《后汉书·列传·西羌传》
冬天，任尚率领各郡的部队与马贤一同进兵北地攻打狼莫，马贤先到安定青石岸，狼莫迎战，打败了马贤。
冬，任尚将诸郡兵与马贤并进北地击狼莫，贤先至安定青石岸，狼莫逆击，败之。
In winter, Ren Shang led the forces of the various prefectures with Ma Xian to advance together to Beidi to attack Lang Mo. Ma Xian arrived at Qingshi'an in Anding first, where Lang Mo responded to the challenge and defeated Ma Xian.
<s>[INST] Kindly elucidate the central themes in this passage in English: 冬，任尚将诸郡兵与马贤并进北地击狼莫，贤先至安定青石岸，狼莫逆击，败之。 [/INST] In winter, Ren Shang led the forces of the various prefectures with Ma Xian to advance together to Beidi to attack Lang Mo. Ma Xian arrived at Qingshi'an in Anding first, where Lang Mo responded to the challenge and defeated Ma Xian.</s>
Kindly elucidate the central themes in this passage in English: 冬，任尚将诸郡兵与马贤并进北地击狼莫，贤先至安定青石岸，狼莫逆击，败之。
user
In winter, Ren Shang led the forces of the various prefectures with Ma Xian to advance together to Beidi to attack Lang Mo. Ma Xian arrived at Qingshi'an in Anding first, where Lang Mo responded to the challenge and defeated Ma Xian.
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