From Gunpowder to Guns:
Gunpowder was first used to excavate mines, build canals, channel irrigation, set off fireworks, and kill off disease-carrying bugs. But later, the Chinese put the gunpowder into long tubes, which was used to threaten their opponent. Gunpowder was used to explosives, catapults, and mostly used when they were in contact with their enemy. The Song then invented metal gun barrels, and then China and Korea used gunpowder to shoot a bundle of arrows at a time.
Centralization and Militarism in East Asia, 1200-1500:
From the lands that the Mongols