The Mongols' Invasions And Zheng-luo's Military Campagin In Ming Dynasty

There are many Tibetan tribes living in Shannxi,Gansu and Qinghai in the northwest of China.Their history could be referred back to the Tang Dynasty in the 8^th century.Although some of the Tibetan leaders founded their short-lived independent political powers during the Northern Song Dynasty,they were dispersed and were later under the control by the central government.At the beginning of the Ming Dynasty,the Tibetan tribes rapidly appealed to the new reign,and stationed at the frontier areas as defender.This relatively peaceful situation was disrupted by the Mongols in the 15^th century.Due to the chaotic situation caused by war,some Mongolian leader escaped to Qinghai and eventually controlled the Tibetan tribes with their strong and experienced military strength.They even had conflicts with the Ming army.In 1590, Zheng-luo,as the highest regional commandant in Shannxi,Gansu and Qinghai,came to Qinghai and expelled the Mongolian from the area together with the Tibetan tribes.And finally the region became stable again until the collapse of the Ming Dynasty.