以夷伐夷

Explanation: Old refers to the alien or foreign barbarians. Refers to the use of each other in the military conflict itself, the autocorrelation of conflict, weakening the power. 　　Usage: Partial official; as attribute; with a compliment 　　Source: "Han Tang Xun," proposed by Qiang Hu with salt to attack, the magistrate of the benefits to cutting Yi Yi, should not ban protection. " 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, Yiyizhiyi