Army of the Potomac 
Maj. Gen. Ambrose Burnside (until 1/26)
Maj. Gen. Joseph Hooker (after 1/26)
Dept. of Virginia 
Major General John Dix
An area 60 miles around Fortress Monroe
Middle Department 
Major General Robert Schenck
New Jersey, Pennsylvania, Delaware, the eastern part of Maryland and the Eastern Shore of Virginia.
Washington D.C. Defenses 
Major General Samuel P. Heintzelman
District of Columbia, Arlington County in Virginia, and adjacent fortifications
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