《资治通鉴·唐纪·唐纪十八》
吐蕃撤退时，没有把杜孝升带走，于是他又率领余部防守临河镇。
吐蕃军还，舍孝升而去，孝升复帅馀众拒守。
When the Tubo retreated, they did not take Du Xiaosheng with them, so he led the remaining troops to defend Linhe town again.
<s>[INST] Explain the meaning of this Classical Chinese passage in English: 吐蕃军还，舍孝升而去，孝升复帅馀众拒守。 [/INST] When the Tubo retreated, they did not take Du Xiaosheng with them, so he led the remaining troops to defend Linhe town again.</s>
Explain the meaning of this Classical Chinese passage in English: 吐蕃军还，舍孝升而去，孝升复帅馀众拒守。
user
When the Tubo retreated, they did not take Du Xiaosheng with them, so he led the remaining troops to defend Linhe town again.
assistant