U.S. Army

Department of Annapolis (to July 19)
Department of Maryland (July 19 - 25)

Major General Nathaniel P. Banks (until July 19)
Major General John A. Dix (after 7/19)

On July 19 the Department's name was changed to the Department of Maryland, and on July 25 it was merged into the Department of Pennsylvania, the forces becoming Dix's Division.

Infantry

6th Massachusetts Infantry Regiment

Coloenel Edward F. Jones

returned to Massachusetts to muster out 7/29

6th New York Militia Regiment

Colonel Joseph Pinckney

13th New York State Militia

Colonel Abel Smith

20th New York State Militia

Colonel George W. Pratt

1st Pennsylvania Reserves

Colonel R. Biddle Roberts

from Harrisburg 7/22

12th Pennsylvania Infantry Regiment

Colonel David Campbell

to Dix's Division, Baltimore 7/25

18th Pennsylvania Infantry Regiment

Colonel William D. Lewis

to Dix's Division, Baltimore 7/25

19th Pennsylvania Infantry Regiment

Colonel Peter Lyle

to Dix's Division, Baltimore 7/25

22nd Pennsylvania Infantry Regiment

Colonel Turner G. Morehead

to Dix's Division, Baltimore 7/25

Artillery

Cook's Boston, Ma. Battery

2nd United States Artillery, Battery I