Introduction to the border town military experience area: Until the end of the Yuan Dynasty and the beginning of the Ming Dynasty, Guizhou was still ruled by more than 100 so-called "hereditary" chieftains. In the eleventh year of Yongle (AD 1413), the Ming court decided to abolish the "Sand Pit War" caused by the two chieftains of Sinan and Sizhou over the cinnabar mines in Tongren and Wanshan. The Second Xuanwei Division implemented the new policy of converting "Tu" to "Liu", and divided the 39 official divisions under its jurisdiction and one prefecture and one county into eight prefectures including Tongren, appointed Liu officials to govern, and established "Guizhou and other departments to take over the announcement" The "Secretary of Political Envoys" (the Thirteenth Chief) was in charge of the eight governments and the existing three prefectures. From then on, Guizhou became a province of the country and was directly under the management of the central government. A new chapter for comprehensive cultural integration. After Guizhou was established as a province, fourteen general military offices were stationed in Tongren, and the famous southern Miao Border Wall (Southern Great Wall) also started from Tongren.