Kong Ming skillfully used the story of the weather by using the two-part allegorical sayings of Dongfeng.

During the Three Kingdoms period, there was a story about Zhuge Liang borrowing from the east wind, which is still circulating among the people in China. This story happened in the 13th year of Jian 'an (AD 208) in ll month. At that time, Cao Cao led an army of 500,000, claiming to be 800,000, to attack Sun Quan. Sun Quanbing was weak. He joined forces with Liu Bei, Cao Cao's enemy, with a strength of only 30,000 to 50,000. He had to rely on the natural barrier of the Yangtze River and refused to defend the south bank of the Yangtze River. In October this year, the allied forces of Sun Quan and Liu Bei met Cao Cao's vanguard troops in Chibi (now Puyi County, Hubei Province). Cao Jun was mainly a soldier in the north, and he didn't learn water warfare. Many people will get sick. The corrosion rate is very low. As soon as the two armies came into contact, Cao Cao suffered a small defeat. Cao Cao was forced to return to the north bank of the Yangtze River and stationed in Wulin (now Honghu County, Hubei Province) to confront the allies across the river. In order to reduce the turbulence of the ship, Cao Cao ordered craftsmen to connect the warships and lay boards on them. In this way, the hull is much more stable and people can walk and ride horses on it. This is the so-called "serial warship", which Cao Cao thinks is a good way to cross the river. However, the "serial battleship" has a large target and is inconvenient to move. So remind Cao Cao to beware of Wu Jun's fire attack. Cao Cao, on the other hand, thought: "Anyone who attacks it with fire will use the east wind to make it in the middle of winter, but there is a northwest wind, so there is a southeast wind." I live in the northwest, and all my soldiers are on the south bank. If he uses fire, he will burn his own soldiers. what can I do? If it were in the spring of October, I would have been ready. "Zhou Yu also saw this problem, but due to unfavorable weather conditions, he was so anxious that he vomited blood and was unconscious." "Zhuge Liang, Liu Bei's strategist, revealed Zhou Yu's purpose with a phrase" something unexpected happens in the sky "and wrote the words 16 in secret:" If you want to break Tsao Gong, attack him with fire; Everything is ready except the east wind. "It can be seen that Cao, Zhou and Zhuge have the same understanding of fire attack conditions. Zhuge Liang, who lives in Nanyang (now near Xiangyang, Hubei Province) not far from Chibi, has a deeper and more specific understanding of the weather and climate laws around Chibi than Cao and Zhou. The northwest wind is only a climate phenomenon, and the east wind can appear under the climate background, which is a weather phenomenon. In military meteorology, in addition to climate laws, weather laws must also be considered as a supplement. At that time, Yan accurately predicted the time of easterly wind based on the analysis of weather and climate change and her own experience. However, in order to fool Zhou Yu, he set up an altar to worship God. 1 1 One night, the southeast wind really blew, and the wind was very strong. Zhou Yu sent Huang Gai to lead a fire attack fleet and sailed straight to Cao Jun water town, pretending to surrender. The ship was loaded with reeds and dry wood soaked in oil, covered with a curtain, and with a flag in the bow. At the forefront are ten attack ships. Ten ships sailed to the middle of the river. Huang Gai ordered all the ships to sail, so the fleet moved faster and gradually saw the water town of Cao Jun. At this time, Huang Gai ordered the soldiers to shout in unison: "Huang Gai is down! "The officers and men of Cao Ying heard that Huang Gai was coming, and they all craned their necks to watch. Cao Bing couldn't tell the truth from the false, and he was unprepared. Huang Gai's fleet is only two miles away from Caocao Water Village. Then Huang Gai ordered "set fire!" Commanded, all the warships fired together, just like a fire dragon, heading straight for the water town of Cao Jun. The southeast wind blew harder and harder, and the fire borrowed from the wind, which fueled the fire, and all the water towns in Cao Jun caught fire. The "serial warship" can't be dismantled for a while, and the fire can't be put out. It burns bigger and bigger until it reaches the river bank. I saw flames dancing and candlelight flickering, and Cao Jun's camp on the river and the bank was in flames. Sun and Liu Lianhe got up, wiped out Cao Cao's great troops and burned all the warships ... In the fireworks, Cao Cao led the defeated troops to retreat to Huarong (now northwest of Jianli County, Hubei Province). Unexpectedly, there was another storm on the way, and the road was muddy and difficult to walk. Cao Cao had to order all the old and weak soldiers to find branches and weeds and spread them on the muddy road to let the cavalry pass. But those old, weak and sick soldiers were crushed, trampled and died a lot. Later, he had to leave some troops to defend Jiangling and Xiangyang and lead the remnants back to the north.