<Dl> <Dt> Trebuchet </Dt> <Dd> Trebuchets were probably the most powerful catapult employed in the Middle Ages . The most commonly used ammunition were stones, but "darts and sharp wooden poles" could be substituted if necessary . The most effective kind of ammunition though involved fire, such as "firebrands, and deadly Greek Fire". Trebuchets came in two different designs: Traction, which were powered by people, or Counterpoise, where the people were replaced with "a weight on the short end". The most famous historical account of trebuchet use dates back to the siege of Stirling Castle in 1304, when the army of Edward I constructed a giant trebuchet known as Warwolf, which then proceeded to "level a section of (castle) wall, successfully concluding the siege". </Dd> </Dl> <Dd> Trebuchets were probably the most powerful catapult employed in the Middle Ages . The most commonly used ammunition were stones, but "darts and sharp wooden poles" could be substituted if necessary . The most effective kind of ammunition though involved fire, such as "firebrands, and deadly Greek Fire". Trebuchets came in two different designs: Traction, which were powered by people, or Counterpoise, where the people were replaced with "a weight on the short end". The most famous historical account of trebuchet use dates back to the siege of Stirling Castle in 1304, when the army of Edward I constructed a giant trebuchet known as Warwolf, which then proceeded to "level a section of (castle) wall, successfully concluding the siege". </Dd> <Dl> <Dt> Couillard </Dt> <Dd> A simplified trebuchet, where the trebuchet's single counterweight is split, swinging on either side of a central support post . </Dd> </Dl> <Dd> A simplified trebuchet, where the trebuchet's single counterweight is split, swinging on either side of a central support post . </Dd>

What types of catapults are used in today's society