Please help explain the content of this poem?

Where's Sue? Is there something wrong? Three Arrows Set Tianshan Mountain should be said to be from Xue's novels.

Di was a famous Di Qing in the Northern Song Dynasty, and Zhao was in the Qing Dynasty.

(repost) Emperor Taizong arrived at the front line of Anshi (now south of Haicheng, Liaoning) in June. When Tang Jun held a meeting with more than 100,000 reinforcements from North Korea outside Anshi City, Emperor Taizong saw a young officer in white armor shouting and rushed into the North Korean army, killing left and right, and was invincible. Tang Dajun followed closely, and the Korean army was defeated. After the war, Emperor Taizong immediately summoned the officer and appointed him as a guerrilla general. He is Xue (A.D. 6 14-683), a famous Tang dynasty, a native of Longmen (now Hejin West, Shanxi Province), who joined the army during the Zhenguan period. After An Shi's war, he was gradually promoted and made meritorious military service. During the reign of Emperor Gaozong (656-66 1), he assisted Cheng Mingzhen, the general of Loufangdao, in guarding Liaodong, and defeated the Korean and Qidan armies repeatedly, and was awarded General Zuo Wuwei. In the winter of the first year of Longshuo (AD 66 1 year), the nine surname of Tiele people harassed Tianshan Mountain, and he served as the deputy general manager of Tiele Road March, assisting Zheng Rentai, the general manager, to lead an expedition. When Tang Jun entered the Tianshan Mountains, Tiele's nine surnames gathered more than 100,000 people to fight. At first, he sent dozens of warriors to Tang Jun to ride horses and challenge. Xue shot three arrows in a row with a bow, and the arrows were all fired, killing three generals in a row. I will all dismount and beg for surrender. Xue chased the Gobi North and caught three brothers. The army sang: "The general will set the Tianshan Mountains with three arrows, and the strong man Long song will enter the Han Pass." In the second year of Ganfeng (AD 667), Li was appointed as the general manager of Liaodong March and sent to Korea. In New China (now Fushun, Liaoning), he led the North Korean army to attack the Gaopei Department of Tang Jun, and won a great victory. He was awarded the right-back general for his work. In the first year of Xianheng (AD 670), Tubo captured eighteen states in the western regions. The emperor took Xue as the general manager of Luopo Road March and Guo as the deputy general manager to pacify Tubo. Guo and Xue used to be at the same level, but this time he became Xue's deputy. Guo is unconvinced and often opposes Xue. Before entering Wuhai (now East Cuona Lake in Qinghai), Xue said to Guo, "Wuhai is dangerous and difficult to enter. If you take the baggage, it will be difficult to maneuver. " He asked Guo to leave 20,000 people to build a fence to guard the trench on the mountain of Dafeichuan (now in Qinghai), and he led the main force to pursue lightly. Then Xue led the main force to defeat Tubo in the estuary and stationed in Wuhai to wait for Guo to be blocked. Guo refused to listen to Xue's words and led the trench westward. When he met 200,000 Tubo people, Jun Guo was defeated and all the trenches were lost. Xue was forced to retreat to Dafeichuan, and was attacked by 400,000 troops led by the Tubo Qin Mausoleum, and was defeated. Xue was forced to make peace with the Qin tombs. He and Guo were both demoted to the people. In the first year of Yao Kai (AD 68 1), it was used by Emperor Gaozong to give Guazhou a secretariat. Soon after, he was appointed as the right captain of the national guard and the governor of the school. In the first year of Yongchun (AD 682), Yuan Zhen rebelled in Ashina and was ordered to lead an army to crusade. Ashina heard that Xue was coming back as a general, withdrawing troops, and was defeated by Tang Jun. Soon after the transfer, Xue died of illness.