David Baker: "The Sun Tzu repeating crossbow was a lot easier to re-create than I thought. It's a great piece of engineering. Relying on simple mechanisms and a leaf spring type bow, it produces a powerful, fast, easy-to-use weapon capable of firing 15 bolts a minute. Though it wasn't the most accurate weapon, what it lacked in accuracy, it made up for in speed. An army could put out 1,500 arrows per minute in the air with 100 men armed with these and someone loading for them. Even if they didn't kill the enemy with a single shot it would easily break a cavalry charge and slow even a heavily armed column."