以夷治夷

Explanation: Between the use of alien or foreign conflicts to conflict with each other, cutting power to control or attack the. 　　Source: "Ming Shi Zhangyou Biography" by Yi Yi rule, do not bother soldiers down. " Thesaurus:  2 Peach 3 persons, Second, killing three persons Peach, stab sb. in the back, murder by means of another's aword, to play off one foreign power against another (so as to prevent them from, Yiyifayi