出敌不意

Explanation: Expected that the enemy out of action 　　Usage: Verb-object type; as the predicate attribute; with compliment 　　Source: Yao Xueyin "Rereading," Volume VIII: "Better let me go, the enemy unexpectedly, _insert_ punch down the middle, may be able to punch the enemy positions chaos." Thesaurus:  Happen unexpectedly, By chance Ing, upset, unexpectedly, Out its take at advantage, against expectation, The enemy accident