Why was Wu Song named a tiger-fighting hero?

Wu Song said goodbye to Song Jiang and returned to Li, passing by Jingyanggang on the way. I drank eighteen bowls of wine in a hotel. When I passed the post drunk, I learned that there was a tiger. At this time, the tiger jumped out, Wu Song fought back and beat the tiger to death. Wu Song went home to visit his brother and passed by Jingyanggang on the way. I drank a lot of wine at the Gangxia Hotel and staggered towards the Gangshang. Not much happened, but I saw a writing on a tree: "The big insect in Jingyanggang has recently hurt people, but there are merchants passing through the hillock, so they should cross the hillock in groups, so don't make any mistakes." Wu Song believed that this was written by the restaurant. The one who came to scare people was to let passers-by stay in his shop, but he ignored it and continued to move forward. When the sun was about to set, Wu Song came to a dilapidated temple and saw a government notice posted on the temple door. After Wu Song read it, he learned that there was a real tiger on the mountain. When he was about to go back to the hotel, he was afraid of the store's joke, so he continued to move forward. Due to the effect of alcohol, he found a large bluestone and lay down on his back. Just as he was about to fall asleep, he heard a strong wind howling and a beautiful tiger rushed towards Wu Song. Wu Song hurriedly dodged and hid behind the tiger. As soon as the tiger jumped, Wu Song dodged again. The tiger got anxious, roared, and hit Wu Song with its tail. Wu Song jumped away in a hurry, and when the tiger turned around, he raised his whistle stick, exerted all his strength, and hit the tiger's head hard. Just a "click" sound was heard, and the whistle stick hit the branch. The tiger became more animalistic and rushed towards Wu Song again. Wu Song threw away half of the stick and rode on the tiger's back. He grabbed the skin of the tiger's head with his left hand and hit the tiger's head with his right hand. Soon, he beat the tiger's eyes, mouth, and His nose and ears were bleeding everywhere, and he lay on the ground unable to move. Wu Song was afraid that the tiger would pretend to be dead, so he raised his half-whistle stick and beat him for a while. When he saw that the tiger was really out of breath, he stopped. From now on Wu Songwei