The United States Army in the Eastern Theater
< to February • March 1862 • to April >
Commanded by Major General George B. McClellan
Army of the Potomac
Major General George B. McClellan
Department of Virginia
Major General John E. Wool
Mountain Department (established March 11 from the Department of Western Virginia)
Brigadier General William S. Rosecrans (to March 29)
Major General John C. Fremont
Middle Department (established March 22)
Major General John Dix
Consisting of New Jersey, Pennsylvania, Delaware and the Eastern Shore of Maryland and Virginia and the counties of Cecil, Hartford, Baltimore and Ann Arundel in Maryland.
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