For a demonstration, see this YouTube video here however, the onager is instead referred to as a mangonel, which it often seems to be, but which Wikipedia deems is incorrect. Like the trebuchet, the onager is also a catapult that uses a rotating arm to throw a projectile, but instead of using a lever to rotate the arm like the trebuchet does, it uses tensed, twisted ropes to create a torque that will rotate the arm when the trigger is released. It is commonly depicted as a catapult with a bowl, bucket, or sling at the end of its throwing arm.The onager was first mentioned in AD 353 by Ammianus Marcellinus, who described onagers as the same as a scorpion. There are also hybrid trebuchets that use both a counterweight and manpower to pull the lever. The mangonel, also known as traction trebuchet, is a type of trebuchet that uses manpower to pull the lever, while the counterweight trebuchet, which probably is what most people associate with the word trebuchet, instead uses a heavy weight attached to the lever to pull it down. Youd use the trebuchet to rain rocks inside the building and the mangonel to pelt the walls and towers with rocks. The trebuchet is a catapult on which a projectile is attached to a long arm via a sling, and uses a lever to rotate the arm and hurl the projectile. According to Wikipedia, a catapult is a device used to launch a projectile without the aid of gunpowder or other propellants, particularly various types of ancient and medieval siege engines (which therefore excludes handheld ranged weapons).
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