Introduction to ancient cannons: The five iron cannons displayed next to the horse path at the entrance to the city in Badaling Pass were one of the advanced weapons of the time. Among them, the largest cannon has a barrel length of 2.85 meters, a caliber of 105 mm, a range of more than 1,000 meters, and great power. It was made in the 11th year of Chongzhen in the Ming Dynasty (1638).
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