Enquiry into Gunpowder Weapons Used by Hülegü in the Middle East Campaign by Oğuz A.Y.

“…It turns out that these ballistas fired “rocket-assisted arrows”. These arrows carried paper tubes filled with gunpowder, which would increase their range to reach the mountain fortress of Maymun-Diz, and bombs covered with cartons, bamboo, ceramic, or metal which would set fire to the defenders of the fort. …”
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