Zhang Fei opposed Guan Yu's knife because he thought Guan Yu had surrendered to Cao Cao and betrayed brotherhood. This story about the ancient city war is very thrilling. At that time, when Zhang Fei saw his second brother Guan Yu, he was furious and wanted to kill him. Guan Yu was frightened and quickly stepped aside. ?
But things in the world, where it is clear in a few words, Guan Yu has a secret. Guan Yu really surrendered to Cao Cao. After the defeat of Pibing, Guan Yu was surrounded by Cao Cao, who sent Zhang Liao as a lobbyist. Guan Yu had to agree to surrender, but he agreed with Cao Cao on three things: first, Guan Yu surrendered to the Han emperor and did not surrender to Cao Cao. The second is to ensure that Liu Bei's two wives have food and wages. Third, once he knows the whereabouts of his eldest brother Liu Bei, Guan Yu will go all the way to find him. Cao Cao was eager to love talents and agreed. Cao Cao treated Guan Yu very deeply, and gave him a robe, a red hare and ten ladies-in-waiting, a small banquet for three days and a big banquet for five days. Emperor Wu of the Han Dynasty visited his temple, praised him as a "bearded man" and named him the Pavilion Hou of Hanshou.
But Guan Yu was always in Cao Cao's heart, so when he heard the news of his eldest brother Liu Bei, he immediately abandoned Cao Cao. Guan Yu arrived in the ancient city of Runan and happened to meet Zhang Fei.
Zhang Fei always thought that Guan Yu had betrayed the friendship of Taoyuan and surrendered to cao thief, so he stabbed Guan Yu at the sight. Guan Yu personally beheaded Cai Yang to show his sincerity to Zhang Fei. Zhang Fei realized that he had wronged his second brother, so he wept bitterly with Guan Yu and invited him into the city to entertain Guan Yu. Then they went to Liu Bei, and finally the two brothers met to bury the hatchet.