U.S. Army - Army of the Potomac

Fourth Army Corps

Major General Erasmus D. Keyes

First Division

Bde. Gen. J. J. Abercrombie (until 8/12)

Bde. Gen. Darius N. Couch (after 8/12)

1st Brigade

Brigadier General Charles Devens Jr.

2nd Brigade

Brigadier General Albion P. Howe

3rd Brigade

Brigadier General John Cochrane

Second Division

Brigadier General J. J. Peck

1st Brigade

Brigadier General W. H. Emory (until 8/10)

Brigadier General H. M. Naglee (after 8/10)

2nd Brigade

Brigadier General H. W. Wessells

3rd Brigade

Brigadier General O. S. Ferry

Reserve Artillery

1st New York Artillery, Battery F

1st New York Artillery, Battery H

8th New York Independent Battery

1st Pennsylvania Artillery, Battery E

1st Pennsylvania Artillery, Battery H

5th United States Artillery, Battery M