June 1862 • to July >
Commanded by Major General John Pope
Created June 26, 1862 from the Department of the Shenandoah, Department of the Rappahannock, Mountain Department, and Sturgis’ Division of the Military District of Washington
| First Corps | Major General John C. Fremont (6/26 – 6/28) Brigadier General Robert C. Schenck (6/28 – 6/30) Major General Franz Siegel (after 6/30) |
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| First Division | Brig. Gen. Robert C. Schenck | |
| Second Division | Brig. Gen. A. Von Steinwehr | |
| Third Division | Brig. Gen. Carl Schurz | from Mountain Department |
| Milroy’s Independent Brigade | Brig. Gen. R. Milroy | |
| Cavalry Brigade | Colonel John Beardsley | |
| Second Corps | Major General Nathaniel P. Banks | |
| First Division | Brig. Gen. Alpheus Williams | |
| Second Division | Brig. Gen. James Cooper | from Dept. Shenandoah |
| Cavalry Brigade | Brig. Gen. John P. Hatch | |
| Third Corps | Major General Irvin McDowell | |
| First Division | Brig. Gen. Rufus King | from Dept. Rappahannock |
| Second Division | Brig. Gen. John B. Ricketts | |
| Cavalry Brigade | Brig. Gen. George D. Bayard | |