From DT Online
Catapult type weapons have existed in so many different forms that Catapult can be regarded as a category rather than a particular Siege Weapon. The Chinese, during the Tang Dynasty (618AD–907AD) developed a Carroballista, which was a large Crossbow (i.e. Ballista) mounted on a wheeled cart.
The word Catapult comes from the two Greek words "kata" (downward or against) and "pultos" (a small circular battle shield). Katapultos was then taken to mean "shield piercer". The Greek Catapult (Katapeltikon) was developed in the 4th century BC. At first they were used to launch arrows and darts but in the reign of Alexander the Great, stone-throwing Catapults were introduced.
There were two broad types of artillery in the Ancient World. Tension devices derived their power from bending a bow-shaped structure and Torsion artillery relied on twisting loops of rope, horse hair or sinew. The Romans referred to Torsion Siege Engines as Tormentum and often used this term to describe Siege Weapons of various kinds.
Activity: Find out about Roman Siege Equipment (e.g. Vinea, Pluteus, Mantelet, Testudo (model), Musculus, Helepolis, Turris, Corvus, Ballista (aka Scorpion), Onager, Aries (Battering Ram) and construct a working model or models using Stripwood Technology.
Safety Point! Take great care with hot glue guns and all hot-melt glues. The melted glue can stick to the skin and cause severe burns.