Is it true that Guan Yu absolutely showed his great power on the North Road and fought against the five generals in Cao Ying by himself?

It's true, but we didn't beat them, we just had a fight with them. According to the later development, Liu Bei's decision to block Guan Yu in the North Road was an unlikely strategic plan, and the result of the battle between Guan Yu and the five generals was not very good.

After Battle of Red Cliffs, Cao Cao fled because of defeat. In order to prevent Coss from getting help, Liu Bei sent Guan Yu to North Road. In fact, this military strategy is wrong. Although Guan Yu was very powerful, he had to face five generals, including Le Jin, Man Chong, Wen Pin, Huang Xu and thomas lee. The defense of the five of them was in a line, and Guan Yu had to touch it. Moreover, the story of Guan Yu's refusal to go north is rarely recorded in the history books, and obviously the disgraceful deeds will not be recorded in this biography, so it can probably be guessed that Guan Yu's refusal to go north was a failure.

After Battle of Red Cliffs, Cao Cao assigned five people very well, with Coss Huang Xu guarding Jiangling, Lejin guarding Xiangyang, Man Chong guarding Jiangling and Xiangyang, Wen Pin guarding Jiangxia and Li Tong guarding Runa. Even so, Coss failed. Although Le Jin saved Coss and defeated Guan Yu. However, several others did not have the upper hand in the struggle with Guan Yu. Although Guan Yu's previous deeds, such as beating Hua Xiong with warm wine, showed Guan Yu's bravery and good martial arts, Guan Yu would not be defeated by beating five people all the way. Due to incomplete historical records, we can't know the details of Guan Yu's North Road in any case. We can only speculate from the later results that Guan Yu did not get away with it, nor did Coss defeat Guan Yu.

So the story of Guan Yu beating five people by himself is true, but he didn't succeed. Both sides lose, which is a wrong military strategy.