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German U (unterseeboot) boats were submarines and they sank allied shipping. Britain depended on the supply of resources across the Atlantic, and Germany almost cut it off, although the US assisted with escort ships and the UK increased armament and changes convoy tactics to have any chance against the German wolf packs.

What finally changed the odds was that British code breakers decrypted the German Engima system and could get intelligence about U-boat movements and plans.

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13y ago

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