Tags: Weapon.
The BL 15 inch Mark I succeeded the 13.5-inch (340 mm) gun. It was the first British 15 inch (381 mm) gun design and the most widely used and longest lasting of any British designs and arguably the most efficient heavy gun ever developed by the Royal Navy. It was deployed on capital ships from 1915 until 1959 and was a key Royal Navy gun in both World Wars.
