Kaifeng City is easy to defend but difficult to attack because it has experienced floods over the past dynasties, and the rulers of each dynasty have been forced to thicken and raise the city walls.
Especially during the Ming Dynasty, when industry was developed, Kaifeng City had high walls built internally and deep trenches dug externally.
The most exaggerated part of Kaifeng city wall is that it has five overlapping layers of walls!
Therefore, the Xia army’s artillery was difficult to destroy, and explosives were not effective, but at the moment they were unable to prevent the internal support from within the city.
It was the first time that Xia Jun's airborne "special forces" engaged in actual combat, and the effect was extremely good, mainly because of the surprise attack. With the support of the people in the city, it didn't take long for them to open the city gate.
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