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: Han of the material I did not dare cross Jiuding to my Bingshao from far away, and not worry about the speed I to have. ~ Persons, military commander of the winning strategy also. ★ "Six New History of the Five D will Biographies"