The amazing successes and stunning failures of ancient military engineers have directly affected the weapons and tactics we use today. In fact, an ancient Greek weapon is still used on modern aircraft carriers. How did the Chinese develop a catapult with a firing rate of 10 rounds per second? Did the living horse battlefield torpedoes of the middle ages battlefield actually work? And, how did the great Carthaginian general Hannibal cross the highest mountain range in Europe using equipment still used by today's Special Forces, dissolving solid rocks in his path using an ancient chemical version of dynamite?