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Exercises in anti-submarine warfare had been restricted to one or two destroyers hunting a single submarine whose starting position was known, and working in daylight and calm weather. U-boats could dive far deeper than British or American submarines (over 700 feet (210 m)), well below the 350-foot (110 m) maximum depth charge setting of British depth charges.

Exercises in anti-submarine warfare had been restricted to one or two destroyers hunting a single submarine whose starting position was known, and working in daylight and calm weather. U-boats could dive far deeper than British or American submarines (over 700 feet (210 m)), well below the 350-foot (110 m) maximum depth charge setting of British depth charges.

Name	HMS Laurentic  Type:	Armed Merchant Cruiser Tonnage	18,724 tons (one of the largest ships sunk). Nationality:  British  Fate	Sunk by U-99 (Otto Kretschmer) Complement	417 (49 dead and 368 survivors) History	Completed in November 1927 as steam passenger ship Laurentic for White Star Ltd (Oceanic Steam Navigation Co), Liverpool. 1934 transferred to Cunard White Star Ltd, Liverpool. On 26 Aug, 1939, requisitioned by the Admiralty and converted to the armed merchant cruiser HMS Laurentic

3 Nov the Casanare was hit by 1 torpedo from and sank. Her distress messages brought the armed merchant cruisers HMS Laurentic (F and HMS Patroclus to the scene and the U-boat began a dramatic battle in which both ships were sunk.

As HMS Clare, she was assigned to the 1st Town Flotilla and arrived at Belfast, Northern Ireland, on 26 September 1940. Clare joined Escort Group 7 and escorted transatlantic convoys. On 20 February 1941, she rescued the crew of the sinking British steamship Rigmor.

ASDIC (also known as SONAR) was a central feature of the Battle of the Atlantic. One crucial development was the integration of ASDIC with a plotting table and weapons (depth charges and later Hedgehog) to make an anti-submarine warfare system.

Mansepool (British Steam merchant) - Convoy OB 289: The cargo ship was torpedoed and sunk in the Atlantic Ocean (61°01′N 12°00′W) by U-97 ( Kriegsmarine) with the loss of two of her 41 crew. Survivors were rescued by HMS Petunia ( Royal Navy) and Thomas Holt

Mansepool (British Steam merchant) - Convoy OB The cargo ship was torpedoed and sunk in the Atlantic Ocean by ( Kriegsmarine) with the loss of two of her 41 crew. Survivors were rescued by HMS Petunia ( Royal Navy) and Thomas Holt

Abbotsford (British Steam merchant) - The collier was torpedoed and sunk in the Atlantic Ocean south west of Cornwall by U-14 ( Kriegsmarine with the loss of all 16 crew.

Abbotsford (British Steam merchant) - The collier was torpedoed and sunk in the Atlantic Ocean south west of Cornwall by ( Kriegsmarine with the loss of all 16 crew.

At 09.41 hours on 15 Jan 1942 the unescorted Coimbra (Master John Patrick Barnard) was hit by one G7e torpedo from U-123, which had spotted the lights of the tanker astern while the U-boat was proceeding eastbound following the southern shore of Long Island. The torpedo struck on the starboard side just aft of the superstructure. A huge towering explosion lit up the night sky and the cargo of oil quickly caught fire and spread across the water.

Coimbra (British Steam tanker) - The tanker was torpedoed and sunk in the Atlantic Ocean by ( Kriegsmarine) with the loss of 36 of her 46 crew. Survivors were rescued by USS Rowan and another destroyer (both United States Navy).

The destroyers HMS Burwell and HMCS Niagra and the ASW trawlers HMT Wastwate, Windermere, Kingston Agathe, and Northern Chief participated in removing the German Crew of U-570 and towing the vessel to Iceland.

AUG 27 1941 Coastal Command aircraft captures U-Boat U 570 photographed from one of the circling aircraft as the Anti Submarine Warfare trawler approaches her.

On 12 November 1942 three days of fighting began, in what came to be known as the Naval Battle of Guadalcanal. The battle began with Japanese air attacks on American ships which had just landed reinforcements, including units from the US Army’s Americal Division (learn more here). Over the course of the next three days, the battle would evolve into a monumental engagement between battleships, cruisers, and destroyers in the narrow confines of Iron Bottom Sound.    In this photo, USS…

Naval Battle of Guadalcanal: USS President Jackson maneuvered under Japanese attack, cruiser USS San Francisco at right center, 12 Nov 1942

Russian protected cruiser Aurora, in St. Petersburg. With HIJMS Mikasa, a survivor of the Battle of Tsushima. Aurora would also play a part in starting the Russian Revolution. A ship of decidedly chequered fame.

Russian protected cruiser Aurora, in St. With HIJMS Mikasa, a survivor of the Battle of Tsushima. Aurora would also play a part in starting the Russian Revolution. A ship of decidedly chequered fame.

A depth charge attack under way in the Atlantic, as seen from one of the destroyers supplied to Britain by the USA.

March, 1941 An Allied convoy escort ship drops depth charges over a U-boat!

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