《新唐书·列传·卷三》
其间派人前往党项诸部，宣谕国家威灵，其部落尽降后随李靖出击吐谷浑，下诏道彦为赤水道总管。
间遣入党项谕国威灵，区落降。从李靖击吐谷浑，诏道彦为赤水道总管。
During this period, he sent someone to the various tribes of Dangxiang to publicize the national authority. After all the tribes surrendered, he followed Li Jing to attack Tugu Hun, and Emperor Taizong decreed that Daoyan be the commander-in-chief of Chishui Road.