|Side view of a Pao, from 'Ji Xiao Xin Shu (《紀效新書》)'.|
|Top view of a Pao, from 'Ji Xiao Xin Shu (《紀效新書》)'.|
Ming Chinese inherited many Song period traction trebuchet designs, but did not seem to make use of any of them. Ming version of traction trebuchet was devised by general Qi Ji Guang (戚繼光). He greatly simplified the design and reduced the many variants of Song Dynasty traction trebuchet into one single type.
Although usually perceived as siege weapon, traction trebuchet is more often used in siege defense.