👉 The screw weapon, also known as the trebuchet or mangonel, is a type of siege engine that uses a torsion-powered mechanism to launch projectiles over long distances. It consists of a long, vertical arm (the torsion spring) that is wound by hand or with a winch, storing potential energy. When released, this energy propels a heavy projectile, often a stone or metal ball, downwards with significant force and accuracy. The design allows for the construction of large, powerful weapons that could devastate fortified positions from a distance, making them crucial tools in medieval warfare.