When Guan Yu attacked Fancheng, he was shot in the right arm by a poisonous arrow. The soldier took out the arrow and saw that the poison had penetrated into the bone, and advised Guan Yu to go back to Jingzhou for treatment. Guan Yu was determined to capture Fancheng and refused to retreat. Seeing that Guan Yu's arrow wound was getting worse and worse, the soldiers sent people around to inquire about famous doctors. One day, someone came to the front of the village by boat from the river and introduced himself as Huamingtuo, specially to treat Guan Yu's injury. Guan Yu asked Hua Tuo what he thought. Hua Tuo said, "I'm afraid you're afraid. I'll set up a post, hang a ring on the post, put your arm in the ring, tie it with a rope, then blindfold you and operate on you. " Guan Yu smiled and said, "No need to tie it." Then he ordered a banquet in honor of Hua Tuo. After a few drinks, Guan Yu played chess with others. At the same time, he extended his right arm to Hua Tuo and said, "I'm not afraid of anything you want." Hua tuo peeled and scraped the bone with a knife. People present covered their eyes with their hands in fear. Look at Guan Yu again, drink and play chess. After a while, a basin of blood flowed and the poison on the bone was scraped off. Guan Yu stood up with a smile and said to the generals, "My arms are as free as before. Mr. Hua Tuo, you are a great doctor! " Hua Tuo said, "I have never seen such a great person as you since I practiced medicine. The general is a god. "