This is a passage from Chronicles of the Three Kingdoms, Book of Wei, and Records of Emperor Wu. Please translate the following paragraph~~~~~! !

When Cao Cao heard that Xu You was coming, he went out to greet him without even putting on his shoes. He clapped his hands and said with a smile: Ziyuan, if you are here, my big thing will be successful. Then he took his seat and Xu You said to Cao Cao: Yuan Shao's army is powerful. How does (Cao Gong) want to resist it? How much food does the army have now? Cao Cao said: It can still support one month's expenses. Xu You said: That's not it. Please revise it before speaking. Cao Cao said again: It can take half a year. Xu You said: Mr. Cao, you don't want to defeat Yuan Shao, why don't you tell the truth? Cao Cao said: What I just said was a joke. In fact, it can only be used for a month. What should we do in this situation? Xu You said, Mr. Cao, you are alone in fighting the enemy. There is no relief and assistance around you and the food grains are running out. This is a dangerous and urgent time. Now Yuan Shao's baggage of more than 10,000 vehicles is left in the old city, Wuchao, and the remaining army has no defense. Now use a brisk force to sneak attack there, arrive unexpectedly, and burn the food and grass they have accumulated. In less than three days, Yuan Shao will be defeated without a fight.