The length of the fuse could be adjusted according to the intended throwing distance. Its shell was made of cast iron and filled with gunpowder. Thunder crash bombs from the Mongol invasions of Japan (13th century) that were excavated from a shipwreck near Takashim, Japan. 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. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks. Its shell was made of cast iron and filled with gunpowder. 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. This article is within the scope of WikiProject History, a collaborative effort to improve the coverage of the subject of History on Wikipedia. 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. The length of the fuse could be adjusted according to the intended throwing distance. "thunder-crash bomb") during a Jin dynasty (1115–1234) naval battle of 1231 against the Mongols. The term was coined for this bomb (i.e. The thunder crash bomb (Script error) is an early type of bomb or hand grenade developed in 10th century China. Stub This article has been rated as Stub-Class on the project's quality scale. The length of the fuse could be adjusted according to the intended throwing distance. Its shell was made of cast iron and filled with gunpowder.