Lü Kuang's surrender to Cao was around the tenth day of the first month of June, and then Cao Cao passed the entire territory of Qinghe County and Anping County, and it was late June when he finished all this.

It was already early July when he returned to the division to completely surround Yecheng and began to prepare for digging ditches and flooding the city.

Cao Ying's high-level leaders also knew in their hearts: as long as the water attack strategy was successful, Yecheng would not be able to last for three or five months, and it would definitely be able to break through after winter at the latest.

In history, Cao Cao besieged Yecheng for so long because

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