What does Guan Gong mean by sending his second sister-in-law?

Guan Yu sent his second sister-in-law, that is, Guan Yu escorted her to find her brother Liu Bei.

Guan Gong's farewell to Ersao is one of the plots in the classic novel Romance of the Three Kingdoms, one of the four classical novels in ancient China.

It mainly tells the story that Guan Yu and Liu Bei were separated, and Guan Yu was trapped in Cao Ying. Liu Bei went to Yuan Shao, and Guan Yu learned of Liu Bei's whereabouts, and rode alone to protect the two emperors and find their relatives and brothers thousands of miles away. Kong Xiu, Han Fu, Meng Ke, Bian Xi, Wang Zhi and Chyi Chin blocked them at five levels. Guan Yu was forced to go through five customs and behead six generals. Finally, in the ancient city, brothers, ministers and couples met. In opera, it is also called Gu Chenghui.

Extended data:

Chen Shou's Biography of Guan Yu, written in the Western Jin Dynasty, recorded: "It was Yu who killed Yan Liang, and Tsao Gong knew that he would go, so he was rewarded. Feather thanked him, said goodbye to Shu En, and ran to Yuan Jun first. When the left and right sides wanted to chase him, Cao Gong said, "Every man is his own master, so don't chase him. "

It can be seen that although Guan Yu searched for Liu Bei thousands of miles away, Cao Cao did not send troops to chase him out of ambition, nor did he set up checkpoints to stop him. This trip can be described as smooth sailing, so "riding a thousand miles" is true, but "going through five customs and cutting six generals" is just a fabrication in the Romance of the Three Kingdoms.