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Commanded by Major General Irvin McDowell

First Division Brigadier General W. B. Franklin
1st Brigade Brig. Gen. P. Kearney to 1 Div. 6 Corps, 
Army of the Potomac
2nd Brigade Brig. Gen. H. W. Slocum
3rd Brigade Brig. Gen. J. Newton
Second Division Brigadier General George McCall
1st Brigade Brig. Gen. John F. Reynolds
2nd Brigade Brig. Gen. George Meade
3rd Brigade Brig. Gen. Edward O. C. Ord
Third Division Brigadier General Rufus King
1st Brigade Brig. Gen. C. C. Augur
2nd Brigade Brig. Gen. Marsena Patrick
3rd Brigade Colonel Lysander Cutler
Ord’s Division Brigadier General Edward O. C. Ord
1st Brigade Brig. Gen. J. B. Ricketts  from Defenses of Washington
2nd Brigade Brig. Gen. Abram Duryea
3rd Brigade Brig. Gen. G. L. Hartsuff
Shields’ Division Brigadier General James Shields
1st Brigade Brig. Gen. Nathan Kimball  from Dept. Shenandoah,
2nd Div.
2nd Brigade Brig. Gen. O. S. Ferry
3rd Brigade Brig. Gen. Erastus B. Tyler
4th Brigade Brig. Gen. Samuel S. Carroll
Doubleday’s Brigade Brigadier General Abner Doubleday
76th New York Infantry Regiment Colonel Nelson W. Green  from Wadsworth’s Command, Military District of Washington
95th New York Infantry Regiment Colonel George H. Biddle
56th Pennsylvania Infantry Regiment Colonel Sullivan A. Meredith
Geary’s Brigade Brigadier General John W. Geary
28th Pennsylvania Infantry Regiment from Dept. Shenandoah
3rd Indiana Cavalry Regiment from Middle Dept.
1st West Virginia Cavalry from Dept. Shenandoah
Pennsylvania Independent Battery E from Dept. Shenandoah
Bayard’s Cavalry Brigade Brigadier General George D. Bayard
1st Maine Cavalry (7 cos.) Lt. Colonel Calvin R. Douty from Dept. Shenandoah, Hatch’s Cav.
1st New Jersey Cavalry Regiment Colonel Andrew T. McReynolds from Mil. Dist. Washington
1st Pennsylvania Cavalry Colonel Owen Jones from Potomac, 1 Corps
1st Pennsylvania Rifle Battalion Lt. Colonel Thomas L. Kane from McCall’s Div. 
Military District of Washington Brig. Gen. James Wadsworth