Was Fire Control Tower No. 23 used for spotting submarines?
No, the gun batteries and towers of Fort Miles were designed to destroy German battleships (like the infamous raider, the Graf Spee). Giant underwater nets prevented submarines from entering Delaware Bay. Lurking out in the ocean, submarines were largely invisible from the towers on shore. Instead, it took teams of American aircraft with bombs and naval vessels with sonar and depth charges to track down and destroy the German U-boats.
