U.S. Army

22nd Army Corps, Department of Washington

Major General C. C. Augur

Defences North of the Potomac

Lt. Colonel J. A. Haskins (to July 8)

Brigadier General Martin D. Hardin

First Brigade

Colonel W. H. Hayward (to 7/6)

Colonel J.M.C. Marble

Second Brigade

Colonel J.M.C. Markle (to 7/6)

Colonel W.H. Hayward

Third Brigade

Lt. Colonel J.H. Oberteuffer

Defences South of the Potomac

Bde. Gen. G. A. DeRussy

First Brigade

Colonel J.C. Lee (to 7/9)

Colonel J.N.G. Whistler

Second Brigade

Colonel W.S. Irwin

Colonel T. Wilhelmn

Third Brigade

Colonel W.S. Irwin (after 7/10)

Fourth Brigade

Major C.C. Meservey

Independent Cavalry Brigade

Colonel C. R. Lowell, Jr.

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

from 2nd Corps, 1st Div., 1st Bde.

Pennsylvania Independent Battery H

St. Mary's District

Colonel A. G. Draper (to 7/2)

Bde. Gen. James Barnes

5th Massachusetts Cavalry Regiment

from Dept. Va. & N.C., 18th Corps, 3 Div.

139th Ohio Infantry Regiment

4th Rhode Island Infantry

to Army Potomac, 9th Corps, 1st Div.

2nd Wisconsin Battery

District of Washington

Colonel M. N. Wisewell

First Brigade

Colonel M. N. Wisewell (to 7/6)

Colonel G. W. Gile

Second Brigade

Colonel W. H. Brownd

150th Pennsylvania Infantry, Co. K

Light Artillery Camp Camp Berry

Bde. Gen. A. P. Howe (to 7/9)

Major J. A. Hall

3rd Maine Light Artillery

to Army of the Potomac, 9th Army Corps

16th Massachusetts Battery

from Defences S. Potomac, 2nd Bde.

6th New York Independent Battery

17th New York Independent Battery

to Dept. Va. & N.C., 18th Corps

1st United States Artillery, Battery K

3rd United States Artillery, Batteries L&M

from Army Potomac, 9th Corps Artillery

4th United States Artillery, Battery A

5th United States Artillery, Battery F

to Dept. Va. & N.C., 18th Corps

5th United States Artillery, Battery I

5th United States Artillery, Battery L

to Dept. W. Virginia, 2nd Cavalry Div.