Mangonel was a type of traction trebuchet or siege engine used in Ancient China and operated on manpower pulling cords attached to a lever and sling to launch projectiles.
The mangonel, also called the traction trebuchet, was a type of trebuchet or siege engine used in Ancient China starting from the Warring States period, and later across Eurasia by the 6th century AD. Unlike the earlier torsion engines and later counterweight trebuchet, the mangonel operated on manpower pulling cords attached to a lever and sling to launch projectiles. 
