Army of the Potomac
Major General George McClellan
The main body of the Army of the Potomac moved to the Virginia Penninsula in March and was operating in the Department of Virginia, but it remained separate from General Wool's command.
Dept. of Virginia
Major General John E. Wool
An area 60 miles around Fortress Monroe
Middle Department (est. 3/22)
Major General John Dix
New Jersey, Pennsylvania, Delaware and the Eastern Shore of Maryland and Virginia and the counties of Cecil, Hartford, Baltimore and Ann Arundel in Maryland.