Department of the East
Major General John E. Wool
All of the United States east of the Mississippi not in other departments.
Dept. of Washington
Brigadier General Joseph K. F. Mansfield
Prince George, Montgomery, and Frederick Counties added; merged into the Military District of the Potomac 7/25.
Dept. of Pennsylvania
Major General Robert Patterson (to 7/27)
Major General John A. Dix (after 7/27)
Pennsylvania, Delaware, and Maryland not in the Depts. of Washington & Shenandoah.
Dept. of Annapolis
Renamed Dept. of Maryland 7/19.
Major General John A. Dix (7/19 -7/25)
Merged into Dept. of Pennsylvania 7/25.
Dept. of Virginia
Brigadier General Benjamin F. Butler
An area 60 miles around Fortress Monroe
Dept. of N.E. Virginia
Brigadier General Irvin McDowell
Merged into the Military District of the Potomac 7/25.
Dept. of the Shenandoah (est. 7/19)
Major General Nathaniel P. Banks
The Valley of Virginia, and Washington
& Allegheny Counties in Maryland