Union

Army of Northeastern Virginia: Brigadier General Irvin McDowell

First Division: Brigadier General Daniel Tyler

First Brigade: Colonel Erasmus Keyes - 223
Second Brigade: Brigadier General Robert Schneck - 98
Third Brigade: Colonel William Sherman - 605
Fourth Brigade: Colonel Isreal Richardson - ---
TOTAL - 929

Second Division: Colonel David Hunter

First Brigade: Colonel Andrew Porter - 464
Second Brigade: Colonel Ambrose Burnside - 363
TOTAL - 829

Third Division: Colonel Samuel Heintzelman

First Brigade: Colonel William Franklin - 359
Second Brigade: Colonel Orlando Willcox - 432
Third Brigade: Colonel Oliver Howard - 225
TOTAL - 1, 016

Fifth Division: Colonel Dixon Miles

First Brigade: Colonel Louis Blenker - 118
Second Brigade: Colonel Thomas Davies - 3
TOTAL - 121

GRAND TOTAL - 2,896

Confederate