Was the abnormal east wind in the Battle of Chibi really borrowed by Zhuge Liang?

Not borrowed.

The Battle of Chibi is an example of the weak defeating the strong in ancient history. At the end of the Eastern Han Dynasty, Cao Cao unified the north and led his troops south. Sun and Liu allied 50,000 troops to resist the forces of Cao Wei who were going south. Cao Jin entered Chibi, but the small battle ended in defeat. He retreated and stationed in Jiangbei, confronting Sun Liu across the river. Sun Liu took advantage of Cao's army's fatigue, unaccustomed to water warfare, unstable rear and other related weaknesses, and adopted a fire attack to defeat Cao Wei's navy.

In the thirteenth year of Jian'an, Cao Cao led his troops to conquer Jingzhou southward. In August, Liu Biao died and Liu Cong succeeded to the throne and garrisoned Xiangyang. Liu Bei defended Fancheng; in September, Cao Cao led his troops to Xinye. Liu Cong deceived Liu Bei and surrendered to Cao Cao without a fight. Liu Bei withdrew south, and Cao marched to Jiangling, hoping to conquer the south of the Yangtze River. In October, Zhuge sent an envoy to Jiangdong, and Sun Quan allied with Liu to fight against Cao. He ordered Zhou Yu and Cheng Pu to serve as the left and right governors, and Lu as the captain of the Zan Army. They joined Liu and arrived at Chibi; Around January to December, Sun Liu fought with Cao's army in Chibi, and Cao's army was defeated and retreated to the Wulin area. A large-scale epidemic occurred in Cao's army. More than half of his soldiers were killed or injured, and his warships were connected. Huang Gai burned Chibi and destroyed the power of Cao Wei. Cao returned from Huarong Road.

The victory in the Battle of Chibi was not only Zhou Yu, but also Zhuge Liang. The straw boat borrows arrows and the east wind is a familiar story. Zhuge Liang advised Zhou Yu's army and knew the cause of Zhou Yu's illness, so he prescribed a "prescription": "To defeat Cao's army, all we need is the east wind. Where does the east wind come from? In fact, Zhuge Liang is good at predicting the weather. He knows when the southeast wind will blow through the forecast. , it is not "borrowing" at all. It is just the practice of Zhuge's meteorological knowledge. How did Zhuge Liang know that the wind would blow from the southeast?

In the middle reaches of the Yangtze River, the land cools down. The speed is greater than that of the ocean, and cold high pressure is formed in central Asia, such as the Siberian High. The northwest wind should prevail in Chibi at that time. It is not impossible that southeasterly winds blow in the middle reaches of the Yangtze River in winter: the atmospheric movement is complicated, and small winds appear in the west of Chibi. Low pressure. The low pressure in the northern hemisphere is a cyclone, which flows counterclockwise, blowing southeasterly winds.