The United States Army in the Eastern Theater

< to May • June 1861 • to July >

Commanded by Major General Winfield Scott

Department of Washington 
Colonel Joseph K. F. Mansfield 

Department of Pennsylvania
Major General Robert Patterson

Department of Annapolis 
Major General George Cadwallader (to 6/11)
Major General Nathaniel Banks

Department of Virginia
Major General Benjamin F. Butler

Department of Northeastern Virginia
Brigadier General Irvin McDowell

Department of the East (Pre-war)
Major General John E. Wool

Dept. of Washington
Dept. of Pennsylvania
Dept. of Annapolis
Dept. of Virginia

Dept. of N.E. Virginia