A siege weapon is a weapon used to attack or defend a fortified area, such as a castle or city. The most common siege weapon is the CATAPULT, which is an ancient device used to launch projectiles over long distances. Catapults were used in medieval warfare to breach castle walls and other fortifications. They were also used to launch incendiary devices, such as fireballs, into enemy camps. Catapults were powered by tension, torsion, or gravity, and could be made of wood, stone, or metal.