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Photo: Farragutful, CC BY-SA 3.0 via Wikimedia Commons
Another Civil War fort, also now a park.
Fort Ethan Allen was an earthwork fortification that the Union Army built in 1861 on the property of Gilbert Vanderwerken in Alexandria County, Virginia, as part of the Civil War defenses of Washington. The remains of the fort are now within Arlington County's Fort Ethan Allen Park.
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