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United States Army troops reinforced Fort Monroe, at the mouth of Hampton Roads, on May 22, 1861, and a few days later took possession of the city of Alexandria, near Washington, D.C. On June 3, Virginia volunteers fought a small battle against Ohio and Indiana volunteers in Philippi, in Barbour County. The defeated Virginians fled the scene, earning the engagement the nickname of the Philippi Races. Six days later at Bethel Church, near Newport News in eastern Virginia, another and larger battle took place, and during the remainder of June several other engagements occurred in Virginia.
The first large battle in western Virginia took place on July 11 at Rich Mountain, as the state's defense forces unsuccessfully attempted to secure the northwestern portion of the state from the United States Army. The largest battle during the first months of the war took place on July 21, 1861, the day after the Provisional Confederate Congress first met in the Capitol in Richmond. At the Manassas railroad junction in northeastern Virginia, a large and highly motivated army of Confederates routed a large and poorly organized Union army, which fled back toward Washington, D.C., in a panic. The First Battle of Manassas, also known as the First Battle of Bull Run, demonstrated that the sectional division would not be settled by one quick battlefield victory.