Thanks to its key strategic location across the Potomac from the District, Arlington County was home to 22 Union forts during the Civil War. In order to see an approaching enemy, soldiers often cut down 1-2 miles of trees around each fort.
The photo, left, illustrates just that. Fort C.F. Smith, now a county park along the George Washington Parkway in North Arlington, was surrounded by a denuded landscape that allowed soldiers to mount an effective, fortified defense against any Confederate force that might have tried to invade attack Washington.