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Ballista is a device designed to launch heavy stones or other objects over long distances. In the past, it was used in warfare to breach city walls or destroy fortresses. Its operating principle is simple: force is accumulated using a lever, spring, or ropes, then released suddenly to propel the stone forward. How Did the Ballista Emerge? The ballista is believed to have first appeared in China. Chinese sources mention the use of ballistae as early as the 5th century BCE. It later spread to the