Torsion Catapult

Type Object Region Mediterranean Time c. -400–500

The torsion catapult was the most representative siege and field projectile engine of the classical Hellenistic world, storing elastic potential ener…

Timeline

c. -400–-330Syracuse · SicilyClassical literature attributes the invention of the torsion ballista to craftsmen of the time of Dionysius I of Syracuse; replacing bow-arm bending with a twisted sinew frame allowed larger arrows to be launched, marking a fundamental shift in projectile engines from tension to torsion technology.
c. -330–-100Rhodes · RhodesThe armies of Philip II and Alexander were equipped with siege engines; during the Hellenistic period, city-states such as Rhodes and Alexandria developed large torsion catapults capable of hurling stones of a hundred kilograms, and established systematic mechanical theory, with the works of Philo and Heron recording their design parameters.
c. -50–1Rome · LazioFrom the late Roman Republic to the early Empire, legionary engineers (fabri) were issued standardized torsion ballistae (catapulta, ballista) and catapults (onager), widely used for siege and position defense in campaigns such as the Gallic Wars and Jewish Wars, with technical parameters systematically recorded by writers such as Vitruvius.

Sources

Greek and Roman Artillery: Historical Development — Eric W. Marsden (1969)
De Architectura — Vitruvius