The Ming were in fact the first gunpowder empire, as Tonio Andrade has argued extensively. The Chinese used firearms in great quantities from their inception, and constantly adopted foreign weapons and adapted them to their own use. Qi Jiguang argued forcefully that the arquebus was a wholly superior weapon to the bow, being more accurate and powerful. They adopted the breech loading Portuguese cannon, and then the muzzleloading Dutch cannon; they actually improved the latter by an ingenious method of casting the cannon as a composite of an iron throat and bronze body, combining the strength and cheapness of cast iron and the flexibility of bronze. For the most part, Chinese gunpowder weapons kept pace with Western developments until the mid 17th century, whereupon interstate warfare in East Asia markedly slowed down. In the 18th century, the adoption of the flintlock as the universal infantry arm and the development of scientifically designed cannon, combined with preexisting advantages in fortress and warship design and burgeoning industrial technology to create a decisive advantage in the Opium Wars.