Regardless of how tall any city wall in the world is built,
in the face of Daoist martial artists who can fly, the wall cannot truly be called a great barrier.
A city wall made of primitive stone and green bricks is laughable. In the eyes of the strong, it's no tougher than a piece of thin paper. However, addressing ordinary people's need for safety is always the top priority.
This leads to the painstaking effort to construct cities during the re-establishment of every dynasty.
Besides the grand strategy of keeping enemies out of the country, the most reassuring thing for the people is the continuous strengthening of the defense of cities within the country. It's a kind of reinforcement that even ordinary people would feel secure to see.
Every time a new county official takes office, they would work on city defense.
As a result, all of the cities with some history in the Great Zhou, have their city walls built incredibly high!
