The Sling

The sling is the oldest projectile weapon. It used on trebuchets so that you can throw the projectile. They hold it up by using two strings. when it is ready to be fired they attach one part of the rope to the hook and it slides off so the projectile can be thrown. Here is a picture of the sling used on the trebuchet. I found this picture at  qwickstep.com/search/how-to-make-a-trebuchet-...