The British L-class submarine is an improved version of a submarine that served throughout which war ?
British L-class submarine The British L-class submarine was originally planned under the emergency war programme as an improved version of the British E-class submarine. The scale of change allowed the L class to become a separate class.
BL 7.5-inch naval howitzer The BL 7.5-inch howitzer (naval) was a British anti-submarine mortar developed during World War I.