On the night of November 15th in the winter of the 13th year of Jian'an, the moon and stars were sparse. Cao Cao was composing poems on the warship, full of ambition. Shengzhang said to the counselors: "If it weren't for the destiny of heaven to help me, I would have had Fengchu's clever plan. The boat is connected with iron ropes, and crossing the river is like walking on flat ground." Cheng Yi said: "The boats are all chained, so they are stable. But if he attacks with fire, It is difficult to avoid and must be guarded against." Cao laughed and said, "Although Cheng Zhongde has foresight, he still doesn't know where to go." To attack with fire, we must rely on the power of wind. It is the middle of winter, but there is a west wind and a north wind, and there is an east wind and a south wind. I live in the northwest, and they are all on the south bank. If they use fire, they will burn their own soldiers. Why should I be afraid! If it were spring in October, I would have prepared it in advance!" It can be seen that Cao Cao has fully considered the time and location.

Zhou Yu used Pang Tong to propose a chain plan to Cao Cao. At first, he thought there would be no problem with attacking with fire. However, when he stood on the top of the mountain on the south bank and watched Cao Cao's water village, a strong wind suddenly came up, waves in the river crashed on the shore, and a gust of wind Then, the horn of the flag blew across Zhou Yu's face, and he suddenly realized: This season there is only west wind and north wind, and there is no south wind or east wind. How can we attack with fire? So he suddenly looked back and fell down,

Vomiting blood at the mouth and unconscious. From then on, I was bedridden and really worried.

Zhuge Liang went to visit, retreated to the left and right, and wrote sixteen characters in a secret note: "If you want to defeat Duke Cao, you should attack with fire. Everything is ready.

All you need is the east wind." After finishing writing, he handed it to Zhou Yu and said, "This is the source of the illness of the governor." Yu was shocked when he saw it, and thought to himself that Kong Ming, the true god and man, had already known what was on my mind, so he could only tell the truth. Nai smiled and said: "Sir, if you know the source of my illness, what medicine will I use to treat it? If the matter is critical, I hope you can teach me immediately." Kong Ming said: "Although Liang is not talented, he once met a strange person who taught him the Eight Gates Dunjia Heavenly Book, which can control wind and rain. Governor If the wind blows from the southeast, you can build a platform on Nanping Mountain, called the Seven-Star Altar, which is nine feet high and has three floors. There are 120 people holding flags and flags surrounding it, and they will perform the ritual for three days. Night, only one night of strong wind can accomplish great things! But the matter is now, don't delay. "Kong Ming said: "On November 20th, Jiazi worships the wind, and how will the wind stop at Bingyin on the 22nd?"

Hearing this, Yu was overjoyed and stood up. Then he sent an order to send 500 strong soldiers to Nanping Mountain to build an altar and 120 people to hold flags and guard the altar, waiting for orders.

Kongming then took a bath and fasted on the auspicious day of Jiazi on November 20th. He was clothed in Taoist robes, barefooted, went up to the altar and began to perform rituals to worship the wind. Kongming went up to the altar three times a day and came down three times a day, but there was no southeast wind. That day, I saw that it was almost night, the sky was clear and the breeze was still. Until nearly the third watch, I suddenly heard the sound of wind and the flags and flags were turning. When Zhou Yu went out to take a look, the flag ribbon was floating to the northwest. Suddenly the southeast wind picked up. When the southeast wind picked up, Zhuge Liang had already left the altar and came to the riverside. He took the boat that Zhao Yun came to pick up, left Zhou Yu's camp, and returned to Xiakou where Liu Bei was.