The United States Army in the Eastern Theater
< to June • July 1863 • to August >
Commanded by Major General Henry Halleck

| Army of the Potomac Major General George Meade |
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| Middle Department Major General Robert Schenck |
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| Department of Virginia Major General John Dix Merged into Department of Virginia & North Carolina (established 7/15) Brigadier General George W. Getty (to 7/20) Major General J. G. Foster |
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| Department of Washington Major General Samuel P. Heintzelman |
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| Department of the Susquehanna Major General Darius Couch |
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| Department of West Virginia Brigadier General Benjamin F. Kelly |
