U.S. Army - Army of the Potomac

Third Army Corps

Major General Samuel P. Heintzelman

First Division(after 8/5)
Third Division(until 8/5)

Brigadier General Philip Kearney

redesignated from 3rd Division 8/5

1st Brigade

Bde. Gen. John C. Robinson

2nd Brigade

Brigadier General David B. Birney

3rd Brigade

Colonel Orlando Poe

Second Division

Brigadier General Joseph Hooker

1st Brigade

Brigadier General C. Grover

2nd Brigade

Colonel Nelson Taylor

3rd Brigade

Bde. Gen. F. E. Patterson

Artillery

1st New Jersey Artillery, Battery B

to 3rd Div. Artilery

1st New York Artillery, Battery D

6th New York Independent Battery

4th United States Artillery, Battery K

to 3rd Div. Artilery