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Well during World War 1 submarines were used just for war to attack enemies but then it changed the war because it was easier to attack many enemies from under water but Germany sank many ships.

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In the World War 1 submarines and U-boats were mostly used to keep weapons in there and so they can take any kinds of troops to different varieties of places to keep troops from taking a long time. Also they used it to attack many countries that were being attacked from other countries. Also since World War 1 was a very dangerous conflicts on history, they were very dangerous because 5,100 German submarines were killed between 1914 and 1918.

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Germany used Submarines/U-boats because it provided tremendous stealth, they would stay submerged rill they found a target. When Britain began arming merchant ships so Germany started to fire without warning.

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The submarines/U-Boats where first made in military bases which caused the U-boats from the Germany to attack or get at them and they sank a big submarine that was unrestricted which caused submarine warfare.

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on January 31 1917  Germany announced the renewal of unrestricted submarine warfare. It also started when a french passenger ship was attacked by a German U-Boat so the entire front of the boat was blown off and more than 50 lives were lost.

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Well there was this thing called Submarine Warfare and when it was time for War all huge ships or submarines many from different countries would be attacked just by the Germans.

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Germans where the ones to use the Submarines/U-boats during WWI.