First Battle of Bull Run order of battle: Union

The following units and commanders fought in the First Battle of Bull Run on the Union side. The Confederate order of battle is shown separately. Order of battle compiled from the army organization during the battle and the reports.

Military rank

 * BG = Brigadier General
 * Col = Colonel
 * Ltc = Lieutenant Colonel
 * Maj = Major
 * Cpt = Captain
 * Lt = Lieutenant

Other

 * w = wounded
 * mw = mortally wounded
 * k = killed
 * c = captured

Army of Northeastern Virginia
BG Irvin McDowell, Commanding

General Staff:
 * Chief of Artillery: Maj William F. Barry
 * Chief Engineer: Maj John G. Barnard
 * Chief Quartermaster: Cpt Otis H. Tillinghast (mw)