《元史·列传·卷三十五》
太祖二十年四月，宋将彭义斌军围东平，实暗中约定与大将孛里海联合出兵夹攻围东平宋军，但孛里海军迟迟不来，而东平城中粮尽，严实只得与义斌议和。
大臣有言其威权太盛者，中统二年，召还京师，命忠范代之。忠济治东平日，借贷于人，代部民纳逋赋，岁久愈多。
In the April of the 20th year of Taizu's reign, Peng Yibin, a Song general, led his army to lay siege to Dongping. In fact, Peng had secretly agreed to cooperate with the general Bo Li Hai in attacking the Song troops that had laid siege to Dongping. However, Bo Li Hai's troops did not arrive as scheduled, and the grain supply in Dongping was exhausted. Yan Shi had to make a peace treaty with Yibin.