Fourth Division - Army of the Ohio
Brigadier General William Nelson

The head of this division arrived opposite to Pittsburg Landing about 5 p.m., April 6, 1862. One brigade, Ammen's, crossed the river and parts of the Thirty-sixth Indiana and Sixth Ohio were engaged in the closing action of Sunday. At 9 p.m. the entire division had crossed the Tennessee River and formed along the north side of Dill Branch, where it bivouacked Sunday night with pickets across the branch. At 5:30 a.m. on the 7th the division advanced and at 7 a.m. formed on south side of the branch and awaited the completion of the line. At 8 a.m. it attacked the Confederates in the Peach Orchard. Mendenhall's battery with the right Terrill's battery with the left. The division gained the south side of the Peach Orchard at 2 p.m., the Confederates retiring. This closed the conflict on the left. The division remained in line until night and bivouacked with its left in Stuart's camps, its right near Prentiss's headquarters.

Tenth Brigade - Colonel Jacob Ammen

Nineteenth Brigade - Colonel William B. Hazen

Twenty-second Brigade - Colonel Sanders D. Bruce

Cavalry