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Commanded by Major General John Pope
First Corps |
Major General Franz Siegel | |
| First Division | Brigadier General Robert Schenck (w 8/30) Brigadier General Julius Stahel |
|
| Second Division | Brigadier General A. Von Steinwehr | |
| Third Division | Brigadier General Carl Schurz | |
| Milroy’s Independent Brigade | Brigadier General R. Milroy | |
| Cavalry Brigade | Colonel John Beardsley | |
Second Corps |
Major General Nathaniel P. Banks | |
| First Division | Brigadier General Alpheus Williams | |
| Second Division | Brigadier General C. C. Augur (to 8/9) Brigadier General Henry Prince (c 8/9) Brigadier General George S. Greene |
|
| Cavalry Brigade | Brigadier General John Buford | |
Third Corps |
Major General Irvin McDowell | |
| First Division | Brigadier General Rufus King (to 8/28) Brigadier General J. F. Hatch (8/28 – 8/30) Brigadier General Abner Doubleday |
|
| Second Division | Brigadier General John B. Ricketts | |
| Third Division | Brigadier General John F. Reynolds | from Army Potomac, 5 Corps, 8/25 |