出敌意外

Explanation: See "the enemy unexpectedly." 　　Source: Mao Zedong's "war on Tianjin Campaign's approach" the enemy out of an accident of such plans, in your last deployment before, it is difficult to perceive the enemy out. " Thesaurus:  Happen unexpectedly, By chance Ing, upset, unexpectedly, Out its take at advantage, against expectation, s unpreparedness