Army of the Potomac
Major General George McClellan
Operating in the Department of Virginia, but separate from General Wool's command.
Dept. of Virginia 
Major General John Dix
An area 60 miles around Fortress Monroe
Middle Department 
Major General John E. Wool
New Jersey, Pennsylvania, Delaware, the eastern part of Maryland and the Eastern Shore of Virginia.
Army of Virginia 
Major General John Pope
Merger of the Mountain Department and the Departments of the Rappahannock and the Shenandoah, each of which became a subordinate corps of the army
Military District of Washington 
Brigadier General James S. Wadsworth
District of Columbia, Arlington County in Virginia, and adjacent fortifications
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