The United States Army in the Eastern Theater
< to May • June 1863 • to July >
Commanded by Major General Henry Halleck
Army of the Potomac
Major General Joseph Hooker (to June 28)
Major General George Meade
Middle Department
Major General Robert Schenck
Department of Virginia
Major General John Dix
Department of Washington
Major General Samuel P. Heintzelman 
Department of the Susquehanna (1)
Major General Darius Couch
Department of West Virginia (2)
Brigadier General Benjamin F. Kelly
(1) Established June 9, consisting of the State of Pennsylvania east of Johnstown and Laurel Hill Mountain
(2) Established June 28, consisting of the new state of West Virginia and Maryland west of the Alleghenies