[Explanation]: Fortified wall: strong barrier; Clear the wilderness: Clear the countryside. A way to deal with the invasion of a strong enemy.

So that the enemy can neither capture the stronghold, but also unable to grab supplies. [Idiom story]: At the end of the Eastern Han Dynasty, Cao Cao occupied the Yanzhou region after suppressing the Huangzhong Rebellion, and then marched eastward, preparing to seize Xuzhou.

However, Yanzhou Haoqiang Zhang Miao, colluded with the separatist force Lu Bu, attacked most of Yanzhou, and occupied the important place of Xiangyang.

Cao Cao hurriedly withdrew his troops from Xuzhou and launched a counterattack against Lü Bu, who was stationed in Xuyang. Lu Bu was very fierce, and the two sides held each other for a long time, and Cao Cao could not win for a while.

Soon, Tao Qian, the general of Xuzhou, fell ill and died, giving Xuzhou to Liu Bei. Cao Cao's mood for Xuzhou was even more urgent, and he wanted to take Xuzhou and then eliminate Lü Bu.

Cao Cao's advisor Xun or, forgive Cao Cao not to rush into Xuzhou, lest Lu Bu take advantage of the situation. He said: "It is now the wheat harvest season, and it is reported that Xuzhou has organized manpower to step up the harvesting of wheat outside the city and transport it into the city, which shows that they are prepared for a possible war." After harvesting all the wheat, the other side will inevitably strengthen the fortifications, retreat the residents of the four fields, and transfer grain, grass and materials. So that the army will not be able to gain a foothold when it reaches there; The other side used the method of 'fortifying the walls and clearing the wilderness' to deal with us, and at that time, the attack could not be overcome, the plunder was nothing, and within ten days, the whole army would collapse without a fight

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