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Gasoline rationing was instituted: There was no lack of product from the oil fields, it was simply being torpedoed by U-boats, causing severe shortages along the East Coast.

This major attack in the early stages of the war was an early indication of the Royal Navy’s vulnerability to German U-boats, even in the north of Scotland.

Guy Ritchie’s latest follows a group of British special forces who took on German U-boats during World War II — and helped inspire James Bond.

Within weeks of the war’s outbreak, German U-boats had sunk three British cruisers in the English Channel, sending 1,500 sailors to their deaths.

The Allies banned German possession of U-boats in view of their massive submarine campaign in the war, which had sunk not just Allied but neutral shipping.