《元史·列传·卷三十六》
十七年围凤翔，捏儿首先登城，斩数十人，左臂中箭，重伤，带伤进攻丹、延。
壬午，从围凤翔，先登，手杀数十人，左臂中流矢，创甚，裹创进攻丹、延。
In the 17th year, he besieged Fengxiang, Nie'er was the first to climb the city, and beheaded dozens of people. He was shot in the left arm with an arrow, seriously wounded, and led the attack on Dan and Yan.
<s>[INST] Kindly elucidate the central themes in this passage in English: 壬午，从围凤翔，先登，手杀数十人，左臂中流矢，创甚，裹创进攻丹、延。 [/INST] In the 17th year, he besieged Fengxiang, Nie'er was the first to climb the city, and beheaded dozens of people. He was shot in the left arm with an arrow, seriously wounded, and led the attack on Dan and Yan.</s>
Kindly elucidate the central themes in this passage in English: 壬午，从围凤翔，先登，手杀数十人，左臂中流矢，创甚，裹创进攻丹、延。
user
In the 17th year, he besieged Fengxiang, Nie'er was the first to climb the city, and beheaded dozens of people. He was shot in the left arm with an arrow, seriously wounded, and led the attack on Dan and Yan.
assistant