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Commanded by Brigadier General Jacob D. Cox

The Mountain Department was absorbed into Major General John Pope’s Army of Virginia on June 26.

1st Brigade Colonel Eliakim Scammon
12th Ohio Infantry Regiment Colonel Carr B. White
23rd Ohio Infantry Regiment Lt. Colonel Rutherford B. Hayes
30th Ohio Infantry Regiment Colonel Hugh Ewing
1st Ohio Independent Battery
2nd Brigade Colonel August Moor
28th Ohio Infantry Regiment Lt. Colonel Godfried Becker
34th Ohio Infantry Regiment Colonel John T. Toland
37th Ohio Infantry Regiment Colonel Edward Siber
Simmond’s Kentucky Battery
3rd Brigade Colonel George Crook
11th Ohio Infantry Regiment Colonel Augustus H. Coleman
36th Ohio Infantry Regiment Lt. Colonel Melvin Clarke
44th Ohio Infantry Regiment Colonel Samuel A. Gilbert
47th Ohio Infantry Regiment Colonel Frederick A. Poschner
4th Brigade Colonel Joseph A.J. Lightburn
4th West Virginia Infantry Regiment Colonel Joseph A.J. Lightburn
9th West Virginia Infantry Regiment Colonel Leonard Skinner
1st West Virginia Cavalry (det)
Schambeck’s Illinois Cavalry Co.
Unattached
2nd West Virginia Cavalry Regiment Colonel William M. Bolles (res. 6/25)
3rd Independent Ohio Cavalry Co.