Due to ironclad battleship design in the 1870s and 1880s, Secretary of War William Endicott lobbied for a new system of coastal defense. In 1890, a casemate was added alongside the fort. Technicians in this reinforced bunker could electronically fire off underwater mines strung across the Potomac.
New offensive armament was also installed. New 12-inch mortars were installed at Battery Meigs which could direct a plunging fire at the thinly protected decks of the new warships.
--Brock-Perry
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