《元史·列传·卷二十九》
至正十二年，河南人民起义军芝麻李部占据徐州，也速随太师脱脱南征。徐州城义军坚守，官军久攻不下。脱脱采用也速之计，用巨石为炮，日夜攻击不停，也速攻破徐州南关外城，义军被迫弃城转移。
至正十四年，河南贼芝麻李据徐州，也速从太师脱脱南征，徐州城坚不可猝拔，脱脱用也速计，以巨石为炮，昼夜攻之不息，贼困莫能支。也速又攻破其南关外城，贼遂遁走。
In 1352, the Sesame Li band of the Henan people's uprising army occupied Xuzhou, and Yisu followed the Grand Tutor Tuotuo on a southern campaign. The insurgent army in Xuzhou held out firmly, and the imperial army failed to conquer it after a long siege. Tuotuo adopted Yisu's plan and used boulders as artillery, attacking day and night without cease. Yisu conquered the outer city of the southern gate of Xuzhou, and the insurgent army was forced to abandon the city and move elsewhere.