The Harbor Defenses of the Delaware was a United States Army Coast Artillery Corps harbor defense command. It coordinated the coast defenses of the Delaware River estuary from 1897 to 1950, beginning
Fort Delaware on Pea Patch Island
Historical marker for the Grand Battery (or the Association Battery), Pennsylvania's largest early fortification, originally built in 1748
Plan of Ft. Mifflin in 1777
Overlay of the three versions of Fort Delaware. The largest is Delafield's never-built design; the irregular pentagon is the fort that exists today. Drawn by Lt. Montgomery C. Meigs.
Fort Miles
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Fort Miles was a United States Army World War II installation located on Cape Henlopen near Lewes, Delaware. Although funds to build the fort were approved in 1934, it was 1938 before construction beg
View of Fort Miles from Tower 7, which was one of the many fire control towers.
Restored World War II observation tower.
12-inch (305 mm) gun at Battery 519.
16-inch (406 mm) gun at Fort Miles in 2015.