The guardian of the people's Republic of China in the distant object created walls and Fortress Hill link notification lights on the border together to prevent invasions from the minority nationalities in the North.
Parents of the Great Wall of China at that time have built a fort and Fort Fire Alarm borders together to prevent the abuse of minority communities in the north.
Rulers of China during there build the wall welding fort and Fort fire alarm in the border region together to prevent the invasion of the minority people in the North