The Battle of the Atlantic, the longest continuous military campaign in World War II, ran from 1939 to the defeat of Nazi Germany in 1945, covering a major part of the naval history of World War II. At its core was the Allied naval blockade of Germany, announced the day after the declaration of war, and Germany's subsequent counter-blockade. The campaign peaked from mid-1940 through to the end of 1943.
HMS Hesperus was an H-class destroyer that had originally been ordered by the Brazilian Navy with the name Juruena in the late 1930s, but was purchased by the Royal Navy after the beginning of World War II in September 1939, commissioned in 1940 as HMS Hearty and then quickly renamed as Hesperus.
The Hedgehog was a forward-throwing anti-submarine weapon that was used primarily during the Second World War. The device, which was developed by the Royal Navy, fired up to 24 spigot mortars ahead of a ship when attacking a U-boat. It was deployed on convoy escort warships such as destroyers and corvettes to supplement the depth charges.
Captain Frederic John Walker, was a British Royal Navy officer noted for his exploits during the Second World War. Walker was the most successful anti-submarine warfare commander during the Battle of the Atlantic, and was known popularly as Johnnie Walker.
An anti-submarine weapon (ASW) is any one of a number of devices that are intended to act against a submarine and its crew, to destroy (sink) the vessel or reduce its capability as a weapon of war. In its simplest sense, an anti-submarine weapon is usually a projectile, missile or bomb that is optimized to destroy submarines.
An acoustic torpedo is a torpedo that aims itself by listening for characteristic sounds of its target or by searching for it using sonar. Acoustic torpedoes are usually designed for medium-range use, and often fired from a submarine.
Anti-submarine warfare is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are typically carried out to protect friendly shipping and coastal facilities from submarine attacks and to overcome blockades.
HMS Balfour was a Captain-class frigate of the Royal Navy which served during World War II. She was built as a TE (Buckley) type destroyer escort in the United States and delivered to the Royal Navy under the Lend-Lease arrangement.
ONS 5 was the 5th of the numbered ONS series of Slow trade convoys Outbound from the British Isles to North America. The North Atlantic battle surrounding it in May 1943 is regarded as the turning point of the Battle of the Atlantic in World War II. The battle ebbed and flowed over a period of a week, and involved more than 50 Allied ships and their escorts, and over 30 U-boats. It saw heavy losses on both sides. However it was almost the last Allied convoy to do so, while losses inflicted on attacking U-boats and U-boat groups became a besetting feature of the campaign; As such it is seen as the point when the tactical and strategic advantage passed to the Allies, and ushered in the period known to Nazi Germany's Kriegsmarine as Black May.
HX 112 was a North Atlantic convoy of the HX series which ran during the battle of the Atlantic in the Second World War. It saw the loss of U-boats commanded by two of the Kriegsmarine's most celebrated commanders and propaganda heroes: U-99 under Otto Kretschmer (POW), and U-100 under Joachim Schepke (KIA).
HMS Havelock was an H-class destroyer that had originally been ordered by the Brazilian Navy with the name Jutahy in the late 1930s, but was bought by the Royal Navy after the beginning of the Second World War in September 1939 and later renamed. She participated in the Norwegian Campaign in May 1940 and was assigned to convoy escort and anti-submarine patrols with the Western Approaches Command afterwards. The ship was briefly assigned to Force H in 1941, but her anti-aircraft armament was deemed too weak and she rejoined Western Approaches Command. Havelock became flotilla leader of Escort Group B-5 of the Mid-Ocean Escort Force in early 1942 and continued to escort convoys in the North Atlantic for the next two years. The ship was converted to an escort destroyer and sank one submarine during the war. After the end of the war, she escorted the ships carrying the Norwegian government in exile back to Norway and served as a target ship through mid-1946. Havelock was scrapped beginning in late 1946.
Convoy HG 76 was an Allied convoy of the HG series, during the Second World War. It was notable for the destruction of five German U-boats, although the true total was not known to the British until after the war.
The barrage attack was developed during the Battle of the Atlantic in World War II as an anti-submarine measure.
Donald George Frederick Wyville Macintyre DSO & Two Bars, DSC was a Royal Navy officer during the Second World War and a successful convoy escort commander. Following the war, he was an author of numerous books on British naval history.
HMCS St. Thomas was a Castle-class corvette of the Royal Canadian Navy. She served during the Second World War in the Battle of the Atlantic, taking part in the sinking of the German U-boat U-877 in 1944. Initially ordered by the British Royal Navy as Sandgate Castle, the ship was transferred to Canada before completion. Following the war, the corvette was converted for mercantile use and renamed Camosun III, then Chilcotin and Yukon Star in 1958 before being broken up in Washington in 1974.
HMCS Battleford was a Flower-class corvette of the Royal Canadian Navy launched on 15 April 1940 and commissioned on 31 July 1941 during the Second World War. The corvette served primarily in the Battle of the Atlantic, escorting convoys of merchant ships. After the war she was sold to the Venezuelan Navy and renamed Libertad. Libertad was wrecked on 12 April 1949.
German submarine U-202 was a Type VIIC U-boat of the Kriegsmarine during World War II. The submarine was laid down on 18 March 1940 by the Friedrich Krupp Germaniawerft yard at Kiel as yard number 631, launched on 10 February 1941, and commissioned on 22 March under the command of Kapitänleutnant Hans-Heinz Linder.
Convoy QS 33 was a trade convoy of merchant ships during the Second World War. It was one of the numbered QS Convoys from Québec to Sydney, Nova Scotia. The convoy was attacked in the early months of the Battle of the St. Lawrence, in the St. Lawrence River and Gulf of St. Lawrence, when German U-boats were making ad hoc forays deep into Canadian waters. The convoy was found on 6 September 1942 by U-165, which then destroyed two ships from the convoy while U-517 destroyed three.
The Western Approaches Tactical Unit (WATU) was a unit of the British Royal Navy created in January 1942 to develop and disseminate new tactics to counter German submarine attacks on trans-Atlantic shipping convoys. It was led by Captain Gilbert Roberts and was principally staffed by officers and ratings from the Women's Royal Naval Service (Wrens). Their primary tool for studying U-boat attacks and developing countermeasures was wargames. After the U-boat threat to merchant shipping was defeated, WATU continued to develop anti-submarine tactics for later stages of the war, including Operation Overlord and the Pacific War. WATU trained naval officers in its tactics by hosting week-long training courses in which the students played wargames. WATU formally ceased operations at the end of July 1945.
HMS Snowflake (K211) was a Flower-class corvette that served in the Royal Navy during the Second World War. The ship participated in both the Battle of the Atlantic and the Arctic convoys of World War II.