The truth was, Sir Charles Little told Roberts, that German U-boat losses had been gravely exaggerated, and Allied convoy losses equally downplayed. Next Little offered a glimmer of hope. Britain’s fortunes in the Atlantic, he said, were poised to change. The capture in May 1941 of an Enigma machine–one of the contraptions used by the Nazis to encode their communications–had hastened the breaking of the code that underpinned the cryptic messages that passed between U-boats at sea and Doenitz at his headquarters. Messages intercepted by Wrens in Scarborough were passed to Bletchley Park. There
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