《资治通鉴·唐纪·唐纪四》
李世民命令屈突通率领五千步兵过谷水进击王世充，并告诫屈突通道： 军队一交锋立即放烟火。 
命屈突通帅步卒五千渡水击之，戒通曰： 兵交则纵烟。 
Li Shimin ordered Qu Tutong to lead 5,000 infantry across the Gu River to attack Wang Shichong, and warned him, “Send up a smoke signal as soon as you engage the enemy.”