Thunder crash bomb

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Ceramic thunder crash bomb excavated from Takashima shipwreck, October 2011, dated to the Mongol invasions of Japan (1271-1284 AD).
A Mongol thunder crash bomb thrown against a charging Japanese samurai during the Mongol invasions of Japan after founding the Yuan Dynasty, 1281.

The thunder crash bomb (Chinese: 震天雷; pinyin: zhèntiānléi) is an early type of bomb or hand grenade developed in the 12th-13th century Song and Jin-era China. Its shell was made of cast iron and filled with gunpowder. The length of the fuse could be adjusted according to the intended throwing distance.