When Winston Churchill was a boy of sixteen, he already had a vision for his purpose in life. "This country will be subjected somehow to a tremendous invasion . . . I shall be in command of the defences of London . . . it will fall to me to save the Capital, to save the Empire."It was a most unlikely prediction. Perceived as a failure for much of his life, Churchill was the last person anyone would have expected to rise to national prominence as prime minister and influence the fat...