U.S. Army - Army of the Potomac

Fourth Army Corps

Major General Erasmus D. Keyes

First Division

Bde. Gen. Darius N. Couch (until 7/12)

Bde. Gen. J. J. Abercrombie (after 7/12)

1st Brigade

Bde. Gen. I. N. Palmer (until 7/26)

Bde. Gen. Charles Devens Jr. (after 7/26)

2nd Brigade/ 3rd Brigade

Bde. Gen. J. J. Abercrombie (until 7/5)

Bde. Gen. John Cochrane (after 7/5)

redesignated 3rd Bde. 7/5

3rd Brigade/ 2nd Brigade

Bde. Gen. A. P. Howe

redesignated 2nd Bde. 7/5

Second Division

Brigadier General J. J. Peck

1st Brigade

Bde. Gen. H. M. Naglee (until 7/6)

Bde. Gen. W. H. Emory (after 7/6)

2nd Brigade

Brigadier General H. W. Wessells

3rd Brigade

Brigadier General O. S. Ferry

reconstituted 7/5

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