Bittern-class sloop
The "Bittern"-class sloop was a three-ship class of long-range escort vessels used in the Second World War by the Royal Navy. Design. The "Bittern" class were built as light, long-range escort ships with limited anti-air capability. They were fitted with Denny-Brown fin stabilisers and a HACS fire control system. Three ships were built: (originally called "Bittern", but renamed before launching in 1934), and . "Enchantress" was the first in the class, and was built as an armed Admiral's yacht. The armament was two single 4.7-inch guns forward and four 3-pounder  saluting guns. Anti-aircraft armament was installed at the outbreak of war, however the aft turret, originally replaced with accommodation, was never installed. "Stork" was unarmed on completion, but with provision for six 4-inch guns, plus AA and ASW weaponry; she served as a survey vessel in the Far East. Her main armament was added at the outbreak of war. "Bittern" completed as designed, with the same armament as "Stork" The design served as the basis for the and s. Service history. "Enchantress" served as convoy escort throughout the war, and was credited with the destruction of an Italian  submarine. She survived the war and was sold into civilian service in 1946, being renamed "Lady Enchantress". She was broken up in 1952. "Stork" was completed as an unarmed survey vessel, and was only armed after the outbreak of war. She also served as a convoy escort, and was senior ship in 36th Escort Group under Cdr. FJ Walker. She was credited with the destruction of four U-boats. "Stork" remained in service until being broken up in 1958. The third ship in the class was launched as "Bittern", and completed as designed. She was involved in the Norwegian campaign , but was lost to air attacks at Namsos in 1940.