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 In the movie Greyhound, a 2020 American war film directed by Aaron Schneider. The plot follows a US navy commander Starring Tom Hanks defending a merchant ship convoy under the attack by U-boats which were deployed by the German Kriegsmarine into the Atlantic to enforce a naval blockade, disrupting convoys of supply ships between North American and Britain during the 2nd world war. Many of these U-boats have indeed achieved considerable success during that time.
 During World War II, U-boat warfare was the major component of the Battle of the Atlantic, which began in 1939 and ended with Germany's surrender in 1945. The Armistice of 11 November 1918 ending World War I had scuttled most of the old Imperial German Navy and the subsequent Treaty of Versailles of 1919 limited the surface navy of Germany's new Weimar Republic to only six battleships (of less than 10,000 tons each), six cruisers, and 12 destroyers. To compensate, Germany's new navy, the Kriegsmarine, developed the largest submarine fleet going into World War II. British Prime Minister Winston Churchill later wrote "The only thing that really frightened me during the war was the U-boat peril."
 In the early stages of the war the U-boats were extremely effective in destroying Allied shipping due to the large gap in mid-Atlantic air cover. Cross-Atlantic trade in war supplies and food was extensive and critical for Britain's survival. The continuous action surrounding British shipping became known as the Battle of the Atlantic, as the British developed technical defences such as ASDIC and radar, and the German U-boats responded by hunting in what were called "wolfpacks" where multiple submarines would stay close together, making it easier for them to sink a specific target. Britain's vulnerable shipping situation existed until 1942, when the tides changed as the U.S. merchant marine and Navy entered the war, drastically increasing the amount of tonnage of supplies sent across the Atlantic. The combination of increased tonnage and increased naval protection of shipping convoys made it much more difficult for U-boats to make a significant dent in British shipping. Once the United States entered the war, U-boats ranged from the Atlantic coast of the United States and Canada to the Gulf of Mexico, and from the Arctic to the west and southern African coasts and even as far east as Penang. The U.S. military engaged in various tactics against German incursions in the Americas; these included military surveillance of foreign nations in Latin America, particularly in the Caribbean, to deter any local governments from supplying German U-boats.
 Anyway, enjoy watching the 10 Most successful Uboats of world war II (Top 10 U-boats based on total tonnage)
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https://photos.usni.org/content/4430766png
https://www.naval-encyclopedia.com/
https://www.the-blueprints.com/
http://www.wardrawings.be/

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