded, and 2830 missing, for a total of 10,944.