''Let your plans be dark and impenetrable as night, and when you move, fall like a thunderbolt. " First written during the sixth century BC, The Art of War is one of the oldest works on military strategy. It teaches you how, when battle commences, to think on your feet and catch your enemy off guard. Since its translation from the Chinese, its readers have included prominent statesmen and generals, from Napoleon to MacArthur to Mao Zedong. The lessons it offers still apply today to...