User blog:Dark Paladin X/Guaizi Ma

Guaizi Ma is a unique Castle Age tech available to the Jurchens that can be researched in the Castle. It allows Stable units and Iron Pagodas to deal 5 trample damage to adjacent enemies.

Strategy
Guaizi Ma is the main tech for the Jurchen cavalry. It allows all Stable units (Paladins, Hussars, and Heavy Camels) and Iron Pagodas to deal trample damage to adjacent units, making Jurchen cavalry very formidable in large battles when armies clump up together. Keep in mind that Blacksmith techs should be researched beforehand, considering that Guaizi Ma happens to be more expensive than the Jurchen's Imperial Age tech, Huo Pao.