Gunpowder was the Chinese invention carried westward and later became important to warfare along Silk Road networks. Chinese alchemists documented mixtures containing saltpeter, sulfur, and charcoal by the ninth century.
Early uses included incendiary devices, fireworks, and signal weapons. Over time, improved formulations and containers produced explosive bombs, rockets, and firearms. Knowledge moved through wider Eurasian networks during the medieval period, reaching the Islamic world and Europe.
The transmission was gradual rather than the result of one single journey or battle. Mongol-era warfare, diplomatic contact, and trade all helped connect military specialists across Eurasia. Arabic and Latin sources later described related technologies in their own terms.
Paper, printing, and the magnetic compass also originated in China and spread widely, so they are sometimes named in response to broad questions about Silk Road inventions. Gunpowder is the specific answer when the clue emphasizes an explosive military technology.