三面积公式计算公式

简介：A bastion for 500 people, with a radius of 200 paces, costs about 20,000 taels of silver, and can be built in three months with 5,000 civilians. As for the effectiveness, I have already said that if Jianlu wanted to capture it, he would have to pay three to five times the casualties. Zhu Cihong said.