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The wolfpack tactic was made famous by Admiral Karl Donitz, Hitler's  mastermind of submariners. His strategy: to send teams of U-boats to  bear against the convoys of ships heading from Canada to Britain, cut  maritime lifelines, and starve the enemy into defeat. Take a deep dive  into the North Atlantic as we go above and below sea level to relive one  of the first attacks of Donitz's lethal subs in 1940, headed by leader  of the pack Commander Otto Kretschmer. Then follow Britain's war  strategists as they race to combat this new deadly attack.