The Tang Dynasty was one of the most glorious dynasties in our country's history. In the former territory of the Han Western Region Protectorate, two major Protectorate Offices, Anxi and Beiting, were established as border government agencies in charge of the Western Regions. They existed for about a century and a half. Among them, Gao Xianzhi and Feng Changqing, who had presided over Western Affairs, made significant contributions to the Tang Dynasty's unification of the Western Regions and stability of the border areas.

Gao Xianzhi, whose ancestral home was Koryo, was the State of Koryo on the Korean Peninsula at that time. He used the country's name as his surname in accordance with customs. When he returned to the Tang Dynasty in his ancestors, his father Gao Sheji served as the ten generals of the four towns of Anxi and the general of the guards. Gao Xianzhi was a beautiful man who was good at riding and shooting. The young man followed his father to Anxi (now Kuqa) and made up the official position with his father's achievements. When he was in his twenties, he became a general, and his father and son were in class. In the early years of Tianbao, he was promoted to Deputy Protectorate General of Anxi and Military Envoy of the Four Towns. He was less than thirty years old. At this time, Feng Changqing came to join him.

Feng Changqing was from the Yi family in Puzhou (now Linyi, Shanxi). He lost his parents when he was a child and lived with his grandfather. His grandfather was exiled to serve in Anxi for crimes. He guarded the south gate of Hucheng and often taught him reading upstairs in his spare time. After the death of his grandfather, Feng Changqing, who was over thirty years old and was lonely and poor, felt depressed. Seeing Gao Xianzhi being crowded around him, dressed in luxurious official clothes, and majestic, he was very envious, so he generously wrote a letter and asked to be an entourage. Feng Changqing went out with the army for the first time and won a complete victory. He secretly wrote a detailed and comprehensive report of success in the tent. Gao Xianzhi read it and felt that it coincided with each other. He couldn't help but be surprised and looked at Feng Changqing differently from then on.

More than ten years ago, the Tubo Dynasty on the Qinghai-Tibet Plateau conquered the large and small Boru states in Kashmir west of the Pamirs, so that more than 20 states in the northwest were controlled by Tubo. As the western gate of the Tang Dynasty, the fall of Daxia Bolu not only blocked the Tang Dynasty's exchanges with Central Asian countries west of Pamirs, but also posed a direct threat to the four towns of Anxi. The Tang Dynasty sent troops several times to recover lost territory. Because the big and small Bolu were located in the mountains and were easy to defend but difficult to attack, they returned without success every time.

In 747 AD (the sixth year of Tianbao), Li Longji, Xuanzong of the Tang Dynasty, appointed Gao Xianzhi as the governor of Xingying, led his army to attack Bolu again, and sent eunuch Bian Lingcheng to supervise the army and supervise the war. Gao Xianzhi just showed his skills. He led more than 10,000 cavalry from Anxi to Wuchang City (in today's Aksu), passed through Wousse City (in today's Tumushuk), Shule (today's Kashgar), and entered Congling (today's Pamirs Plateau). He crossed mountains and rivers, divided his troops into three routes, and broke through Lianyun Fort, the important town of Tubo, killed 5,000 enemies, captured thousands of people, and seized more than 1,000 horses and a large number of military equipment. British explorer Stein was deeply impressed by Gao Xianzhi's feat and wrote in "Archaeology of the Western Regions":"I find it a pity that this brave China general did not build a monument or something like the pass to commemorate this. "Bian Lingcheng, who was in charge of the army, was unwilling to move forward, so Gao Xianzhi led his elite soldiers and continued to advance rapidly, reaching the Little Bolu Kingdom, capturing the king and princess, leaving behind the town army and returning to the army. After Gao Xianzhi was promoted to Anxi Jiedushi, he recommended that Changqing be appointed as a clerk to join the army and a judge of the Jiedushi. He was also appointed as a doctor of Chaoshan, who was in charge of the four towns 'warehouses, Tuntian, Jiaguan, branch and other material, equipment and logistics support matters. Feng Changqing was decisive, diligent and dedicated, and clearly rewarded and punished. He was deeply trusted by Gao Xianzhi.

In 750 AD (the ninth year of Tianbao), Gao Xianzhi once again sent troops to Congling, captured the pro-Tubo bandit king Botemei, and appointed his brother Sujia as the bandit king, relieving the dangerous situation of the Tang army guarding Xiaobolu. In the autumn of the following year, Gao Xianzhi led more than 30,000 cavalry and penetrated more than 700 miles into the city of Talas (known as Zhizhi City in the Han Dynasty, now Talas in Kazakhstan). After a stalemate between the two armies for five days, Gelolu's troops in the Tang army betrayed and attacked the Tang army with the Arab army. Gao Xianzhi was defeated and only led thousands of people to rush back to Anxi in panic. This battle did not affect the relationship between the Tang Dynasty and Arabia, nor did it have much impact on the political situation in the Western Regions at that time. However, after the War of Talas, some papermaking craftsmen among the Tang army soldiers captured by Arabia began to spread papermaking technology invented by China to the West, causing a revolutionary change in the history of world culture.

Due to the defeat of Talas, Gao Xianzhi was drafted into the court and changed to Hexi Jiedushi. Changqing was appointed deputy envoy of Yingtian, branch of the four towns, and promoted to deputy governor of Anxi and governor of Anxi. According to archaeological data that have been discovered, during the Tianbao period, the Tang Dynasty stationed a large number of farmland in Anxi, namely Kuche, with remarkable results in water conservancy construction and abundant treasuries. Feng Changqing, who was in charge of the matter, contributed greatly. In 753 AD (12th year of Tianbao), Feng Changqing led his division to crusade against the Dabolu State southeast of Xiaobolu, and won a complete victory.

In 754 AD (13th year of Tianbao), Feng Changqing entered the court and was awarded, and he also served as the governor of Beiting. Serving two towns, they combine power and glory, reaching the peak of life and career. He was diligent in state affairs and conscientious, constantly rushing between Anxi and Beiting (now Jimsar). The famous poet Cen Shen was appreciated by Feng Changqing and was appointed as the judge of Anxi and Beiting festivals. In his magnificent poems, he left us many poems about Feng Changqing. As the last famous general of the Tang Dynasty to govern the Western Regions before the An-Shi Rebellion, Feng Changqing followed the court's policy and defended Cong Ling as the western border, resolved his feud with the Arab world, and maintained a non-aggressive relationship. During the Anshi Rebellion, the Arab tribes also sent troops to help the Tang Dynasty suppress the rebellion. In addition, Feng Changqing also suppressed the Gelulu rebellion in Jinshan (now the Altai Mountains) and the Tubo rebellion in Boxian (now the Qiemo). He marched north and south, relieved his saddle, and made great achievements.

In 755 AD (14th year of Tianbao), Gao Xianzhi was granted the title of Duke of Miyun County. During the Tianbao years, An Lushan went south to rebel against the Tang Dynasty in the name of conquering Yang Guozhong. Emperor Xuanzong of the Tang Dynasty was panicked and hurriedly sent Feng Changqing, the Anxi Jiedushi, who was in Beijing to attend the meeting, to Luoyang to recruit troops to fight. Li Wan, King of Rong, was appointed Marshal and Gao Xianzhi was appointed Deputy Marshal. He led the Flying Cavalry, Qivalry, Shuofang, Hexi, Longyou and other soldiers, and also used money from the Forbidden City to recruit Guanfu recruits, totaling 50,000 people. Feng Changqing was defeated. On the 18th (January 24, 756 AD), Bian Lingcheng arrived at Tongguan. He first called Feng Changqing and announced an edict to him, beheaded him, and exposed his body on the reeds. Gao Xianzhi looked at the dead Feng Changqing again and sighed: "Feng Er, you came from the beginning to the beginning. I made you my judge, and soon he replaced me as a military governor. Today, he died here with you. How can it be fate?" "The words were killed. Gao Xianzhi was a famous military general during the Xuanzong period of the Tang Dynasty. He guarded Anxi and contributed to maintaining the security of the western border of the Tang Dynasty. His strategy of retreating to Tongguan and temporarily avoiding the enemy's front was conducive to preventing the rebels from marching westward into Chang 'an. However, due to the slander of eunuchs, Emperor Xuanzong of the Tang Dynasty listened and believed in him, and he died, which is regrettable. In addition, Gao Xianzhi also had serious problems in handling ethnic relations. Gao Xianzhi also had a large part of the responsibility for the Tang Dynasty's loss of rule in the Western Regions.