U.S. Army - Army of the Potomac

Fifth Army Corps

Brigadier General Fitz John Porter

First Division

Brigadier General George W. Morrell

First Brigade

Colonel James Barnes

Second Brigade

Bde. Gen. Charles Griffin

Third Brigade

Colonel H. S. Lansing (until 9/18)

Colonel T. B. W. Stockton (after 9/18)

Second Division

Brigadier General George Sykes

First Brigade

Lt. Colonel R. C. Buchanan

Second Brigade

Lt. Colonel William Chapman

Third Brigade

Colonel G. K. Warren

Third Division

Brigadier General Andrew A. Humphreys

First Brigade

Bde. Gen. E. B. Tyler

reorganized 9/12

Second Brigade

Colonel P. H. Allabach

Artillery Reserve

1st Brigade Horse Artillery

to Cavalry Division

2nd Brigade

broken up to 3rd, 5th & 9th Corps

3rd Brigade

to 5th Corps Reserve Artilery (see below)

4th Brigade

to 6th Corps

5th Brigade

broken up to 3rd & 9th Corps

Reserve Artillery

1st New York Artillery Bn., Battery A

1st New York Artillery Bn., Battery B

from Artillery Reserve (see above)

1st United States Artillery, Battery K

4th United States Artillery, Battery G

Cavalry

4th Pennsylvania Cavalry Regiment

to Averill's Cavalry Bde.

8th Illinois Cavalry Regiment

to Cavalry Div., 2nd Bde.