In 215 BC , Qin Shi Huangdi ordered Request General Meng Tian to set out Military_operation against the Xiongnu tribes in the Ordos region , and establish Building a frontier region at the loop of the Yellow River .

Later in the year , Meng Tian succeeded Conquering in defeating Conquering the Xiongnu , driving Hold them from the Ordos and seizing Hold their homeland .

After the catastrophic defeat Conquering at the hands of Meng Tian , the Xiongnu leader Touman was forced Hostile_encounter to flee Escaping far north into the Mongolian Plateau .

Meng Tian was instructed Request to secure Preventing_or_letting the frontier with a line of fortifications , which would become Becoming known as the Great Wall of China .

Crown Prince Fusu and General Meng Tian were stationed Placing at a garrison in Suide and soon began Process_start with the construction of the walled defenses Defending , which would be connected Connect with the old walls from the Qin , Yan , and Zhao states .

The end of the conflict Hostile_encounter saw the restoration of the territory south of the Tian Shan to Qing control Control meaning that the Qing now controlled Control the whole of Xinjiang .