United States Armies and Departments
in the Eastern Theater of the Civil War
April 1863

Army of the Potomac

Major General Joseph Hooker

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.

Dept. of Washington

Major General Samuel P. Heintzelman

District of Columbia, Arlington County in Virginia, and adjacent fortifications