After Xue Rengui "fixed the Heavenly Mountain with three arrows", he did a shameful thing, and the emperor did not kill him but rewarded him
In the history of our country, there are many brave soldiers who are very good at archery, and many dynasties have produced such figures, such as when the Tang Dynasty, there was a person whose archery skills were very powerful, which made Li Shimin also praised, he is Xue Rengui. Xue Rengui was originally just a poor man, with a martial art, but he had been farming all along. Later, when Tang Taizong wanted to attack Goryeo, he recruited powerful people everywhere, and Xue Rengui took his bow and arrow to participate in the army of Liaodong.

In this battle, Xue Rengui's performance was very brave, and he made great achievements, which attracted the attention of Li Shimin and made him a general, after which he led his team to fight everywhere, and defeated the Goryeo people in the next year. In 661, Tiele, who had been nomadic in northern Mobei and was loyal to the Tang Dynasty, rebelled and harassed Tang's borders, and Emperor Gaozong of Tang asked Xue Rengui to lead an army to quell the rebellion. Before the war, Xue Rengui showed his super archery ability in front of the emperor, and shot through five layers of armor with one arrow, and the emperor was very emotional after seeing it, so he gave him a pair of more solid armor.
Xue Rengui then led his troops to the desert, and was attacked by tiele's 130,000 main army near Mongolia, and the Tiele people knew his prestige, so they did not start a war as soon as they came up, but let dozens of elite warriors challenge the Tang army. At that time, Xue Rengui chose to accept the challenge himself, when he was fighting with the enemy, when the other party approached, he shot three arrows in succession, and as his arrows went out, the three warriors fell in response. After seeing his divine courage, the remaining warriors all took the initiative to concede defeat, fearing that they would be killed. Seeing this, the morale of the Tiele people fell sharply, and they were very frightened, xue Rengui led the army to kill the enemy, causing the other side to be defeated, and capturing hundreds of thousands of men and women, this battle is also called the Three Arrows Dingtian Mountain.
After the victory, Xue Rengui did something that few people knew about and was very ashamed of, that is, in order to punish the rebellion of the other side, he brutally killed all the men of Tiele, snatched away the jewels, and distributed the beautiful women of the tribe to his subordinates, even he himself was assigned to several Tiele's concubines. After this, the originally powerful Tiele gradually declined and was annexed by other tribes.
After Xue Rengui's victorious return to the dynasty, he was impeached by many officials, saying that he killed people indiscriminately, and also privately possessed beautiful women and treasures, but Tang Gaozong believed that he had made great achievements, and the mistakes he made canceled each other out, not only did not pursue his mistakes, but also rewarded him with a lot of good things, and promoted him to an official position.