Notes: "The trebuchet originated in the medieval ages in China in the early 4th century B.C and then came to Europe in the 6th century AD. The trebuchet lasted in the battlefields of Europe for almost 10 centuries. It was used as [a] siege weapon in the battlefield. It was an effective weapon because it could hurl huge boulders of rock or fireballs at the enemy at great distances and causing maximum damage. " Source: Trebuchet Blueprints & Build Plans.