Army of the Potomac
Major General George McClellan
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.
Dept. of Virginia
Major General John Dix
An area 60 miles around Fortress Monroe
Major General John E. Wool
New Jersey, Pennsylvania, Delaware, the eastern part of Maryland and the Eastern Shore of Virginia.
Army of Virginia
Major General John Pope
Merger of the Mountain Department and the Departments of the Rappahannock and the Shenandoah, each of which became a subordinate corps of the army
Military District of Washington
Brigadier General James S. Wadsworth
District of Columbia, Arlington County in Virginia, and adjacent fortifications