Is separated into the fortified wall of ancient China. Most of the current wall, built in the Qin Dynasty. This is to prevent abuse of the Hans. Or tribal Nice Young rats (xiongnu) The term is sometimes spelled as mice H Yong Sung mice.Zhuang mice was unpopular with the early Chinese civilization. Since the Zhou Dynasty (around 400 BC) due to cross-border incursions into northern China. In Qin dynasty period Mansion was instructed to build a wall along the border.I just left and the Turks invaded from the north. Then also creating a wall several times together. But later the nomadic tribes of Mongolia and Manchuria can be successfully broke through the Great Wall of China.