《旧唐书·本纪·卷十九》
七月，沙陀族李友金等三部落打开城门迎接朝廷大军，李克用听到这个消息，急忙赶来增援，但是被李可举的军队追击，在药儿岭被打得大败。
七月，沙陀三部落李友金等开门迎大军，克用闻之，亟来赴援，为李可举之追击，大败于药兒岭。
In July, Li Youjin and the other three tribes of Sha Tuo opened the city gate and welcomed the army of the court. Upon hearing the news, Li Kegong hurried to reinforce them, but he was chased by Li Keju’s army and was defeated badly at Yaer Ridge.