Confederate Commander: BG P.G.T. Beauregard
Army of the Potomac: ~22,000

Confederate Commanders:
1st Brigade BG Milledge Luke Bonham
2nd Brigade BG Richard S. Ewell
3rd Brigade BG David R. Jones
4th Brigade BG James Longstreet
5th Brigade Col. Philip St. George Cocke
6th Brigade Col. Jubal Early
7th Brigade Col. Nathan G. Evans
Reserve Brigade BG Theophilus H. Holmes

Confederate Commander: BG Joesph E. Johnson
Army of the Shenandoah: ~12,000

1st Brigade BG Thomas J. Jackson
2nd Brigade Col. Francis S. Bartow
3rd Brigade BG Barnard E. Bee
4th Brigade BG Edmund Kirby Smith

Union Commander: BG Irvin McDowell
Army of Northeastern Virginia: ~35,000

Union Commanders:
1st Division BG Daniel Tyler
2nd Division Col. David Hunter
3rd Division Col. Samuel P. Heintzelman
4th Division BG Theodore Runyon
5th Division Col. Dixon S. Miles

The Battle of 1st Manassas (1st Bull Run) brought together three armies, two Confederate armies and one Union army. All the armies were basically inexperienced. The major advantage the Confederate forces had is they were able to move the Army of the Shenandoah to Manassas to reinforce B G Beauregard's army along the Bull Run creek. This move took made use of the east/west railroad that allowed for the quick movement of troops from the Shenandoah Valley.

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This is the battle where BG Thomas Jackson earned his nickname "Stonewall."

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This was also one of the first uses of a balloon to perform aerial reconnaissance. The balloon was named "Enterprise" and developed by Prof. Thaddeus S. C. Lowe.

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Union forces achieved early success in this battle crossing Bull Run creek and driving the Confederates back to Henry House Hill. By 4pm the Confederates counterattacked and the Union soldiers began their long retreat to Washington, DC.