《元史·列传·卷七十》
十七年春，红巾军攻陷商州，夺取七盘，占据蓝田县，距奉元仅三十里，思诚在安西王月鲁帖木儿官邸会见豫王阿剌忒纳失里及省院官，大家万分恐惧，拿不出任何对策，思诚说 ：陕西是要地，关系天下得失，察罕帖木儿是河南名将，贼一向害怕他，应该派使臣去求援，这才是上策。 
十七年春，红巾陷商州，夺七盘，进据蓝田县，距奉元一舍。思诚会豫王阿剌忒纳失里及省院官于安西王月鲁帖木儿邸，众汹惧无言，思诚曰： 陕西重地，天下之重轻系焉。察罕帖木儿，河南名将，贼素畏之，宜遣使求援，此上策也。 
In the spring of the seventeenth year, the Red Turban Army attacked and seized Shangzhou, took Qipan, and occupied Lantian county, which was only thirty miles from Feng Yuan. Sicheng met with the Prince of Anxi, Yue Lu Timur, the Prince of Yu, Ala Tenashili, and officials from the provincial government at the Prince of Yu's residence. Everyone was filled with great fear and could not think of any countermeasures. Sicheng said: "Shaanxi is an important area and its fall would affect the whole world. Chagan Temur is a famous general from Henan and the bandits fear him. We should send an envoy to ask him for help. This is the best course of action."