Britain's Convoys, Germany's U-Boats

Germany was able to inflict huge losses on Britain during the Battle of the Atlantic. The British organised merchant ships into trans-Atlantic convoys, but between 1940-41 the German U-Boat wolf packs sank millions of tonnes of shipping. The initial successes were gradually replaced with ever greater losses for Germany, as inadequate U-Boats (too small and too few), were met with improving intelligence and technology on the part of Britain and the USA.

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