Assertion: gunpowder | /r/ObjectUse | used in china
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text: Gunpowder was invented, documented, and used in China where the Chinese military forces used gunpowder-based weapons technology (i.e. rockets, guns, cannon), and explosives (i.e. grenades and different types of bombs) against the Mongols when the Mongols attempted to invade and breach the Chinese city fortifications on the northern borders of China.