By June 1940, most of Europe had fallen to the Nazis and Britain stood alone. So, with Winston Churchill in charge, the British bluffed their way out of trouble, drawing on the trickery which had helped them win the First World War. They broadcast outrageous British propaganda on pretend German radio stations, broke secret codes, conjured up phantom armies and fake airfields with model planes, and sent captured spies back to Germany with false intelligence.…