The United States Army in the Eastern Theater
< to May • June 1863 • to July >
Commanded by Major General Henry Halleck
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Army of the Potomac
Middle Department
Department of Virginia Department of Washington
Department of West Virginia (2)
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Department of the Susquehanna (1)
(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