Qin campaign against the Xiongnu

In 215 BC, the Qin army led by General Meng Tian defeated the Xiongnu, drove them from the Ordos, and seized their lands. After the catastrophic defeat at the hands of Meng Tian, the Xiongnu leader Touman fled far north into the Mongolian Plateau. ==Aftermath==

Following the victory, General Meng Tian was instructed to secure the frontier with a line of fortifications, which would become known as the Great Wall of China. He and Crown Prince Fusu were stationed at a garrison in Suide and undertook the construction of the walled defenses, which was connected with the old walls from the Qin, Yan, and Zhao states. As a result of the northward expansion and the resulting threat of the Qin empire, the many different Xiongnu tribes reorganized and united into a confederacy against the Chinese state. ==See also==