Ballista

• The Ballista was a siege machine used in Classical Antiquity by the Greek and Roman Armies.
• It was a large torsion powered crossbow using twisted ropes, worked by two or more men, throwing either a metal bolt or a stone.

Roman Siege Machines

• The Romans adapted the design from the Greeks and called it the Scorpio.
• The design changed again, and it became the Cheiroballistra.
• It is not to be confused with the Onager, which was a catapult.