出其不意，攻其不备

Explanation: Pointed out that the soldiers attacked the original place they do not prepare. Also refers to the action after the people's expectations beyond. 　　Source: Phrase from the "grandson total": "Attack is unprepared, surprise." 　　Examples: Elite animals, by relentless ju, ~, then the edge of the hatred of people reported Benbei carry the shame of the snow. ★ "parameter of the Later Han Chuan Pang"