Chinese Border Control Strategy - Yi Yijir Yi

The Dritan Dindenesti, that controlled the Yellow River Valley and Manchuria, had adopted many of the lifestyle, cultural, political, and military vestiges of the Song Chinese culture. In time, they increasingly abandoned their northern steppe nominism in favor of the richer and more luxurious sedentary lifestyle offered by the Chinese populace. Yi Yijir Yi's policy was to outsource large portions of border defense to groups of defeated or at least tamed, barbarian groups. This would form the outer bulwark of physical defense against the unsigned side, or the so-called uncooked or raw, barbarians that still sought to pillage what and where