《贞观政要·卷九·论征伐》
武德九年冬天，突厥颉利、突利二位首领率领二十万士兵，长驱直入到渭水便桥以北。他们派将领执矢思力入朝面见皇帝，执矢思力虚张声势地说： 二位可汗一共有兵马百万之众，现在已到了京师。 
武德九年冬，突厥颉利、突利二可汗以其众二十万，至滑水便桥之北，遣酋帅执矢思力入朝为觇，自张声势云： 二可汗总兵百万，今已至矣。 
In the winter of the ninth year of Wude, the two Turkic leaders, Jieli and Tulli, led 200,000 soldiers and marched all the way to the north of the Wei Shui Bridge. They sent their general Zhiyisi to the court to meet the emperor, and Zhiyisi exaggerated and said: "The two Khans have a total of 1 million soldiers and horses, and they have now arrived at the capital."