In November of the eighth year of Zhenguan, Tugu Hun Kou Liangzhou, and detained the envoy Zhao Deka

In November of the eighth year of Zhenguan, Tuguhun was taught.

Kou Liangzhou, and detained the envoy Zhao Dekai, Tang Taizong Li Shimin to Li Jing.

As the general manager of the Saikaido march, he made a large-scale crusade against Tuyuhun.

Tuyuhun was established at the end of the Western Jin Dynasty and reached the Sixteen Kingdoms of the Eastern Jin Dynasty.

controlled Qinghai, Gansu and other places, which was also its peak. Sui Dynasty.

After the establishment, Tuyuhun had crusaded against Tuyuhun, but the effect was not obvious, especially after the outbreak of the peasant uprising at the end of the Sui Dynasty, Tuyuhun took the opportunity to recover all the lost territory, and even challenged the Sui Dynasty from time to time.

Tang Gaozong. During the period, Tuyuhun went to war with the Tang Dynasty, but Li Yuan.

I really didn't care about him at the time. Later, however, Tuyuhun sent an envoy to pay tribute to Tang Taizong. But when the messenger returned, he became dishonest again.

After Tang Taizong ascended the throne, he sent an envoy to Tuyuhun to condemn Murong Fuyun to summon him to Chang'an to meet the emperor, but he was refused, but no one came, and the request came, and he instead asked Tang Taizong to marry a princess to his son Zunwang. Li Shimin agreed, but asked the king to go to Chang'an to marry the princess, and the king did not come, which angered Li Shimin and directly canceled the wedding.

At this time, the relationship between the two sides completely collapsed, and Fu Yun attacked Lanzhou and Kuozhou (now Haidong in Qinghai Province), and detained the Tang envoy Zhao Dekai. At first, Li Shimin, Taizong of the Tang Dynasty, sent a group of envoys to Tuyuhun to discuss the matter, and even summoned Tuyuhun envoys to talk to them in person, but there was no result, and they refused to give in.

So in the autumn of 634, Tang Taizong sent Duan Zhixuan, the general of Zuo Xiaowei, as the head of the Xihaidao march to lead the Tang army.

Defeat Fu Yun. Duan Zhixuan broke through Tuyuhun and led the army to pursue for more than 800 miles, but Fu Yun couldn't beat it and ran directly to the west.

However, after the Tang army retreated, Tuyuhun attacked Liangzhou (present-day Wuwei, Gansu) again. Li Shimin couldn't stand it at all. So he stopped making a small fuss, and directly prepared to send a large army to attack.

Originally, he was going to send Li Jing, but considering that he was not in good health and was already 63 years old, Li Shimin hesitated. Li Jing took the initiative to ask for help, so Li Shimin specially entered Li Jing as the general manager of the Xihai Road march, and also sent Hou Junji.

and other generals, a large-scale crusade against Tuyuhun.

But Tuyuhun is not easy to deal with, not very strong, but fast. However, under repeated blows, Tuyuhun suffered heavy losses. But at the same time, there was a problem within Tuyuhun, Fu Yun ran again and again, and the nobles then supported Fu Yun and his wife Sui Dynasty Guanghua Princess's eldest son Daning King Murong Shun as the master, and Murong Shun surrendered to the Tang Dynasty.

And Fu Yun's fate was not much better, and he was killed by his subordinates on the way to escape.

Tang Taizong asked the other party to come to Chang'an to hold a wedding, Tang Taizong restricted the freedom of the other party, also sent envoys to talk to them, and also sent troops to crusade and hit Tuyuhun, these are all things that Tang Taizong did.

In November of the eighth year of Zhenguan, Tugu Hun Kou Liangzhou, and detained the envoy Zhao Dekai. Li Shimin took the 61-year-old Li Jing in command of the western expedition, and five months later, the Tuyuhun Khan Fu Yun appointed his sister-in-law Murong Shun, the king of Daning, as the khan.