Xue Li, whose name is Rengui, was from Longmen Xiu Village, Jiangzhou, Shanxi Province (now from Xiu Village, Hejin City, Shanxi Province). He was a famous general of the Tang Dynasty, a famous strategist and politician. He has created illustrious military and political achievements such as "Good Strategies to Stop War","Three Arrows to Set Tianshan Mountains","Divine Courage to Capture Liaodong","Benevolent Government of Korea","Love the People's Xiangzhou City", and "Remove Your Hat to Report Thousands of Enemies".

Xue Rengui was poor since he was a child. He practiced martial arts and had strong arms. He grew up in farming and married Liu.

In the late period of Zhenguan of the Tang Dynasty, Emperor Taizong wanted to personally conquer Koryo. Starting from the autumn of the 18th year of Zhenguan (644), he mobilized military assets, grain, and recruited soldiers to actively prepare for the war. Xue Rengui went to General Zhang Tugui to recruit and was accepted as a subordinate. Soon, Emperor Taizong of the Tang Dynasty personally marched into Koryo. When Zhang Tugui's army arrived in Andi, Lang General Liu Junyin was surrounded by local armed forces. After Xue Rengui heard the news, he rode alone to the rescue, killed the enemy general, tied his head to the saddle, surrendered the remaining troops, rescued Junyin and returned to camp. From then on, Xue Rengui became famous among the three armies.

After returning to the Central Plains, Xue Rengui was entrusted with an important task and led the palace guards and was sent to Xuanwu Gate. In the fifth year of Yonghui of Emperor Gaozong of the Tang Dynasty, on the third night of the fifth month, heavy rain fell and flash floods broke out. When the water rushed to Xuanwu Gate, most of the people who protected the emperor had already fled for their lives. Xue Rengui was very angry and said: "How can the emperor be in urgent need? How dare you be afraid of death?" "Then Xue Rengui risked his life to climb the door frame and shouted to the palace to save Gaozong. Gaozong was grateful for his kindness and said: "Thanks to your call, I saved myself from drowning and learned that there were loyal ministers. "Tang Gaozong was very grateful to Xue Rengui, so much that he brought up this matter many times in the future. Perhaps everyone thought that this contribution was not a great contribution to opening up the border and expanding the territory, but the emperor believed that it was a great contribution. After all, he saved his life. Xue Rengui's life from then on has reached a new level.

In the leap month of the second year of Xianqing, Su Dingfang, the General of the Right Tunwei, marched into the Western Turks. Although Xue Rengui did not participate, he made the most important political decision and made an important contribution to Su Dingfang's annihilation of the Western Turks. In the third year of Xianqing, Xue Rengui, who was already 44 years old, finally began to command the army on his own and began his legendary career as a military commander (most Tang generals did not start to command the army until they were in middle age). In the third year of Xianqing, Xue Rengui and Cheng Mingzhen, the governor of Yingzhou and the Protectorate of Dongyi, harassed Koryo. Xue Rengui led his troops to capture Chifeng Town in one fell swoop, beheading 400 people and capturing more than 100 people. In June of the same year, Koryo sent general Doufanglou to lead 30,000 troops to face the Tang army. He was defeated by Xue Rengui and beheaded at a level of 3000.

In the fourth year of Xianqing, Xue Rengui led his army to fight against Koryo general Wen Shamen in Hengshan (now Huabiao Mountain in Liaoyang). Xue Rengui led the horse. The Koryo army could not resist and fled in defeat. He is already the commander of the army, but he can still take the lead, which shows his bravery and courage. In the same month, the Tang army fought with the Koryo army in Shicheng. Xue Rengui rode alone and captured a Koryo archer. At the beginning of the battle, a master archer from Koryo shot and killed more than 10 people in the Tang army in a row. At this time, Xue Rengui was furious and did not use his best archery to face the opponent. Instead, the straight horse rushed over, but Xue Rengui dodged the archer's archer. He got close to him and captured the master archer alive. In December of the same year, Xue Rengui and Xin Wenling defeated Khitan in Montenegro. Captured Khitan King Abgu and his leaders and escorted them to Luoyang, the eastern capital. Xue Rengui was promoted to General Zuo Wuwei due to his meritorious service and was granted the title of Hedong County Male. The Khitan King who was captured alive was the first political monarch that Xue Rengui captured alive. Look, there are still several "kings" who were captured alive by Xue Rengui.

In the first year of Qianfeng, Xue Rengui led his troops to Korea. Arriving in Xincheng, Pang Tongshan was attacked by the Koryo Army. After Xue Rengui learned of this, he led his army to arrive in time, killed hundreds of enemy leaders, and rescued Pang Tongshan. Pang Tongshan and Gao Yan entered Jinshan and were attacked by the Koryo army. After hearing the news, Xue Rengui led his army to cut off the Koryo army into two and beheaded more than 5000 levels. He also seized the victory and captured the three cities of Nansu, Mudi and Cangyan in Koryo, and met with the Quan boys. In this regard, Tang Gaozong issued a special edict to comfort Xue Rengui. Then, Xue Rengui led two more men to attack Fuyu City, an important town in Koryo. At this time, the generals advised him not to advance lightly because of the small number of troops. Xue Rengui said: Soldiers were "good at making good use of them, not in numbers," so he led the army on an expedition. In this battle, he led the army and killed more than 10,000 people in total. He attacked Fuyu City, and his reputation was greatly enhanced. More than 40 cities in Fuyu River followed the wind and surrendered one after another. At this time, the Tang Dynasty sent Li Ji as the chief manager and took advantage of the opportunity to attack Koryo. Xue Rengui also continued to advance along the coast and joined forces with Li Ji in Pyongyang City, where Koryo surrendered. Later, Emperor Gaozong of the Tang Dynasty ordered Xue Rengui and Liu Rengui to lead 20,000 troops to stay in Pyongyang, and appointed Xue Rengui as the General of the Right Wei Wei, Duke of Pingyang County, and concurrently Governor of Andong. After Xue Rengui was appointed, he moved to Pyongyang to a new position. During his tenure as Andong Protector-General, he cared for orphans and children, cared for the elderly, punished thieves, promoted virtuous people, praised people who were virtuous and upright, and the scholars and people of Koryo lived and worked in peace and contentment.

When Xue Rengui was appointed as Andong Protectorate, Tubo gradually became stronger, destroying Tuyuhun, established by the Qiang people, and invading the Western Regions of the Tang Dynasty. To this end, Emperor Gaozong of the Tang Dynasty transferred Xue Rengui as the general officer of the Luopo Road March, and appointed Ashina Daozhen and Guo Daifeng as deputy generals, leading more than 100,000 troops to attack Tubo.

Xue Rengui was ordered to head west and his army reached Dafeichuan (now the Cheji Plain in the southwest of Gonghe County, Qinghai; one said that the Buha River in the west of Qinghai Lake) and was about to head towards Wuhai (now the southwest of Guanghai County, Qinghai). Xue Rengui said to Ashina Daozhen and Guo Daifeng: "Wuhai is dangerous and miasma. If I go to death, it can be said that it is a dangerous road. However, if I hurry, I will achieve merit, and if I delay, I will lose. Now that Dafei is in a wide and flat position, we can set up two fences, collect all the baggage, and leave tens of thousands of people to guard it. We will accompany the road to hide the rebels and destroy them. "Guo Daifeng volunteered to stay behind, and Xue Rengui instructed him not to act recklessly.

After making arrangements, Xue Rengui led his troops to Wuhai and reached the estuary. When he encountered Ao Wan, the Tibetan garrison troops, Xue Rengui led his troops to charge and kill them all. Xue Rengui herded more than 10,000 cattle and sheep, marching westward, straight to the Wuhai River, and then sent more than a thousand cavalry back to Dafeichuan to pick up the baggage, but by this time Guo Daifeng had been defeated by Tubo. Xue Rengui withdrew from Dafeichuan because he had no baggage to support him. At this point, Tubo mobilized 400,000 troops to attack. The Tang army could not resist the enemy and was defeated. However, Tubo was not poor and negotiated peace with Tang on the condition that the Tang army would not go deep. Xue Rengui had no choice but to agree and then led the defeated army back east. After the war, he was exonerated from common people due to his defeat.

Soon, the Koryo region led each other to betray the Tang Dynasty. Emperor Gaozong of the Tang Dynasty appointed Xue Rengui as the manager of Jilin Road to manage Liaodong. During his tenure, Xue Rengui was demoted to Xiangzhou for breaking the law, but was later pardoned and returned.

In the first year of Kaiyao, Xue Rengui, who was already 68 years old, began the last glorious war of his life. In the first year of Kaiyao, Xue Rengui became the chief historian of Guazhou (governing Jinchang, now Suoyang City, southeast of Anxi, Gansu). Soon, the Eastern Turks continued to invade the northern territory of the Tang Dynasty. Xue Rengui also became the commander of the right-wing army Wei and the governor of Daizhou (governing Yanmen, now Dai County, Shanxi Province). The following year, Turkic chief Ashina Gudulu gathered the scattered Turks, expanded his power, and called himself Khan. In the first year of Yongchun, he occupied Heisha City (now northeast of Hohhot, Inner Mongolia) to oppose the Tang Dynasty. In the same year, Ashide Yuanzhen (imprisoned for a crime), a tribal official of the Shanyu Protectorate (which governs northwest Inner Mongolia and Linger today), heard that Ashina Gudulu rebelled against the Tang Dynasty, so he falsely claimed to have inspected the Turkic tribe in order to serve himself and took the opportunity to defect to Ashina Gudulu. Because Ashina Gudulu was familiar with the actual situation in the Tang Dynasty's border areas, Ashina Gudulu ordered him to serve as Aboda Dagan to lead the Turkic military forces and troops, invade Bingzhou (governing Jinyang, now southwest of Taiyuan, Shanxi) and the northern border of Chanyu Mansion, and kill Wang Demao, the governor of Lanzhou.

In the winter of the same year, Xue Rengui braved the snow and led his army to attack to stabilize the north. He led his troops to Yunzhou, what is today's Datong area, to fight against the Turkic Ashide Yuanzhen. The Turks asked,"Who were the generals of the Tang Dynasty?" "Tang Bing said: " Xue Rengui. "The Turks did not believe it and said," We heard that General Xue Rengui was sent to Xiangzhou and is already dead. How can he come back to life? Stop lying! Xue Rengui took off his helmet and showed it to the Turks. Because Xue Rengui was so famous, he had defeated the Jiujia Turks and killed many people before. The Turks were afraid of him even when they mentioned him. Now that they saw Xue Rengui alive, they immediately dismounted and knelt down and withdrew their troops. Xue Rengui came to fight. How could he be polite just because he had received a few bows? He immediately led his troops to pursue him and won a great victory. He beheaded more than 10,000, captured more than 30,000, and captured many cattle and horses.

On February 21, the second year of Yongchun (March 24, 683), Xue Rengui died in Yanmen Pass due to illness at the age of seventy. Emperor Gaozong of the Tang Dynasty posthumously awarded him the title of General Zuo Xiaowei and Governor of Youzhou (Qiaoxian Ji County, now southwest of Beijing City).

Xue Rengui was a famous general in the Tang Dynasty. He had the courage to fight hard, was good at using troops, and was deep in strategy. He established illustrious military achievements, thus making positive contributions to the prosperity of the early Tang Dynasty.