The great wall of China was built to keep nomadic tribes from invading. It was built during the Ming Dynasty and helped them defend against the Mongol and Manchu invasions.
the military construction project was built at different times to preserve the mainland from nomadic tribes' invasion at ancient northern frontier. The existing Great Wall remains mainly built in the 14th century the Ming dynasty, began in the Warring States period(300~400BC).
the military construction project was built at different times to preserve the mainland from nomadic tribes' invasion at ancient northern frontier. The existing Great Wall remains mainly built in the 14th century the Ming dynasty, began in the Warring States period(300~400BC).