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