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.M.C. Marble (to 8/16)

Colonel J. H. Kitching

Second Brigade

Colonel W.H. Hayward

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

Third Brigade

Colonel W.S. Irwin(August 22)

Colonel William Heine

Fourth Brigade

Major C.C. Meservey (to 8/6)

Colonel A. Farnsworth

Independent Cavalry Brigade

Colonel H.M. Lazelle

2nd Massachusetts Cavalry Regiment

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

139th Ohio Infantry Regiment

mustered out

2nd Wisconsin Battery

District of Washington

Colonel M. N. Wisewell

First Brigade

Colonel G. W. Gile

Second Brigade

Colonel W. H. Brownd

discontinued 8/1

150th Pennsylvania Infantry, Co. K

Light Artillery Camp Camp Berry

Bde. Gen. A. P. Howe (to 8/9)

Bde. Gen. A. P. Howe

16th Massachusetts Battery

6th New York Independent Battery

to Army Shenandoah, Horse Artillery

1st United States Artillery, Batteries A&E

from Department of the Gulf

1st United States Artillery, Battery K

to Army Shenandoah, Horse Artillery

3rd United States Artillery, Batteries L&M

4th United States Artillery, Battery A

5th United States Artillery, Battery I