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Commanded by Major General John Pope

First Corps Major General Franz Siegel (except 7/7 – 7/12)
Brigadier General Robert C. Schenck (7/7 – 7/12)
First Division Brig. Gen. Robert C. Schenck
Second Division Brig. Gen. A. Von Steinwehr
Third Division Brig. Gen. Carl Schurz
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 (to 7/7)
Brigadier General C. C. Augur
Cavalry Brigade Brig. Gen. J. P. Hatch (to 7/27)
Brig. Gen. John Buford
Third Corps Major General Irvin McDowell
First Division Brig. Gen. Rufus King
Second Division Brig. Gen. John B. Ricketts
Cavalry Brigade Brig. Gen. George Bayard