Ordos Plateau
In Chinese accounts, the Xiongnu first appear at Ordos in the "Yizhoushu" and "Shanhaijing" during the Warring States period before it was occupied by Qin and Zhao. It is generally thought to be their homeland, however when exactly they came to occupy the region is unclear, and it might have been much earlier than traditionally thought, as suggested by archaeological finds. As the Xiongnu expanded southward into Yuezhi territory around 160 BC under their leader Modun, the Yuezhi in turn defeated the Sakas (Scythians) and pushed them away at the Issyk Kul. It is thought the Xiongnu also occupied the Ordos area during the same period, when they came in direct contact with the Chinese. From there, the Xiongnu conducted numerous devastating raids into Chinese territory (167, 158, 142, 129 BC). The Han Dynasty started to fight the Xiongnu in the 2nd century BC under emperor Han Wudi, and colonized the area of the Ordos under Shuofang commandery in 127 BC. Prior to the campaign, there were already commanderies established earlier by Qin and Zhao until they were overrun by the Xiongnu in 209 BC.
Ancient history
The Huns left practically no written records. There is no record of what happened between the time they left Mongolian Plateau and arrived in Europe 150 years later. The last mention of the northern Xiongnu was their defeat by the Chinese in 151 at the lake of Barkol, after which they fled to the western steppe at Kangju (centered on the city of Turkistan in Kazakhstan). Chinese records between the 3rd and 4th centuries suggest that a small tribe called Yueban, remnants of Northern Xiongnu, was distributed about the steppe of Kazakhstan.