The United States Army in the Eastern Theater


< to July • August 1861 • to September >

Commanded by Major General Winfield Scott


Department of Pennsylvania
Major General John A. Dix
Merged into Department of the Potomac 8/24

Department of Virginia
Major General Benjamin F. Butler (until 8/17)
Major General John E. Wool

Department of Northeastern Virginia
Brigadier General Irvin McDowell

Discontinued and merged into the Department of the Potomac 8/17

Military District of the Potomac
Redesignated Department or Army of the Potomac August 15
Major General George B. McClellan
Combined with the Department of the Shenandoah 8/17 and Pennsylvania 8/24

Department of the Shenandoah 
Major General Nathaniel P. Banks
Merged into Department of the Potomac 8/17

Department of the East 
Major General John E. Wool
Abolished 8/17

Dept. of Pennsylvania
Dept. of Virginia

Department of the Shenandoah

Army of the Potomac

Department of Northeastern Virginia

The United States Army in the Eastern Theater, August 1861