Cao Caos Tuntian System 

This video will take a look at Cao Caos Tuntian System. Tuntian (屯田) or tunken (屯墾) was a type of frontier "military-agricultural colonies" in the history of China. Troops were sent to harsh landscapes at the Chinese frontier to turn uncultivated land into self-sustained, agrarian settler colonies. In other words, the soldiers doubled as farmers.
Sources
Chen, Shou (3rd century). Records of the Three Kingdoms (Sanguozhi)
Pei, Songzhi (5th century). Annotations to Records of the Three Kingdoms (Sanguozhi zhu)
de Crespigny, Rafe (1984). Northern Frontier: the policies and strategy of the Later Han empire. Australian National University
Sima, Guang. Zizhi Tongjian