《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.
<s>[INST] Convert the following English text into Classical Chinese: 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. [/INST] 朔方军节度使王忠嗣及奚战于紫乾河，败之，遂伐突厥。</s>
Convert the following English text into Classical Chinese: 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.
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朔方军节度使王忠嗣及奚战于紫乾河，败之，遂伐突厥。
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