《史记·七十列传·卫将军骠骑列传》
在元封三年时，他当了左将军，领兵攻打朝鲜，没有功劳。
以元封三年为左将军击朝鲜，毋功。
In the third year of Yuanfeng, he became Left General and led troops to attack Chaoxian, but made no achievements.
<s>[INST] Kindly elucidate the central themes in this passage in English: 以元封三年为左将军击朝鲜，毋功。 [/INST] In the third year of Yuanfeng, he became Left General and led troops to attack Chaoxian, but made no achievements.</s>
Kindly elucidate the central themes in this passage in English: 以元封三年为左将军击朝鲜，毋功。
user
In the third year of Yuanfeng, he became Left General and led troops to attack Chaoxian, but made no achievements.
assistant