Union Army of the West (5,600 men)
Commander: Brigadier General Nathaniel Lyon
Led by newly promoted Brigadier General Nathaniel Lyon, the Federal forces were a combination of regular United States Army and volunteers from Missouri, Kansas and Iowa.
1st Brigade (884) Major Samuel D. Sturgis
- 1st U.S. Infantry, Captain Joseph B. Plummer (4 companies, 300 men)
- 2d Missouri Infantry Battalion, Major Peter J. Osterhaus (150)
- Company I, 2d Kansas Mounted Infantry, and Company D, 1st U.S. Cavalry (350)
- Company F, 2d U.S. Artillery, Captain James Totten (6 guns, 84 men)
2nd Brigade (1,200) Colonel Franz Sigel
- 3d Missouri Infantry, Lt. Colonel Anselm Albert, and 5th Missouri Infantry, Colonel Charles E. Salomon (990)
- Company I, 1st U.S. Cavalry, Captain Eugene A. Carr (65)
- Company C, 2d U.S. Dragoons, 2d Lt, Charles E. Farrand (60)
- Backof's Battery, Lieutenants Edward Schuetzenbach and Frederick Schaeffer (6 guns, 85 men)
3rd Brigade (1,116) Lt. Colonel George L. Andrews
- 1st Missouri Infantry, Lt. Colonel George L. Andrews (775)
- 2d U.S. Infantry, Captain Frederick Steele (4 companies, 275 men)
- Du Bois' Battery, 2d Lt. John V. Du Bois (4 guns, 66 men)
4th Brigade (2,400) Colonel George W. Deitzler
- 1st Kansas Infantry, Colonel George W. Deitzler (800)
- 2d Kansas Infantry, Lt. Colonel Charles W. Blair (600)
- 1st Iowa Infantry, Colonel John F. Bates (800)
- Home Guards, Captain Clark Wright (200)
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