trébuchet
A trebuchet is a type of catapult, a siege engine that was developed in China in the 5th century BC and later adapted by the Arabs and Europeans. It functions as a type of lever that uses a counterweight to hurl a projectile. The earliest forms were typically human-powered, but later, more powerful designs incorporated a large counterweight. This counterweight, when released, swung downwards, pulling one end of a long beam upwards and forwards. Attached to the other end of this beam was a sling, which held the projectile. As the beam swung, the sling accelerated, and at a specific point in the arc, the projectile was released, propelled forward with great force.
Trebuchets were particularly effective against fortifications. Their ability to launch heavy projectiles over long distances and