U.S. Army - Army of the Potomac

Second Army Corps

Brigadier General William Hays (until 8/16)

Major General Gouverneur Warren (8/16 - 8/26)

Brigadier General John C. Caldwell (after 8/26)

First Division

Brigadier General J. C. Caldwell

1st Brigade

Colonel N. A. Miles

2nd Brigade

Colonel P. Kelly

3rd Brigade

Colonel P. Frank

4th Brigade

Colonel J. R. Brooke (until 8/29)

Colonel J. A. Beaver (after 8/29)

Second Division

Brigadier General W. Harrow (until 8/15)

Brigadier General A. S. Webb (after 8/15)

1st Brigade

Colonel F. E. Heath (until 8/28)

Colonel DeWitt C. Baxter (after 8/28)

2nd Brigade

Bde. Gen. Alexander Webb (until 8/15)

Lt. Colonel W. L. Curry (after 8/15)

3rd Brigade

Colonel J. E. Mallon

Third Division

Brigadier General Alexander Hays (to 8/15)

Brigadier General J. T. Owen (after 8/15)

1st Brigade

Colonel Joseph Snider

2nd Brigade

Colonel T. J. Smythe (until 8/14)

Lt. Colonel T. H. Davis (after 8/14)

3rd Brigade

Colonel John Coons (until 8/15)

Bde. Gen. J. T. Owen (after 8/15)

Artillery Brigade

1st New York Artillery, Battery G

from Artillery Reserve, 4th Volunteer Bde.

1st Pennsylvania Artillery, Battery F

from Artillery Reserve, 3rd Volunteer Bde.

1st Pennsylvania Artillery, Battery G

from Artillery Reserve, 3rd Volunteer Bde.

1st Rhode Island Artillery, Battery A

1st Rhode Island Artillery, Battery B

1st United States Artillery, Battery I