In the year 216 B.C., Hannibal of Carthage, faced with an opposing Roman army twice the size of his own, outwitted the enemy at Cannae by means of a strategy which has become a classic of its kind. As a result of his famous "double pincer" maneuver, 70,000 Roman soldiers died within the space of a few hours on a field the size of New York's Central Park. Yet, as devastating and startling as Cannae was, it was only one of a long list of incredible...