《元史·本纪·卷一》
后来也遭到西夏的进攻，被赶走，逃到了龟兹国，龟兹国首领派兵讨伐，把他杀了。
既而亦为西夏所攻走，至龟兹国，龟兹国主以兵讨杀之。
Later, he was attacked by Xi Xia, driven away and forced to flee to the Kingdom of Qiuci, where the Qiuci leader sent troops to defeat and kill him.
<s>[INST] Kindly elucidate the central themes in this passage in English: 既而亦为西夏所攻走，至龟兹国，龟兹国主以兵讨杀之。 [/INST] Later, he was attacked by Xi Xia, driven away and forced to flee to the Kingdom of Qiuci, where the Qiuci leader sent troops to defeat and kill him.</s>
Kindly elucidate the central themes in this passage in English: 既而亦为西夏所攻走，至龟兹国，龟兹国主以兵讨杀之。
user
Later, he was attacked by Xi Xia, driven away and forced to flee to the Kingdom of Qiuci, where the Qiuci leader sent troops to defeat and kill him.
assistant