U.S. Army

22nd Army Corps, Department of Washington

Major General Samuel Peter Heintzelman

Defences North of the Potomac

Lt. Colonel J. A. Haskins

First Brigade

Colonel A. A. Gibson

Second Brigade

Colonel L. O. Morris

Third Brigade

Colonel W. R. Pease

Defences South of the Potomac

Bde. Gen. G. A. DeRussy

First Brigade

Colonel T. R. Tannatt

Second Brigade

Col. L. W. Wessells

Third Brigade

Colonel H. L. Abbot

Fourth Brigade

Colonel H. H. Hall

King's Division

Bde. Gen. Rufus King

established 7/15

First Brigade

Bde. Gen. Michael Corcoran

District of Alexandria

Brig. Gen. John P. Slough

1st District of Columbia Infantry Regt.

23rd Maine Infantry Regiment

mustered out

153rd New York Infantry Regiment

to District Washington (see above)

Pennsylvania Independent Battery H

Second Brigade, Pa. Reserves

Colonel H. G. Sickel

3rd Pennsylvania Reserves Regiment

4th Pennsylvania Reserves Regiment

7th Pennsylvania Reserves Regiment

8th Pennsylvania Reserves Regiment

District of Washington

Bde. Gen. J. H. Martindale

2nd District of Columbia Infantry Regt.

34th Massachusetts Infantry Regiment

to W. Va., Maryland Heights Div.

39th Massachusetts Infantry Regiment

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

14th New Hampshire Infantry Regiment

153rd New York Infantry Regiment

from District of Alexandria (see above)

178th New York Infantry Regiment

from Defenses S. Potomac, 3rd Bde.

150th Pennsylvania Infantry, Co. K

157th Pennsylvania Infantry (4 cos.)

Light Artillery Camp Camp Berry

Bde. Gen. A. P. Howe

2nd Connecticut Light Battery

from Potomac, Artillery Reserve, 2nd Vol. Bde

1st Delaware Battery

from Dept. Virginia, 7th Corps, 1st Div.

Maryland Battery B

to W. Va., Maryland Heights Div., 2 Bde.

7th Massachusetts Battery

from Dept. Virginia, 7th Corps, 1st Div., 2 Bde.

1st Michigan Artillery, Battery K

1st New York Artillery, Battery F

from 4th Corps Res. Artillery, Yorktown

1st New York Artillery, Battery H

from 4th Corps Res. Artillery, Yorktown

4th New York Independent Battery

from Potomac, Artillery Reserve, 1st Vol. Bde

10th New York Independent Battery

from Potomac, Artillery Reserve, 1st Vol. Bde

12th New York Independent Battery

to Army Potomac, 3rd Corps Artillery

17th New York Independent Battery

to King's Div. Artillery

19th New York Independent Battery

from Dept. Virginia, 7th Corps, 1st Div.

27th New York Independent Battery

to Department Susquehanna, Philadelphia

30th New York Independent Battery

to Department Susquehanna, 1st Div.

32nd New York Independent Battery

to W. Va., Maryland Heights Div., 2nd Bde.

12th Ohio Independent Battery

1st Pennsylvania Artillery, Battery C

to W. Va., Maryland Heights Div., 1st Bde.

1st Pennsylvania Artillery, Battery H

from 4th Corps Res. Artillery, Yorktown

Pennsylvania Independent Battery D

Keystone Pennsylvania Battery

to W. Va., Maryland Heights Div.

1st West Virginia Artillery, Battery A

to W. Va., Maryland Heights Div.

1st West Virginia Artillery, Battery F

from 8th Corps, French's Div.

5th United States Artillery, Battery I

from Army Potomac, 5th Corps Artillery