Why did Guan Yu lose Jingzhou because of his carelessness?

Because of Guan Yu's carelessness, pride and underestimation of the enemy.

The loss of Jingzhou carelessly refers to the allusion of the famous general Guan Yu losing the three counties of Jingzhou (Nanjun, Wuling, and Lingling) during the Three Kingdoms period.

After the Battle of Chibi, the seven counties of Jingzhou were divided between Liu Bei, Cao Cao, and Sun Quan. Liu Bei entered Shu (Sichuan), leaving Guan Yu to guard the five counties of Jingzhou (Nanjun, Changsha, Lingling, and Guiyang). , Wuling), among which Nanjun was borrowed by Liu Bei from Soochow.

After Liu Bei obtained Shuchuan, he returned Changsha and Guiyang counties to Sun Quan (equivalent to returning Nanjun).

Later, Guan Yu sent troops to attack Cao Cao's Xiangfan area. Sun Quan sent Lu Meng to take advantage of the opportunity to attack the three counties of Jingzhou (Nanjun, Wuling, and Lingling) and fell, causing the three counties of Jingzhou to fall. Being careless and losing Jingzhou is now a metaphor for failure or loss due to carelessness. It means carelessness, pride and underestimation of the enemy. Extended information

Liu Bei sent Guan Yu to guard Jingzhou and went to Shu to fight. After capturing Hanzhong, Guan Yu's Jingzhou side also actively cooperated and captured Xiangyang, the gateway to the Central Plains, to the north. Cao Cao quickly sent troops back to Xiangyang to aid, but Guan Yu came and flooded the Seventh Army, which shocked China, and the Shu army quickly Occupied Xiangyang.

At this time, Xiangyang, the gateway to the Central Plains, has been opened and is approaching the Central Plains. Shu has also captured Hanzhong, threatening the pass. Liu Bei's strength has reached its peak and he is still the largest force among the Three Kingdoms. Cao Cao was therefore preparing to move his capital to avoid his influence.

But unfortunately, Cao Cao and Sun Quan quickly formed an alliance to attack Jingzhou. Due to problems with the people Liu Bei left in Jingzhou, Guan Yu was attacked from both sides and had no reinforcements.

The picture shows the Shu Han after completely losing Jingzhou (the brown part was occupied by Zhuge Liang later). Liu Bei lost two brothers one after another, and then lost his gate Jingmen, which was a huge blow.

In order to recapture Jingzhou, Liu Bei used "Xue's brother's hatred" as an excuse to mobilize 750,000 troops from Shu to conquer Wu. As a result, he was completely defeated by a fire, and Liu Bei was almost caught on the way to retreat, but was rescued by Zhuge Liang.

Baidu Encyclopedia--Lost in Jingzhou