1. writing background: this poem depicts the strong will and determination of frontier fortress and other scholars to fight to the death in a long and harsh life. The situation of the inter-ethnic war at that time: the strong enemies of the west and the north in the Tang Dynasty were Tubo and Turkic. Our special envoy's task in Hexi is to cut off the traffic between Tubo and Turkic, and take care of the two powerful enemies in the west and north within one town, mainly to defend Tubo and protect the Hexi Corridor. "Qinghai" area is the place where Tubo and Tang Jun fought many times; Outside Yumenguan, it is the sphere of influence of Turks.
2. Original text:
Join the army (the fourth of seven songs)
Author: Changling Wang
There is a dark snow-capped mountain in Qinghai, with long white clouds and a lonely city looking at Yumenguan.
Yellow sand wears golden armor in hundreds of battles, and the broken loulan will not be returned!