Chapter 42: Speed is the only way to success

Zhending is a big city. Zhu Gaoxu looked south from the army and saw the vast plain stretching as far as the eye could see. The eye-catching towers and walls were even more eye-catching. He didn't know the exact size of the city, but he estimated that the circumference was at least 20 miles! The city walls were all made of earth, but Zhu Gaoxu knew that this kind of rammed earth wall had a trapezoidal cross-section, with little difference in thickness and height. It was very solid, nearly ten meters thick, and almost impossible to penetrate.