Zhang Shouxuan, our envoy from Youzhou, has made some achievements in military affairs. In the twenty-fourth year of Kaiyuan, Zhang Lingping's Lu Qiuji made An Lushan beg Xi and Qidan, saying that "Lu Shan relied on courage and made light progress, but was defeated by Lu". In twenty-six years, Youzhou ordered Zhao Kan and Bai Zhentuo to defend Zhang Shouxuan, forcing Pinglu Army to send troops to attack Xi and Qidan, winning first and then losing. "Keep the Xuan hidden, and play the meritorious deeds in vain". Gao Shi was deeply moved by the two defeats after the twenty-four years of Kaiyuan, because he wrote this "Yan Ge Xing".
Yan Ge Xing is a typical example of the use of laws and sentences in the seven-character songs of the Tang Dynasty. It goes without saying that the sentences and antithetical sentences that bet on rhyme are also in line with the flatness of the sentence, such as "they marched to the beat of gong and drum through the Elm Pass, the smooth and winding obstacles between the stones"; The rhyming sentences, the dual upper and lower sentences are also very neat, such as "three times a day a cloud of slaughter rises over the camp, and all night long the hour-drums shake their chilly booming."