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Beauregard attacked the US left but if failed. McDowell hit the left CSA flank and crossed Bull Run. Union troops pushed toward the CSA rear. CSA BG Thomas Jackson stood firm against the union assault and CSA general Bernard Bee saw him and said "There is Jackson standing like a stonewall. Rally behind the Virginians." Jackson had earned the nickname "Stonewall Jackson" and his men became "the stonewall brigade" The CSA rallied and drove US troops back. McDowell ordered a retreat but the untrained men could not conduct an organized one under fire. US troops crossed Bull Run Creek to go to D.C. and ran into civilians who came out from D.C. to picnic and watch the union victory. Panic broke out and civilians and soldiers became engtangled in traffic jams. McDowell's army fell apart. CSA did not pursue but remained on the field to claim the spoils of war.

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