Nine sides
Nine, also known as the nine towns, is the Ming Dynasty Hongzhi years in the northern border along the Great Wall defense set up nine military centers, namely Liaodong town, Jizhou town, Xuanfu town, Datong town, Taiyuan town (also known as Shanxi Town or three town), Yan Sui town (also known as Yulin town), Ningxia town, Guyuan town (also known as Shaanxi town), Gansu town. ...