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In page Second Battle of Bull Run:

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During the first two hours of the Confederate assault, McDowell had constructed a new line of defense consisting of Reynolds' and Sykes' divisions. Longstreet's last fresh troops, Richard Anderson's division now took the offensive. The regulars of George Sykes's division along with Meade and Seymour's brigades, plus Piatt's brigade, formed a line on Henry House Hill that held off this final Confederate attack long enough to give the rest of the army time to withdraw across Bull Run Creek to Centreville.[citation needed]