Fort DuPont, named in honor of Rear Admiral Samuel Francis Du Pont, is located between Delaware City and the modern Chesapeake and Delaware Canal on the original Reeden Point tract, which was granted to Henry Ward in 1675. The first fortification built was the Ten Gun Battery, an auxiliary to nearby Fort Delaware during the American Civil War. A twenty-gun battery was constructed on the reservation during the 1870s followed by a mine control casemate in 1892. In 1897-1905, Endicott Era emplacements were constructed for long-range rifles, mortars, and rapid-fire guns. In 1922, the post became headquarters for the 1st Engineer Regiment, which garrisoned the post until 1941. During World War II, Fort DuPont served as a mobilization station for deploying units, and contained a prisoner-of-war