The following Union Army units and commanders fought in the Second Battle of Bull Run, also known as the Second Battle of Manassas, of the American Civil War.
The Confederate order of battle is listed separately.
[4] MG John Pope[5] Chief of Staff: Col George D. Ruggles Chief of Artillery: Cpt Alexander Piper Chief of Cavalry: BG Washington L. Elliott (w) Headquarters Escort: MG Franz Sigel (w) Chief of Artillery: Cpt Ulric Dahlgren Headquarters Escort: First Division
Col Nathaniel C. McLean Second Division
BG Adolph von Steinwehr
Ltc Gustavus A. Muhleck Third Division
Col Wlodzimierz Krzyzanowski Reporting directly
BG John Buford[10] (w) MG Irvin McDowell Chief of Staff: Col Edmund Schriver Chief of Artillery: Maj Davis Tillson Headquarters Troops: First Division
BG John Gibbon Second Division
Col Joseph Thoburn (w) Pennsylvania Reserves[14]
Cpt Dunbar R. Ransom Reporting directly
MG Samuel P. Heintzelman First Division
Col Joseph B. Carr MG Fitz John Porter Chief of Staff: Ltc Frederick T. Locke First Division
Cpt Stephen H. Weed MG Jesse L. Reno First Division