Fortifications

Fort Reynolds was a Union Army redoubt built as part of the defenses of Washington, D.C., in the American Civil War.

The fort was located in Fairlington, Arlington County, Virginia. It was constructed in September 1861 to command the approach to Alexandria by the Four Mile Run valley and was itself protected by nearby Battery Garesche. It had a perimeter of 360 yards (329 m) and emplacements for 12 guns.

The fort was originally called Fort Blenker after Colonel Louis Blenker's brigade stationed nearby. In late 1863, the fort was renamed after Major General John F. Reynolds, who was killed on 1 July at the Battle of Gettysburg in Pennsylvania.  ( Source - Wikipedia )