《新唐书·本纪·卷六·肃宗 代宗》
兴平军兵马使李奂与安庆绪部众在武关作战，将其打败，攻克上洛郡。
兴平军兵马使李奂及庆绪之众战于武关，败之，克上洛郡。
Li Huan, the infantry commander of Xingping County, fought against An Qingxu's army at Wuguan, defeated him, and captured Shangluo County.
<s>[INST] Kindly elucidate the central themes in this passage in English: 兴平军兵马使李奂及庆绪之众战于武关，败之，克上洛郡。 [/INST] Li Huan, the infantry commander of Xingping County, fought against An Qingxu's army at Wuguan, defeated him, and captured Shangluo County.</s>
Kindly elucidate the central themes in this passage in English: 兴平军兵马使李奂及庆绪之众战于武关，败之，克上洛郡。
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Li Huan, the infantry commander of Xingping County, fought against An Qingxu's army at Wuguan, defeated him, and captured Shangluo County.
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