Siege: A siege was something people did in the middle ages to overthrow castles. They did sieges to also cut of all resources that that castles to attack them and steal all that the people had within the walls. Sieges always ended up in a lot of destruction.
Trebuchet: A weapon used in the middle ages to overthrow a castle.
Trebuchet: The Trebuchet was used to siege. Trebuchet was a weapon used to overthrow castles. Trebuchets threw huge rocks the destroyed the castle's wall so the raiders could get inside. The trebuchet is only 1 of many siege weapons.