Assertion: surviving firearm | /r/HasProperty | the heilongjiang hand cannon
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text: The oldest surviving firearm is the Heilongjiang hand cannon dated to 1288, which was discovered at a site in modern-day Acheng District where the History of Yuan records that battles were fought at that time; Li Ting, a military commander of Jurchen descent, led footsoldiers armed with guns in battle to suppress the rebellion of the Christian Mongol Prince Nayan.