Battles & Wars › Greece, Rome & Han › Conquests of Alexander the Great
Catapult and ballista (torsion artillery)
399 BC (Syracuse); torsion engines by c. 350 BC· Invention or discovery· Weapons, armor & warships
Mostly agreedGood evidence; some details, dates or numbers uncertain.
Ancient artillery that stored energy in twisted ropes of sinew or hair to hurl stones or bolts hundreds of meters.
See it on the Battles & Wars map →What happened
Engineers working for Dionysius I of Syracuse built the first catapults in 399 BC: giant crossbows with stiff bows. By about 350 BC Greek engineers, probably in Macedon, added torsion: twisted bundles of sinew or horsehair that threw far harder. Bolt-shooters picked off defenders; stone-throwers battered walls. Philip II and Alexander used them in sieges such as Tyre (332 BC). Romans adopted the ballista, and Archimedes designed engines that defended Syracuse against Rome.
Why it matters
They gave armies long-range firepower in sieges and battle, the first true artillery, and engineers designed them by formula, sizing the rope bundle to the weight of shot.
Think of it like
Like the wound-up rubber band on a toy plane: twisting stores energy, and releasing it snaps the arm forward.
How we know
Diodorus's account of Syracuse; Greek engineering manuals by Philon of Byzantium and Heron; Vitruvius; and excavated metal frames and bolt heads from Roman sites.
Still debated
Exactly where and when torsion was invented, and how accurate and powerful the engines really were, is debated; modern rebuilds give varying results.
Connections (4)
▸Siege of Tyre (332 BC) used ship-borne Catapult and ballista (torsion artillery)Well documented
The connection
Alexander's engineers mounted catapults and bolt-throwers on towers at the end of the causeway and later on ships lashed together, to clear defenders from Tyre's walls. The Tyrians answered with their own engines, fire ships and divers who cut the attackers' anchor cables. It is one of the earliest recorded uses of artillery at sea.
When and how
Tyre, spring and summer 332 BC; Alexander's engineers, probably including the siege specialist Diades, against Tyrian defenders.
How we know
Arrian, Diodorus and Curtius all describe engines on towers and ships at Tyre, and Diodorus describes Tyrian counter-engines.
Debates and open questions
Whether these were true torsion machines or older bow-type engines is debated, since torsion artillery was then only a few decades old.
▸Catapult and ballista (torsion artillery) defended Syracuse, with Archimedes, in the Punic WarsMostly agreed
The connection
In the Second Punic War, Syracuse sided with Carthage, and Rome besieged it in 214–212 BC. Archimedes designed catapults for different ranges and cranes that lifted and capsized Roman ships. They held Rome off for about two years; the city finally fell by surprise during a festival, and Archimedes was killed.
When and how
Syracuse, Sicily, 214–212 BC: the Roman commander Marcellus against the city's defenders and Archimedes.
How sure are we?
Polybius, writing within about 70 years, describes Archimedes's engines; Livy and Plutarch add later details.
Debates and open questions
The story of mirrors setting Roman ships on fire is probably legend, and how much Archimedes himself built is uncertain.
▸Catapult and ballista (torsion artillery) was succeeded in sieges by the Trebuchet (traction and counterweight)Mostly agreed
The connection
Torsion engines needed skilled builders and large amounts of sinew or hair rope, and the know-how faded after Rome's collapse in the West. The traction trebuchet, simpler to build and worked by a crew pulling ropes, arrived from the east in the late 500s and became the main stone-thrower of the Mediterranean world.
When and how
The Balkans and eastern Mediterranean, late 500s; an Avar siege of Thessalonica is among the first recorded uses.
How sure are we?
The Miracles of Saint Demetrius describe the Avar engines, and references to torsion machines become rare after the 400s.
Debates and open questions
How long torsion artillery survived, especially in Byzantium, and whether traction trebuchets came west via the Avars, Persians or others, is debated.
▸Roman fabricae: the empire's state arms factories built the late empire's Catapult and ballista (torsion artillery)Well documented
The connection
Some fabricae were artillery works making bolt-throwers and stone-throwers for frontier forts and field armies. Late Roman engines included the one-armed onager and the cart-mounted ballista, described by the writers Vegetius and Ammianus. Concentrating this skilled work in a few state factories kept artillery available as the empire's defenses hardened.
When and how
Artillery factories at Trier and Autun in Gaul, among others, about 285 into the 400s.
How we know
The Notitia Dignitatum names the artillery works, and Ammianus Marcellinus, an army officer, describes artillery in sieges of the 300s.
Debates and open questions
How many engines they built, and whether army units still built some of their own, is unknown.