U.S. Army

22nd Army Corps, Department of Washington

Major General C. C. Augur

Defences North of the Potomac

Lt. Colonel J. A. Haskins

First Brigade

Colonel W. H. Hayward

Second Brigade

Colonel J.M.C. Markle

Third Brigade

Lt. Colonel J.H. Oberteuffer

Defences South of the Potomac

Bde. Gen. G. A. DeRussy

First Brigade

Colonel J.C. Lee

Second Brigade

Colonel W.S. Irwin

Third Brigade

Col. Alex Piper (to 5/14)

Colonel W.S. Irwin

Fourth Brigade

Major C.C. Meservey

King's Division

Bde. Gen. R. O. Tyler

division discontinued

First Brigade

Colonel A. H. Grimshaw

Independent Cavalry Brigade

Colonel C. R. Lowell, Jr.

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.

Pennsylvania Independent Battery H

St. Mary's District

Colonel A. G. Draper

from Dept. Va. & N.C.

139th Ohio Infantry Regiment

from Ohio

4th Rhode Island Infantry

from Dept. Va. & N.C., St. Mary's District

2nd Wisconsin Battery

from Dept. Va. & N.C., St. Mary's District

District of Washington

Colonel M. N. Wisewell

First Brigade

Colonel M. N. Wisewell

Second Brigade

Colonel W. H. Brownd

150th Pennsylvania Infantry, Co. K

Light Artillery Camp Camp Berry

Bde. Gen. A. P. Howe

3rd Maine Light Artillery

16th Massachusetts Battery

to Defences S. Potomac, 2nd Bde.

6th New York Independent Battery

from Army Potomac, Horse Artillery, 2nd Bde.

10th New York Independent Battery

to 6th New York Independent Battery (above)

17th New York Independent Battery

Pennsylvania Independent Battery C

mustered out

1st United States Artillery, Battery K

from Army Potomac, Horse Artillery, 1st Bde.

4th United States Artillery, Battery A

from Army Potomac, Horse Artillery, 1st Bde.

5th United States Artillery, Battery F

5th United States Artillery, Battery I

5th United States Artillery, Battery L