U.S. Army - Army of the Potomac - Fifth Army Corps

Third Division

Brigadier General Truman Seymour

Transferred to the Army of Virginia's 3rd Corps as 3rd Division on August 26, 1862

First Brigade

Colonel William Sinclair

1st Pensylvania Reserves Regiment

2nd Pensylvania Reserves Regiment

5th Pensylvania Reserves Regiment

8th Pensylvania Reserves Regiment

Second Brigade

Colonel A. L. Magilton

3rd Pensylvania Reserves Regiment

4th Pensylvania Reserves Regiment

7th Pensylvania Reserves Regiment

11th Pensylvania Reserves Regiment

Third Brigade

Colonel C. F. Jackson

6th Pensylvania Reserves Regiment

to Army of Virginia,
3rd Corps, 3rd Div., 3rd Bde.

9th Pensylvania Reserves Regiment

10th Pensylvania Reserves Regiment

12th Pensylvania Reserves Regiment

1st Pennsylvania Rifles

Artillery

Battery A, 1st Pennsylvania Artillery

Battery B, 1st Pennsylvania Artillery

to Army of Virginia,
3rd Corps, 3rd Div. Artillery

Battery G, 1st Pennsylvania Artillery

Battery C, 5th United States Artillery