Why did Guan Yu, who was all-powerful and brave, lose in the "Xiangfan War"?

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In 2 19 AD, Guan Yu conquered Wei and besieged Fancheng, which was flooded by the seven forbidden armies, which greatly shocked China. At this point, Cao Cao and Sun Quan formed an alliance to jointly attack Guan Yu. Guan Yu and Huang Xu were defeated in the battle, and Jingzhou was attacked by Lv Meng. He told them not to call the ground invalid every day, but to retreat to Maicheng and wait for reinforcements. But he didn't wait for reinforcements, so he could only lead the Guan Pingren to break through Maicheng. Unfortunately, Ma Zhong was captured by the Pan Zhang Department of Soochow. Finally, Guan Yu was captured and killed, so Guan Yu, who was extremely brave, was defeated in the "Battle of Xiangfan" for the following two reasons.

First of all, Huang Xu, the second reinforcement, knew all about Guan Yu and shook the morale of Guan Yu's army.

In the battle of Xiangfan, Huang Xu, as the second reinforcements, rushed to Fancheng and was besieged by Coss. In the romance, he led 50,000 new recruits, attacked Guan Yu's troops, broke more than a dozen of his garrisons, defeated the arrogant Guan Yu, and solved the siege of Fancheng.

Huang Xu is not only good at martial arts, but also good at strategy. He made full use of all available conditions to create opportunities for his own victory and victory. For example, Guan Yu in this war, Huang Xu first recalled with Guan Yu and described the ups and downs of these decades respectively. When we met again, Guan Yu was already white-haired. He used this to reduce Guan Yu's vigilance and kill Guan Yu's fighting spirit. After hearing this, Guan Yu caught up with Huang Xu like an old friend. Huang Xu suddenly changed his face, looked back at the generals and said loudly, "If you win the head of the cloud, you will be rewarded with 1000 silver!"

Guan Yu was surprised to hear that. He was surprised at why Huang Xu said so. Huang Xu also plausibly said that today is business, and he dare not neglect his private affairs. Guan Yu was furious and lost his standard. He was captured by Huang Xu and fought for more than eighty times. Earlier, Huang Xu deliberately revealed to Guan Ping the military secrets of Wu Dong's joint attack on Jingzhou with Cao Cao, just to shake the morale of Guan Yu's army.

Second, Wu Dong treacherous, Lv Meng white crossing the river, surprise attack Jingzhou.

After Guan Yu flooded the Seventh Army, Cao Cao joined forces with Sun Quan of Soochow to seize Jingzhou. In order to complete the task of Sun Quan, the marquis of Wu, Lv Meng pondered hard, and he was helpless in the face of the beacon tower set by Guan Yu. It's difficult to come up with a surprise without disturbing Jingzhou, which makes Lv Meng very uncomfortable. At this time, Lu Xun visited the sick Lv Meng and made a plan for him to cross the river in white. On the pretext that Lv Meng was ill, he asked Sun Quan for sick leave to recuperate and paralyze Guan Yu.

Half-truth and half-falsehood, Lu Meng asked Sun Quan for sick leave and handed over the intersection to the young general Lu Xun. In order to succeed, he confused Guan Yu and made a fool of himself. He's really sick. Guan Yu received a spy and knew that Lv Meng was not pretending to be sick, but really could not lead troops to fight. Replaced by a little-known Lu Xun, he sent Jingzhou's left-behind troops to the front to strive for greater victory. At this time, Jingzhou was empty, and Lv Meng was able to cross the river in white, successfully capturing Jingzhou and capturing the nine counties of Jingxiang without bloodshed.

Summary: Guan Yu, who had a great influence on China, was defeated by Cao Cao and Sun Quan. Finally, Guan Yu didn't capture Fancheng, even lost Jingzhou, and was beheaded himself.