For more than two thousand years, Sun-Tzu's The Art of War has provided leaders with profound insights into the use of skill, tactics, psychology and discipline to outwit opponents. Said to have inspired Napoleon, and used by Mao Zedong and general Douglas Macarthur, as well as many famous business gurus, politicians and sport starts, its ancient words of wisdom provide a touchstone for today's managers and executives fighting their own boardroom battles.