One of the most iconic images of the European Middle Ages is the castle. This defensive structure was often heavily fortified and provided its inhabitants with much-needed safety. It was usually quite difficult for an enemy to capture a castle, and for that, an attacking army needed siege engines. One of the most important and efficient siege engines was the catapult.

The Roman Onager

The catapult was a weapon used since ancient times. In its most basic form, the catapult may be described as a “one-armed stone thrower”. In the Roman world, a catapult-like siege engine known as the ‘onager’ (meaning ‘wild ass’) was used when the Romans were besieging an enemy. One suggestion for this name’s origins is that the Romans likened the stones that were hurled by the catapult to the rocks kicked up behind galloping hooves. An alternate suggestion is that the device jumped when it fired its projectiles. Another type of catapult, which had a sling, was known as the ‘scorpion’, as a shot from this device is reported to resemble the movement of a scorpion’s tail.

A Roman onager with sling (‘Scorpion’). (Public Domain)

Chinese Traction Catapults

Backyard Ballistics: B... William Gurstelle Best Price: $1.76 Buy New $8.32 (as of 05:55 UTC - Details) The use of catapults, however, was not limited to the Roman army. There are records which show that the catapult was also employed by the armies of ancient China as well. For example, during the early Spring and Autumn period (8th – 7th centuries BC), there was a machine called a ‘hui’ that was used by the King of Zhou against the Duke of Zheng during a battle in 707 BC. As the word ‘hui’ no longer exists, we cannot be completely sure of its meaning. Nevertheless, scholars from the Han Dynasty interpreted this device as a catapult.

A clearer mention of the catapult in Chinese sources may be found in the Mohist texts of the Warring States period (5th – 3rd centuries BC). In these texts, the catapults were operated using the lever principle, and are known as traction catapults. These devices could be used by either the besieger or the besieged. As a weapon employed by the besieged, the traction catapult could be used to attack enemy siege towers, and to hurl objects at enemy troops either to kill them or to disrupt their formation.

Ancient Chinese mobile catapult cart. (CC BY 1.0)

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