U.S. Army

22nd Army Corps, Department of Washington

Major General C. C. Augur

Defences North of the Potomac

Brigadier General Martin D. Hardin

First Brigade

Colonel J. H. Kitching (to 9/17)

Lt. Colonel T. Allcock

Second Brigade

Lt. Colonel H.G. Thomas

Third Brigade

Lt. Colonel J.H. Oberteuffer

Defences South of the Potomac

Bde. Gen. G. A. DeRussy

First Brigade

Colonel J.N.G. Whistler

Second Brigade

Colonel T. Wilhelmn (to 9/29)

Lt. Colonel James Brady

Third Brigade

Colonel William Heine (to 9/23)

Major W.H.H. Beadle

Fourth Brigade

Colonel A. Farnsworth

Independent Cavalry Brigade

Colonel H.M. Lazelle

2nd Massachusetts Cavalry Regiment

to Dept. Mountains, 1st Div. Cav., 2nd Bde.

13th New York Cavalry Regiment

16th New York Cavalry Regiment

District of Alexandria

Brig. Gen. John P. Slough

4th Delaware Infantry Regiment

1st District of Columbia Infantry Regt.

26th Michigan Infantry, Company F

Pennsylvania Independent Battery H

St. Mary's District

Bde. Gen. James Barnes

5th Massachusetts Cavalry Regiment

2nd Wisconsin Battery

District of Washington

Colonel M. N. Wisewell

First Brigade

Colonel G. W. Gile

150th Pennsylvania Infantry, Co. K

Light Artillery Camp Camp Berry

Bde. Gen. A. P. Howe (to 9/22)

Major J. A. Hall

16th Massachusetts Battery

1st United States Artillery, Batteries A&E

3rd United States Artillery, Batteries L&M

4th United States Artillery, Battery A

5th United States Artillery, Battery I