What does Guan Yunchang's failure in Maicheng mean?

A summary of the story of Guan Yunchang's defeat in Maicheng;

Guan Yu intends to defeat Cao in Jingzhou. Wu took advantage of the surprise and attacked Jingzhou (now Jiangling). When Guan Yu came back to save Jingzhou, his troops were insufficient, and Cao Jun's reinforcements had arrived. Guan Yu did not recapture Jingzhou, but was sandwiched between Cao Sun's family and Cao Sun's family, so he led down archers to retreat to Maicheng. Recently, reinforcements arrived, and Commander Liu Da chose not to save them (in fact, there was no army, so he could take them in), so Guan Yu was wiped out.

Judging from the Romance of the Three Kingdoms, the seventy-sixth time Xu Zhanmian Shui, Guan Yunchang defeated Maicheng. Maicheng is located in Lianghe Township, dangyang city, more than 20 kilometers away from Pingyang Town. In the Eastern Zhou Dynasty, it was an important city of Chu, and in the eighteenth year of Emperor Yangdi (AD 593), it was a county seat. "Tongzhi of Qing Dynasty Dangyang County Records" records: "Maicheng was built by King Chu Zhao, which is five miles southeast of the county, between Zhang Ju and Ershui. During the Three Kingdoms, Guan Yu was attacked by Sun Quan, and this was the case in Xibao Maicheng.

It means:

1. Go to Maicheng to describe the defeat.

2. In the 24th year of Jian 'an in Han Dynasty, Guan Yu, the general of Shu State, was stopped by the general of Wu State when he defeated Maicheng, and was beheaded in Linzhou. Later, it was called "going to Maicheng" and it was desperate.