Huai'an is more than 300 miles away from Nanjing and is the northern gateway of Nanjing.

The governor of Caoyun in the Ming Dynasty was mainly responsible for transporting grain from the south to the north, supplying grain to the Beijing division and the northern border army.

After experiencing the early branch and redemption of transportation, the long-term transportation method became the final way of Cao Yun.

To put it simply, after the peasants harvest the grain, they only need to pile the grain in the field, and the soldiers in charge of the transportation will take the initiative to come to the field to collect the grain.

After harvesting, the grain will be transported to the canal wharf and sent to Beijing through the canal.

As the governor of Caoyun, Zhu Guobi had thousands of soldiers under his command.

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