In 48 AD, the Xiongnu were again divided into northern and southern divisions under the blows of the Eastern Han Dynasty. After the grandson of Hu Han led more than 40,000 people to the south to annex the Han Dynasty, the Northern Xiongnu who remained in the north of the desert became the key target of the Eastern Han Empire. According to Mr. Zhu Kezhen's research, the climate in East Asia was gradually getting colder at that time, and the temperature drop was global, showing a gradual decline from east to west. The grazing capacity of the desert steppes, ravaged by the cold and arid climate, fell sharply, and the nomadic herders of the Northern Xiongnu could no longer provide enough food. The huns, who migrated throughout the year, apparently noticed that the pastures in the west were more lush than in the east. In fact, even if the Xiongnu were difficult to move to their homeland alone, they could not withstand the frequent rebellions of the Xiongnu nobles and the repeated attacks of the Xianbei and Wuhuan people of the Eastern Hu remnants. The Eastern Han Dynasty did not miss the opportunity to beat up the falling water dogs. In 89 AD, the Eastern Han Dynasty, together with Xianbei and the Southern Xiongnu, once again launched a large-scale attack on the Northern Xiongnu. Shi Zai, "Dou Xian, Geng Bing, and others went out for three thousand miles, climbed Yanran Mountain, and ordered the Central Protector Ban Gu to make an inscription, and carved a stone to return." "However, when the Northern Xiongnu were nowhere to be found, the Eastern Han Empire suddenly discovered that the Xianbei and Wuhuan people had become the climate. Compared with the Xianbei people scattered in the northern desert, the Wuhuan people, who had infiltrated the North China Plain, posed a more serious threat to the Han Dynasty.
Map of the Northern Frontier forces of the Eastern Han Dynasty in 90 AD
In 207 AD, Cao Cao, who had replaced the Yuan family, could no longer tolerate Wuhuan's interference in the affairs of the Central Plains, but recruited elite troops to launch a rushing attack on Wuhuan. Jian Dun and the other Wuhuan leaders were caught off guard and were beheaded by Cao Jun in a fierce battle. After the war, Cao Cao forcibly moved the remnants of Wuhuan into Senay and conscripted their young men into the army. The decline of Wuhuan made Xianbei take advantage of it, and they took in the fleeing Wuhuan people and occupied the original pasture land of the Wuhuan people. At this point, Xianbei took over the scepter of the Xiongnu. Thankfully, at that time, the xianbei was not unified, and the various ministries were still fighting over the issue of territory. Of course, the plundering of Han China was also one of their important daily activities. Cao Cao, who was caught up in the disputes in the Central Plains, could not take care of it, so in 215 he deposed the formations of Yunzhong, Dingxiang, Wuyuan, and Shuofang Counties, and moved the people of the four counties to the south of Hengshan to avoid their fronts. Later, in order to stabilize northern Xinjiang, Cao Cao decisively transferred Tian Yu to Youzhou as a lieutenant of Wuhuan, a general of Zhenwei, and a governor of Hezhou.
Cao Cao stills
Speaking of Tian Yu, this person's early behavior was very strange. When Gongsun Zhan was in charge of Youzhou, he did not blindly follow the wind, but attached himself to Liu Bei, who was then sima of the other department. However, when Liu Bei became the Assassin of Yuzhou, Tian Yu left decisively. It should be noted that Liu Bei was not really a history of the Yuzhou Assassins at that time, but Xuzhou Mu Taoqian wanted to use his strength to oppose Cao Cao and recommended it to the imperial court. Shi Zai, "The first lord of the humble table is the History of Yuzhou Thorn, Tun Xiaopei". Perhaps, the long-term relationship made Tian Yu see through Liu Bei's difficulty in becoming a hegemon, so he left under the pretext of going home to serve his old mother. Liu Bei was deeply sorry for Tian Yu's departure, and before leaving, he repeatedly lamented and sighed, "Hate not to achieve great things with Jun."
Back in Youzhou, Tian Yu was appointed by Gongsun Zan as the Commander of Dongzhou. At that time, Gongsun Zhan's general Wang Men rebelled. The multitude was outnumbered, and the city wanted to surrender. Undaunted by the danger, Tian Yu went to the city alone to face the enemy, and with only a sharp mouth, he retreated from the shame of the rebels. After Gongsun Zhan's defeat, Tian Yu promptly persuaded Xian Yufu to submit to Cao Cao. This time, Tian Yu once again showed a unique sense of sight. At that time, Yuan Shao had You, Qing, And Ji, the most extensive land and the strongest military strength, but Tian Yu believed that Cao Cao would be the one who would pacify the world in the future. Xian Yuyao's response to Cao Cao subtly influenced the future situation in Guandu, and after the war, Cao Cao excitedly said to Xian Yufu, "Before Yuan Shao attacked Gongsun Zhan, I felt that I would soon die. It is both providential and your credit for the fact that it is now a victory. As a result, Xian Yufu was added to the rank of knight, and Tian Ye was also official to worship Yiyang Taishou.
Battle of Guandu in 200 AD
The so-called, "born in Si, grew up in Si". Living in northern Xinjiang for a long time, Tian Yu was well aware of the habits of ethnic minorities such as Xianbei and Wuhuan. In 218 AD, The Northern Wuhuan Rebellion was carried out, and Cao Zhang was ordered to fight it. Cao Cao was worried that Cao Zhang's march would be premature, so he appointed Tian Yu, who was the heavy-handed man of Lao Cheng, to accompany the army to plan military affairs. Sure enough, Cao Zhang's enemy ventured forward and was surrounded by Wuhuan cavalry. Fortunately, Tian Yu used the terrain to organize troops to form a circular formation with military vehicles and shoot enemy troops with crossbows. The Wuhuan cavalry could not break through the Cao army's army, but led the army to retreat. Cao Zhang, taking advantage of the victory to pursue, not only eliminated the rebellious Wuhuan people, but also greatly deterred the Xianbei people who came to help the battle. Shi Zai, "The humble lord Kirby can ride tens of thousands of horses to see the strength and weakness, see the strength of the battle, all directions are broken, but please obey." After the war, Tian Yu was criticized for his first merit, and the official paid homage to Nanyang Taishou. From this point alone, we can know the weight of Tian Yu in Cao Cao's heart. At that time, Cao Cao failed to fight for Hanzhong, and the entire county of Hanzhong had been taken into Liu Bei's pocket. Guan Yu's army in Jingzhou was also taking a boat on the Northern Expedition, and the troops reached Fancheng. If Liu Bei sent an army from Shangyong and Fangling to the east of the Han River, the Cao army in Xiangyang would surely be attacked on its back. Moreover, Nanyang is in the midst of a rebellion, and it also needs a person with excellent wisdom to guard it. Tian Yu lived up to expectations and joined forces with Cao Ren to quell the rebellion.
219 AD
Just when the three kingdoms were in strife, the Xianbei ministries initially completed the integration, and the aforementioned Xianbei Lord Kirby began to grow bigger. He learned the tricks of the Central Plains people's long-distance and close-range attacks. In order to prevent Cao Wei from interfering in his war to unify Xianbei, Kirby was able to pretend to submit to Cao Wei and accept the title of "King of Fuyi". In addition, he also twice sent more than 2,000 exiled Han Chinese back to the Central Plains. Emperor Cao Pi of Wei was dreaming of conquering Sun Quan in the south and unifying Jiangnan, and of course agreed to reduce military conflict between the two sides. The trade with Cao Wei benefited Kirby greatly, and he received a lot of living and military supplies that were scarce in the grasslands, and his strength was further enhanced. Aware of the humble and restless, the Wei Emperor Cao Pi decisively transferred Tian Yu to Youzhou. Tian Yu once again lived up to expectations, and after taking office, he defeated the invading Kirby Neng in one battle. Shi Zai, "The people scattered, all abandoned their bows and horses, forced to fight for more than twenty miles, and the zombies covered the ground." Later, Tian Yu personally led more than a hundred horsemen to attack and kill the Wuhuan King Bone Jin. Since then, the Hu people have broken their guts, and Tian Yu's prestige has spread far and wide in the desert.
According to Tian Yu's management method of "ruling Yi with Yi", Cao Wei's northern Xinjiang has been safe and sound for nine years. Soon, Cao Wei's henchmen wanted Wang Xiong to be a lieutenant in Karasuma, so they framed Tian Yu's pretense on the frontier, and Emperor Wen of Wei transferred Tian Yu to Berantaishou. In 223, Gongsun Yuan of Liaodong secretly contacted Eastern Wu to rebel, and Emperor Wen of Wei reused Tian Yu again and ordered him to oversee the defense. Through intelligence, it was learned that a fleet sent by Sun Quan was heading for Liaodong. Tian Yu observed the offshore wind and waves and asserted that the Wu people were afraid of the waves and waves, and would inevitably choose to anchor somewhere in Shandong. Therefore, Tian Yu quietly sent troops to ambush and successfully captured wu guoshi who were moored on the shore. Unfortunately, Tian Yu was a decent person, and when he oversaw Qingzhou, he offended Qingzhou's assassin Shi Chengxi. Cheng Xi was dissatisfied and slandered Tian Yu for intercepting the seized goods and fattening himself. Therefore, although Tian Yu had meritorious service, he was not allowed to be rewarded.
Battle of Hefei
In 234, Sun Quan led 100,000 troops to attack the new city of Hefei. This time, Sun Quan has a large layout. The Eastern Wu general Lu Xun and the great general Zhuge Jin respectively led troops to garrison Jiangxia and Chukou to contain Xiangyang, while the Zhenbei general Sun Shao and the Fenwei general Zhang Cheng, respectively, marched to Guangling and Huaiyang to cooperate with the main force. Sun Quan believed that Zhuge Liang's Sixth Northern Expedition had pinned down the elite of the Wei army, and it was the right time to take Hefei. When the Wei general Man Yu heard of Sun Quan's offense, he wanted to lead his troops to fight, but Tian Yu, then 63, immediately stopped him. He believed that the Eastern Wu army was good at water warfare and relied on the convenience of waterways every time it invaded Hefei. Today, a new city of Hefei, far from the waterway, has been built. Eastern Wu lost its strengths, and the long journey would be exhausting. Therefore, we should allow this Wu army to attack the city. Hefei New City is strong, Wu Army for a long time, morale will be weakened, then it can be defeated with one blow. Man Yu played Tian Yu's insight to the Wei Ming Emperor Cao Rui, who felt very reasonable. Later, Cao Rui saw that the battle situation was as predicted by Tian Yu, so he diverted the water division to the south to rescue. Sun Quan heard of Cao Rui's personal conquest and led his army to retreat.
After the death of the Wei Ming Emperor Cao Rui, Cao Fang succeeded to the throne, and Tian Yu was reused again, and was promoted to the position of envoy to protect the Xiongnu Zhonglang General, and the general Zhenwei commandery, who led the state assassination history. The Hu people inside and outside the state heard of his past prestige and successively came to the DPRK to contribute. Tian Yu adhered to the consistent style of incorruptibility, and sent all the items donated by the people to the treasury, even if they were personal gifts. Later, Tian Yu felt old and repeatedly asked to resign. Wei Ting refused many times, but Tian Yu continued to be on the table. Reluctantly, the imperial court had to agree and gave him a false position as a Taizhong doctor. In 252 AD, Tian Yu died of illness at the age of 82. By this time, the Sima family had taken control of the Cao Wei regime.