U.S. Army - Army of the Potomac

Twelfth Army Corps

Brigadier General Alpheus Williams (until 9/13)

Major General Henry W. Slocum (9/13 - 9/25)

First Division

Brigadier General J. F. Knipe (until 9/13)

Brigadier General Alpheus Williams (9/13 - 9/25)

1st Brigade

Colonel S. Ross (until 9/13)

Colonel J. F. Knipe (9/13 - 9/25)

3rd Brigade

Colonel E. A. Carmen (until 9/16)

Bde. Gen. Thomas H. Ruger (9/16 - 9/25)

Second Division

Brigadier General John W. Geary

1st Brigade

Lt. Colonel Ario Pardee (until 9/6)

Colonel Charles Candy (9/6 - 9/25)

2nd Brigade

Colonel George Cobham

3rd Brigade

Bde. Gen. George S. Greene

Artillery & Provost

10th Maine Infantry Regiment

1st New York Artillery, Battery M

Pennsylvania Independent Battery E

4th United States Artillery, Battery F

5th United States Artillery, Battery K