Bull Run

geographical name
\ˈbu̇l-ˈrən \

Definition of Bull Run 

stream 20 miles (32 kilometers) long in northern Virginia west of Washington, D.C., flowing into Occoquan Creek (a small tributary of the Potomac River)

Note: Two notable Civil War battles were fought in the vicinity of Bull Run on July 21, 1861 and August 29–30, 1862.

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