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Fort Lyon (Virginia)

Fort Lyon
Part of the Civil War defenses of Washington, D.C.
Fairfax County, Virginia, USA
Fort Lyon Diagram.jpg
A diagram of Fort Lyon, indicating cannon, magazine, and bombproof locations as well as the overall shape of the fort.
Coordinates 38°47′38″N 77°04′40″W / 38.79389°N 77.07778°W / 38.79389; -77.07778Coordinates: 38°47′38″N 77°04′40″W / 38.79389°N 77.07778°W / 38.79389; -77.07778
Type Earthwork fort
Site information
Controlled by Union Army
Condition Dismantled
Site history
Built 1861
Built by U.S. Army Corps of Engineers
In use 1861–1865
Materials Earth, timber
Demolished 1865
Battles/wars American Civil War

Fort Lyon (usually Camp Lyon in Northern records) was a timber and earthwork fortification constructed south of Alexandria, Virginia as part of the defenses of Washington, D.C. during the American Civil War. Built in the weeks following the Union defeat at Bull Run, Fort Lyon was situated on Ballenger's Hill south of Hunting Creek, and Cameron Run (which feeds into it), near Mount Eagle (plantation). From its position on one of the highest points south of Alexandria, the fort overlooked Telegraph Road, the Columbia Turnpike, the Orange and Alexandria Railroad, the Little River Turnpike, and the southern approaches to the city of Alexandria, the largest settlement in Union-occupied Northern Virginia.

At present the Huntington Station of the Washington Metro is located next to Fort Lyon's former hilltop site, which is commemorated by a historical marker at the north end of the station lot off King's Highway. Office buildings and parking garages now dominate the site's once wide-open views east over the Potomac River.

Before the outbreak of the 'so-called' Civil War, Alexandria County (renamed Arlington County in 1920), the Virginia county closest to Washington, D.C., was a predominantly rural area. For a time, part of the District of Columbia, the land now comprising the county was retroceded to Virginia in a July 9, 1846 act of Congress that took effect in 1847. Most of the county is hilly, and at the time, most of the county's population was concentrated in the city of Alexandria, at the far southeastern corner of the county. In 1861, the rest of the county largely consisted of scattered farms, the occasional house, fields for grazing livestock, and Arlington House, owned by Mary Custis, wife of Robert E. Lee.


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