Wherever, whenever it came, it must be a surprise. "Surprise," wrote Adolf Hitler's theorist Colonel Hermann Foertsch, "can be effected by deception of the opponent either in time or in direction." Plans must be kept dark as doom. Frederick the Great, who knew his strategy, used to say: "If I thought my coat knew my plans, I would take it off and burn it."
Last week the British seemed to know too much. They knew that hundreds of self-propelled barges, speedboats and other light craft had been concentrated in Stavanger, Bergen, Antwerp, Ostend,...
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