Later, Yuan Shaopa sent generals Yan Liang, Chunyu Qiong, Guo Tu and others to attack Ada, the satrap of Dongjun, in Baima. Xun You put forward the operational strategy of introducing from the east to the west and tapping the white horse. Cao Cao accepted Xun You's suggestion and personally led the army to rescue him. Yan Liang was frightened and hurried to fight. Cao Cao appointed Zhang Liao and Guan Yu as the vanguard (Guan Yu was still Liu Bei's servant at this time).
Guan Yu saw that Yan Liang might cover, rode to kill, stabbed Yan Liang to death among all the troops, drew his sword and beheaded Yan Liang, and then returned. No one can stop General Yuan Jun, the siege of the White Horse was solved, and Guan Yu was appointed as the Tinghou of Hanshou.
Extended data:
Before Guan Yu killed Yan Liang, Cao Cao worshipped Guan Yu very much. In order to know whether Guan Yu intends to stay long, he asked Zhang Liao to ask Guan Yu about his personal feelings. Guan Yu sighed to Zhang Liao: "I know Tsao Gong's deep love for me, but I was sworn to the death by General Liu Bei's great kindness, and I can't turn my back. I won't stay until the end, until I have made contributions to Tsao Gong. "
Zhang Liao worried that if he reported truthfully, it might lead to Cao Cao killing Guan Yu. So, Zhang Liao sighed for a long time, and finally understood that Cao Cao is your father, and he is a courtier. You can't give up your duties because of your brotherly relationship with Guan Yu. Finally, Zhang Liao truthfully reported Guan Yu's thoughts to Cao Cao. Therefore, Cao Cao praised Guan Yu: "A gentleman never forgets his roots, and a benevolent man is also in the world."
Cao Cao asked Zhang Liao to guess when Guan Yu would leave. Zhang Liao knew that Guan Yu was a kind person, so he vouched for Guan Yu: "If Guan Yu receives public kindness, he will make an effective report to the public and then leave." Knowing that Guan Yu was leaving, Cao Cao rewarded him and wanted to keep him. But later Guan Yu killed Yan Liang for Cao Jun, so Guan Yu sealed Cao Cao's reward, left a book, went north, defected to Yuan Shao's army, and returned to Liu Bei.