As soon as Wuguan was breached, Ma Teng's subordinate general Pang De and the elite soldiers in his hands immediately became ornaments.

Immediately afterwards, Cao Cao used the combination of Xiahou Yuan and Le Jin to lead 10,000 elite soldiers, quickly dispatched troops, and attacked Jingzhao County by surprise, and took Chang'an as soon as possible before Ma Teng and even Ma Chao, the Taishou of Jingzhao County, reacted.

Cao Ren led 3,000 elite soldiers to attack Tongguan in Beach, and was responsible for blocking the passage for Pang De to lead the army back to Guanzhong to aid Jingzhao County.

Cao Cao himself, along with a group of military advisors, the tiger and leopard cavalry led by Cao Chun, and 10,000 Qingzhou soldiers, followed closely behind and entered Jingzhaoyin through Wuguan.

The military advisors who accompanied the army were Guo Jia, Xun You, Zhong Xuan and Dong Zhao, and the latter two, when Dong Zhuo was alive, they had always been officials by Emperor Xian of the Han Dynasty, and they were more familiar with Guanzhong affairs than others.

During the Han Dynasty, the eastern fortress of Guanzhong was not Tongguan, but Hangu Pass.

In the original history, at the end of the Eastern Han Dynasty, Cao Cao set up Tongguan in the first year of Jian'an in order to prevent the rebellion in Guanxi, and at the same time abandoned Hangu Pass. This is the starting point of Tongguan as the exit and important town in the eastern part of Guanzhong.

In this time and space where Jin Jue is located, because of his influence, four years before Jian'an, Cao Cao was never able to infiltrate his influence into Henan Yin, let alone Guanzhong.

However, even if Tongguan has not been built now, the terrain there is extremely dangerous, with the Qinling Mountains in the south and the forbidden valley in the southeast; In the north, there are Wei and Luo Erchuan to join the Yellow River and hug the pass down, and the west is close to Huayue. The surrounding mountains are even mountains, peaks and peaks, the valleys are deep and the precipices are exclusive, the mountains are high and the roads are narrow, from the Hangu Pass to this, the narrow sheep intestine path in the middle, only allow a car and a horse.

Cao Ren only needs to set up a simple camp in a dangerous place, and he can successfully block Pang De's passage into the customs.

Xun Yu, Xiahou Dan, Xiahou Shang stayed in Xu County, Cheng Yu, Cao Xiu and Cao Zhen stayed in Dong County, Xun Yu and Cheng Yu had already secretly begun to implement the gradual relocation of the people of Yanzhou and Yuzhou into Guanzhong.

After the third battle of Xuzhou, after many inquiries by the secret agents in the hands of Guo Jia, Cao Cao learned that in this battle, because of Liu Bei's newly activated small person, he was not only forced to withdraw his troops in advance, but also lost Taishan County, an important town in the east of Yanzhou, and even Lu Qian, the Taishan County Taishou appointed by Cao Cao, was not spared.

Not only that, but even the Chen family, who was instigated by Cao Cao and betrayed Liu Bei according to Guangling County, sent troops to prepare for a sneak attack on Picheng, was defeated at the hands of a young general named Jin Hou who was less than twenty years old.

Because of this incident, Cao Cao had to start to spend a lot of effort to cultivate the second generation of young and handsome people in the surnames Cao and Xiahou, among them, the age is the same as Cao Cao's age this time, among the people in their early twenties, that is, Xiahou Shang, Cao Zhen and Cao Xiu, at the same time, the three of them are also the most favored by Xun Yu.

Therefore, before Cao Cao left Xu County, he gave each of the three juniors 3,000 soldiers, so that the three of them could carefully guard against the surrounding enemies while assisting Xun Yu and Cheng Yu in implementing the plan of immigrating to Guanzhong.

Xiahou Shangtong led the remnants and Li Tong, who had newly recruited recruits stationed on the southern boundary of Yingchuan County, to guard against Liu Biao and Liu Bei, while Cao Zhen and Cao Xiu commanded troops to guard against Liu Bei's army on the border with the area currently controlled by Liu Bei.

Not only the three of them, Cao Cao left Cao Pi in Xu County, and sent Cao Zhi to Puyang, so that the two sons he was most optimistic about could test the abilities of the two sons while assisting Xun Yu and Cheng Yu.

In order to prevent Liu Biao from attacking Wuguan from behind, Cao Cao left Jia Kui in the pass and temporarily assumed the task of defending Wuguan.

Last year, Jia Kui took the initiative to invite Ying to Changsha County, trying to use the edict of Emperor Xian of the Han Dynasty to persuade Taishou Zhang Xian to raise the banner against Liu Biao. However, no one thought that Sun Ce's strategy would change so quickly and so urgently, and he actually led his troops to attack the three counties of Jingnan before early spring.

Zhang Xian, who had been successfully persuaded by Jia Kui, immediately changed his mind, in fact, he also had to change his mind. Who knows if the ambitious Sun Ce will take the initiative to march into Changsha County after taking the other three counties in Jingnan and killing his father's enemy Huang Zu. Therefore, since Sun Ce sent troops to the three counties of Jingnan, Zhang Xian has spent all his energy on the deployment of defense in the entire Changsha County.

Seeing this situation, Jia Kui had to take the initiative to resign from Zhang Xian.

In fact, Sun Ce's sudden dispatch of troops to Jingnan this time and captured most of the three counties of Jingnan in a very short period of time had indirectly accomplished their predetermined goal for Cao Cao and Jia Kui - to use Jingnan to attract Liu Biao's attention, so that at this time, the only prince who could threaten Cao Cao's westward expansion plan would have no time to divide his troops and interfere with Cao's plan.

Although Sun Ce's dispatch did not conform to Cao Cao's thoughts, as a result, Cao Cao and his advisers all agreed that Liu Biao would not be able to send troops to trouble Cao's army for a long time in the future.

As soon as Jia Kui came back, Cao Cao did not take him into the pass with him, but left him behind to be responsible for guarding the Wuguan, but he felt in his heart that Jia Kui, who was extremely loyal to him, was a little too unlucky.

Up to now, Jia Kui has sent two successive envoys to the princes for Cao Cao, but the results of these two missions have not met any of Cao Cao's previous expectations, but have indirectly boosted the strength of the two local princes who are a great threat to Cao Cao's unification of the Han Dynasty - Jiangdong Sun Ce and Yizhou Jin Jue. Don't look at Sun Ce and Cao Cao are still allies, but Cao Cao and Sun Ce both know in their hearts that they will become enemies sooner or later.

Because of the Jingnan raid launched by Sun Ce this time, Cao Cao's attention to Sun Ce has surpassed Yuan Shao and ranked behind Jin Jue among the princes of the world.

At the same time, the combination of Cao Hong, Li Dian and Yu Ban led 20,000 people to Yin, Henan, of which only 6,000 were old Qingzhou soldiers, and the remaining 14,000 were newly recruited.

Cao Cao sent all three of his generals to Yin, Henan, which had already been emptied by Sima Yi, and the main target was not Pang De stationed in Hongnong County, but Sima Yi in Hedong County, and then the entire Lü Bu army.

It is said that Hongnong County is dangerous, easy to defend and difficult to attack, as long as Pang De guards Hangu Pass, he can block Cao's army from passing through Hongnong County and entering the passage to Guanzhong. However, Ma Tengjun has now lost Wuguan, allowing Cao Jun to block Pang De's passage back to Guanzhong.

Even if Cao's army did not attack Hongnong County and Hangu Pass, Pang De and his 3,000 elite soldiers would only be reduced to decoration.

As soon as the news of Cao's sudden attack on his ally Ma Tengjun came out, the princes of the world were greatly shaken.