《宋史·列传·卷一百二十五》
吴璘半夜时分派遣姚仲和王彦衔枚登上山岭，约定两人登上山岭后发火为号。
璘夜半遣仲及王彦衔枚截坡，约二将上岭而后发火。
In the middle of the night, Wu Lin sent Yao Zhong and Wang Yan to climb the mountain with a gag in their mouths, and agreed that the two would light a fire as a signal after they climbed the mountain.