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Al Mamun · Answer 1 · 2018-03-14T03:36:37+0000

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The use of submarines during World War I made difficult for merchants to bring supplies to the Allies.

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Conor Boyd · Answer 2 · 2018-03-17T02:07:04+0000

The use of submarines made attacking or torpedoing ships easily, that made attacking more effective and reduced the chance of home soldiers getting killed.

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