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The United States Army in the Eastern Theater

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< to August • September 1862 • to October >

Commanded by Major General Henry Halleck

Army of the Potomac
Major General George B. McClellan

Army of Virginia 
Major General John Pope
Pope’s beaten Army of Virginia withdrew into the defenses of Washington and merged with the Army of the Potomac under McClellan’s command. Pope requested to be relieved on September 3 and was transferred back to the Western Theater.

Department of Virginia
Major General John Dix 

Middle Department
Major General John E. Wool

Military Dist. of Washington  – (abolished 9/2)
Brigadier General James S. Wadsworth

Washington D.C. Defenses
Major General Nathaniel Banks
Established 9/7, consisting of the District of Columbia, Arlington County in Virginia, and adjacent fortifications