《新唐书·本纪·卷五·睿宗 玄宗》
朔方军节度使王忠嗣在紫乾河打败奚军，趁势征伐突厥。
朔方军节度使王忠嗣及奚战于紫乾河，败之，遂伐突厥。
Wang Zhongsi, Jiedushi (节度使, military governor) of the Shuofang Army, defeated the Xi army at Zigan River and seized the opportunity to subjugate the Turks.