McDowell gathered his forces here, July 18, 1861, to attack Beauregard, who lay west of Bull Run. From here a part of the Union army moved north to cross Bull Run and turn the Confederate left wing, July 21, 1861. This movement brought on the battle.
Geographic Location: Fairfax County
Physical Description of Location: Marker is on grounds of Centreville public library. Southwest corner of intersection of Machen Road and Lee Highway (Route 29), Centreville, VA 20121. Marker is not visible from Route 29. Park in library parking lot and walk to access marker.
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