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简介：Ding Qirui's task was to occupy Qixian County, and then use Qixian County as the core and extend to both sides to dig a large trench three feet wide and one foot deep to cut off the possible escape route of the camp from the east. Of course, the longer the excavation distance, the better. The minimum standard the prince set for them was forty miles, which covered most of the route from Kaifeng to Qixian.