What is the story of Cao Cao building a dirt city on a cold night?

This story happened in AD 2 1 1 year. Cao Cao led an army to the west to explore the Han and Sui Dynasties and confronted Ma Chao in front of Tongguan. Thinking that his troops were ahead of Cao Cao in Ma Zhuang, he wanted to defeat Ma Chao in one fell swoop. Unexpectedly, Ma Chao was unusually brave, and the soldiers he led were even more brave and good at fighting. Cao Jun was defeated, suffered heavy losses and was greatly weakened. Cao Cao had to clean up the remains and cross the Weihe River to reach the north shore. However, there is no ready-made city near the north shore to camp, Ma Chao may attack at any time, and Cao Jun without camp will be vulnerable. To this end, Cao Cao was anxious and worried.

At this time, one of Cao Cao's aides suggested to him, "Prime Minister, we can take the soil of Weihe River and build a dirt city." Cao Cao felt justified, so he mobilized 30 thousand soldiers and horses to borrow soil to build a city. However, the soil of Weihe River is full of sediment. As the saying goes, sand can build a tower, but it only takes three feet. The sand in the Weihe River is too loose to build a wall. Coupled with the frequent harassment of Ma Chao's military forces, Cao Cao was anxious day and night.

At this time, another hermit named Lou Zibo asked for an audience and said to Cao Cao, "The Prime Minister has been trying to build a city and camp. Why are you so slow? " Cao Cao sighed: "This place is full of sand, and the earthen city collapses with the construction. How can it be built? " ? What do hermits think? "LouZiBo said with a smile," the prime minister has always fought like a god. Don't you know the weather changes? It is cloudy these days, and there will be a north wind tonight. When the north wind blows, the weather will be particularly cold. If you build a city with Weihe mud, use it to freeze it. "

Cao Cao immediately frowned and stretched himself, and immediately ordered the soldiers to get everything ready. That night, as expected, the north wind blew hard and the temperature plummeted. Cao Cao was overjoyed and braved the cold to order all the soldiers to borrow soil to build a city. They piled up soil and watered it, freezing it layer by layer. At dawn, the tucheng has been built. Ma Chao's spies saw that Cao Cao's tucheng stood tall, and immediately reported to Ma Chao. Ma Chao went to see it himself and was taken aback. He thought, how did you turn into a tucheng overnight? Could there be a god helping him?

This is the detailed process of Cao Cao's building a earthen city on a cold night.