Merchant ships plough through the North Atlantic en route to Britain. The convoy system was the linchpin of the Allies' long and hard-fought victory over Germany's U-boats in the Battle of the Atlantic.
'Merchant ships en route to Britain', URL: https://nzhistory.govt.nz/media/photo/merchant-ships-en-route-to-britain, (Ministry for Culture and Heritage), updated 13-May-2013
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