Fortifications

Fort Berry (1863-1865) - A Union U.S. Civil War Fort first established in 1863 in present day Arlington County, Virginia. Named Fort Berry after Major General Hiram G. Berry, 4th Maine Infantry, who was killed at Chancellorsville 2 May 1863. 

Established in August 1863 as a redoubt with a perimeter of 215 yards and emplacements for 10 guns. Initial armament included two 8-inch howitzers and two 4.5in siege rifles.   Location:  Intersection of 16th and Monroe Street, Arlington County, Virginia.  ( Source - Fortwiki )