Xu Yu's importance is not how to defeat Yuan Shao. Instead, he proposed an important strategy to Cao Cao.

Xu Yu defected this time. Xu You turned out to be Yuan Shao's old subordinate, and he followed Yuan Shao when he was in Jizhou, was resourceful, and also mastered a large amount of military intelligence. Therefore, when Cao Cao heard that Xu Yu was coming, he ran out barefoot to greet him, rubbed his hands and laughed loudly and said, "Now my affairs will be easy to handle!" ”

So why did Xu Yu defect?

There may be two reasons for this, one is that Xu Yu did not adopt the policy. As a result, Xu You felt that Yuan Shao was unreliable. So, he defected.

The second reason is that Xu You's family is not taken care of by Yuan Shao. So, Xu You defected. Review the two reasons above. Or the first reason is more reliable.

Whatever the reason is, anyway. Xu Yu still defected. and also ran to Cao Cao's side and did a great favor.

So, Xu You came to Cao Cao's side.

Above, the author summarizes. The specific circumstances of Xu You's defection.

In the stage of the stalemate between the two armies of Cao and Yuan. The two sides went back and forth, fighting openly and secretly for several rounds. No one took advantage. At this moment, Cao Cao got an important piece of news. Yuan Shao had several thousand grain trucks arriving at Guandu. So Cao Cao sent troops to attack Yuan's army's grain transport troops, and burned all the grain and grass.

Yuan Shao learned the previous lesson, and sent the general Zhuo Yuqiong to lead more than 10,000 soldiers to escort the troops on the front line of grain and grass supply again, and stayed in the old city of Wuchao, forty miles away from Yuan Shao's camp. At this time, the strategist Xu You analyzed the current situation to Yuan Shao, believing that Cao Cao had few troops, and the main forces were all gathered in Guandu, and the rear must be empty, so he should send a force to directly attack Xu Du under the cover of night and control the Son of Heaven. In this way, Cao Cao can't take care of each other, and he will inevitably be broken by our army. But Yuan Shao, who was stubborn and self-serving, did not follow Xu You's advice, which made Xu You very annoyed. Don't talk about Xu You, whoever it is, everyone will be annoyed.

So, he realized that Yuan Shao would eventually be defeated by Cao Cao, so Xu You secretly left Yuan Shao. Surrendered Cao Cao.

This is a specific record in the historical records of Xu Yu's defection.

Xu Yu went to Cao Cao's place. He explained his analysis and solutions to the battle situation.

So what did Xu You propose to Cao Cao?

In fact, Xu You gave advice to Cao Cao and said: "Yuan Shao has more than 10,000 vehicles escorting grain and grass parked in the old city and the bird's nest, if you send a light army to attack them by surprise and burn the grain and grass, Yuan Shao and they will definitely be defeated." ”

As a result, Cao Cao was overjoyed when he heard this, and immediately adopted Xu You's suggestion.

So, Cao Cao made a quick decision. He personally led the light cavalry straight to Yuan Shao's granary black nest.

Cao Cao is also a very smart person. When attacking Wuchao, Cao Hong was ordered and Xun Yu was ordered to defend Cao Ying. Such an approach is a strategy that does not lose capital. And at the same time made a lot of money.

After Cao's army arrived at Wuchao, Zhuo Yuqiong, who was guarding the army's rations, hurriedly responded to the battle, and lost first in momentum. Zhuo Yuqiong couldn't resist it, and hurriedly complained to Yuan Shao. After Yuan Shao learned of this, he did not send troops to reinforce Zhuo Yuqiong, but thought that this was a good opportunity to seize Cao Cao's camp. So he sent Zhang He and Gao Ran to lead the main force to attack Cao Ying. Only a small group of light horsemen were sent to rescue the Black Nest. This was a decision made by Yuan Shao at the suggestion of the strategist Guo Tu.

Zhang He, Gao Ran attacked Cao Ying, and Cao Ying was well defended. Yuan Jun was broken for a long time. As for Cao Cao's side, Cao Cao led his troops through a bloody battle, burned the grain and grass of Yuan's army and killed the general Zhuo Yuqiong.

When Cao's army rushed to attack the base camp of Wuchao and Yuqiong, Yuan Shao's reinforcements were already approaching. When Cao Cao was in this tense battle, Cao Cao fought to the death, broke Yuan's army, killed Zhuo Yuqiong and others, and burned all his grain and grass.

So, there was another turning point: Zhang He turned his back.

Here's the thing. Zhang He was a general under Yuan Shao. is brave and strategic, and he also followed Yuan Shao when he was in Jizhou. Cao Cao was in a surprise attack on the Black Nest. Zhang He also advocated immediate reinforcements. On this point, Zhang He and Zhuo Yuqiong have the same opinion. However, Yuan Shao listened to the advice of the strategist Guo Tu, sent light troops to rescue Wuchao, and sent heavy troops to attack Guandu, so the result was as Zhang He expected, Guandu was not captured, and Wuchao was annihilated.

Guo Tu began to get nervous after the defeat. In order to shirk responsibility, he falsely accused Yuan Shao of Zhang He's gloating and disrespectful remarks. Zhang He was unfavorable in front at this time, and there was a fire in the backyard. At this time, he had to discuss with his subordinate Gao Lanyi, and finally decided to surrender to Cao Cao.

So Zhang He and his subordinate Gao Ran burned the chariot and surrendered to Cao Cao. After Cao Cao knew that Zhang He and Gao Ran had surrendered. overjoyed, and said that this is Han Xin's return to Liu Bang! The city gate was immediately opened to greet Zhang He and Gao Ran's troops. So he worshiped Zhang He as a partial general and sealed the capital pavilion.

Liu Bei fled, and Yuan Shao lost foreign aid; Xu Yu defected, and Yuan Shao lost his brainstorm; Zhang He turned his eyes, and Yuan Shao folded his arms. All of this shows that Yuan Shao's general trend has gone, and the next thing can only be annihilated and collapsed.

The situation was radically reversed in an instant.

So how did Liu Bei escape? The author would also like to add historical information about Liu Bei's escape from Yuan Shao.

In the days when Liu Bei and Yuan Shao fought together. It's definitely not going to be good. Liu Bei failed several times. This made Liu Bei even more convinced of the idea of leaving Yuan Shao.

When Yuan Shao and Cao Cao confronted each other in Guandu. Liu Pi of the Runan Yellow Turban Uprising opposed Cao Cao and joined forces with Yuan Shao. So, Yuan Shao sent Liu Bei and Liu Pi together to attack the surrounding areas of Xudu.

At this time, Guan Yu had already returned to Liu Bei's command. Cao Cao sent Cao Ren to crusade. Liu Bei was secretly planning to leave Yuan Shao at this time, so he found someone to persuade Yuan Shao, and proposed that he should join forces with Liu Biao in Jingzhou. So Yuan Shao sent Liu Bei to lead the troops to Runan.

Cao Cao sent Cai Yang to attack, as mentioned earlier. Cai Yang was defeated. After that, Cao Cao defeated Yuan Shao and personally went south, preparing to attack Liu Bei.

Liu Bei sent Mi Zhu and Sun Gan to meet Liu Biao. Liu Biao personally came to the suburbs, greeted Liu Bei with a VIP courtesy, and also provided him with soldiers and horses to be stationed in Xinye.

Since then, Liu Bei has taken refuge in Liu Biao. Left Yuan Shao.

Okay, no matter how Liu Bei escaped from Yuan Shao's side. Anyway, the battle of Guandu, Yuan Shao was going to be a complete failure.

As soon as Zhang He and the others surrendered to Cao Cao, Cao Cao immediately concentrated his forces on a large-scale counterattack according to Jia Xu's suggestion. At this time, Yuan Shao, who had rebelled against his relatives, completely lost his fighting spirit and fled to the north of the Yellow River with his eldest son Yuan Tan and hundreds of cavalry.

In the battle of Guandu, Yuan's army lost tens of thousands of soldiers and discarded a large number of weapons and baggage. Soon after, Yuan Shao, who was unwilling to fail, sent troops to attack Cao Cao again, but was defeated by Cao Cao, and in the end, Yuan Shao, who had been repeatedly defeated by Cao Cao, died of depression.

Later, the counties of Jizhou also raised the city and surrendered to Cao.

This was the end of the Battle of Guandu.

Looking back at the battle of Guandu, it can be divided into four stages. The first stage is the confrontation phase. Yuan Shao struck first. Attack Cao Cao. The second stage is the stalemate stage, which is when neither Cao and Yuan can open a war situation. A strategy was adopted.

The third stage is the transition stage. It is the aforementioned Liu Bei who escaped, Xu Yu who defected, and Zhang He turned against him. These three turning points.

The fourth stage is the decisive stage. It was after Cao Cao gained power that he launched a general attack on Yuan Shao.

Well, that's all for the Battle of Guandu. The Battle of Guandu can be said to have changed the balance of strength between Cao Cao and Yuan Shao. This made Cao Cao the most powerful warlord in northern China at that time. It laid the foundation for Cao Cao's basic unification of the north.

Moreover, the battle of Guandu had a very important influence on the formation of the situation of the Three Kingdoms. The Battle of Guandu was also one of the three major battles of the Three Kingdoms period, and it was a glorious battle in which Cao Cao won more with less. After the Battle of Guandu, Cao Cao made an expedition to the Wuhuan forces in northeastern China. And conquered the Wuhuan forces, so far, the war-torn north has finally been unified.

After the Battle of Guandu, Cao Jun captured Fu Zhi alive. Fu Zhu has always been deeply valued and loved by Cao Cao, and at first Cao Cao was willing to pardon Fu Zhu and be lenient to him. But in the end, Fu Zhu was killed by Cao Jun because he always wanted to return to Yuan Shao's camp.

Tian Feng's fate is also very tragic. After Yuan Shao was defeated, he fled back to the north with only 800 horsemen. I regret not using Tian Feng's words, but Feng Ji slandered Tian Feng. As a result, Tian Feng was killed by Yuan Shao.

Later generations also had a very high evaluation of the Battle of Guandu. The author will not list them all here.

At this point, the content of the Battle of Guandu is coming to an end. If you want to know more about the Three Kingdoms, please pay attention to the following content.