Strength figures vary by source. Eicher, pp. 87–88: 35,000 Union, 32,000 Confederate; Esposito, map 19: 35,000 Union, 29,000 Confederate; BallardArchived January 1, 2009, at the Wayback Machine, 35,000 Union (18,000 engaged), 34,000 Confederate (18,000 engaged); Salmon, p. 20: 28,450 Union, 32,230 Confederate; Kennedy, p. 14: 35,000 Union, 33,000 Confederate; Livermore, p. 77: 28,452 Union "effectives", 32,323 Confederate engaged. Writing in The Century Magazine, adjutant generals James B. FrycitesArchived May 9, 2008, at the Wayback Machine 18,572 Union men (including stragglers not on the field) and 24 guns engaged, Thomas JordancitesArchived August 29, 2009, at the Wayback Machine 18,052 Confederate men and 37 guns engaged.
Further information:Abtract from returns of the Department of Northeastern Virginia, commanded by Brigadier-General McDowell, U.S.A., for July 16 and 17, 1861 (Official Records, Series I, Volume II p. 309Archived March 17, 2017, at the Wayback Machine).
Further information:Casualties at the battle of Bull Run, July 21, 1861. (Official Records, Series I, Volume II p. 327Archived March 17, 2017, at the Wayback Machine).
Further information:Casualties in the Army of the Potomac (Confederate) July 21, 1861. (Official Records, Series I, Volume II p. 570Archived March 17, 2017, at the Wayback Machine).
Strength figures vary by source. Eicher, pp. 87–88: 35,000 Union, 32,000 Confederate; Esposito, map 19: 35,000 Union, 29,000 Confederate; BallardArchived January 1, 2009, at the Wayback Machine, 35,000 Union (18,000 engaged), 34,000 Confederate (18,000 engaged); Salmon, p. 20: 28,450 Union, 32,230 Confederate; Kennedy, p. 14: 35,000 Union, 33,000 Confederate; Livermore, p. 77: 28,452 Union "effectives", 32,323 Confederate engaged. Writing in The Century Magazine, adjutant generals James B. FrycitesArchived May 9, 2008, at the Wayback Machine 18,572 Union men (including stragglers not on the field) and 24 guns engaged, Thomas JordancitesArchived August 29, 2009, at the Wayback Machine 18,052 Confederate men and 37 guns engaged.
Further information:Abtract from returns of the Department of Northeastern Virginia, commanded by Brigadier-General McDowell, U.S.A., for July 16 and 17, 1861 (Official Records, Series I, Volume II p. 309Archived March 17, 2017, at the Wayback Machine).
Strength figures vary by source. Eicher, pp. 87–88: 35,000 Union, 32,000 Confederate; Esposito, map 19: 35,000 Union, 29,000 Confederate; BallardArchived January 1, 2009, at the Wayback Machine, 35,000 Union (18,000 engaged), 34,000 Confederate (18,000 engaged); Salmon, p. 20: 28,450 Union, 32,230 Confederate; Kennedy, p. 14: 35,000 Union, 33,000 Confederate; Livermore, p. 77: 28,452 Union "effectives", 32,323 Confederate engaged. Writing in The Century Magazine, adjutant generals James B. FrycitesArchived May 9, 2008, at the Wayback Machine 18,572 Union men (including stragglers not on the field) and 24 guns engaged, Thomas JordancitesArchived August 29, 2009, at the Wayback Machine 18,052 Confederate men and 37 guns engaged.
Further information:Casualties at the battle of Bull Run, July 21, 1861. (Official Records, Series I, Volume II p. 327Archived March 17, 2017, at the Wayback Machine).
Further information:Casualties in the Army of the Potomac (Confederate) July 21, 1861. (Official Records, Series I, Volume II p. 570Archived March 17, 2017, at the Wayback Machine).