King An Dương commissioned Cao Lỗ (or Cao Thông) to construct a crossbow and christened it "Saintly Crossbow of the Supernaturally Luminous Golden Claw" "(nỏ thần)", which one shot could killed 300 men. According to historian K. W. Taylor, the crossbow, along with the word for it, seems to have been introduced into China from Austroasiatic peoples in the south during the third or fourth century BCE. It quickly became part of the Chinese arsenal; its trigger mechanism was capable of withstanding high pressure and of releasing an arrow with more force than any other type of bow. Two bronze trigger mechanisms have been excavated in Vietnam; most mechanisms were probably made of bamboo.