At the beginning of the Western Han Dynasty, Han Wangxin took refuge in the Xiongnu, and the Xiongnu Maodun Shan met Han Wangxin to attack the Han Dynasty together. Liu Bang, the ancestor of the Han Dynasty, personally led the army to Jinyang. After arriving in Jinyang, Gaozu did not rush into the army, but first sent spies to the Xiongnu camp to inquire about the situation. When the spy arrived at the Hun camp, he looked at it full of old and weak soldiers, thin cattle and horses, and seemed to be vulnerable. After returning to the camp, the spy reported to Liu Bang: The Huns must be easy to attack if the Huns are adjusted to zero.
Liu Bang didn't believe it, and sent more than a dozen spies in a row, and the situation was like this. Despite this, Liu Bang still couldn't rest assured, so he sent Liu Jing to visit again.
Liu Jing personally went to the Xiongnu barracks to check, but he didn't expect that the situation was the same as reported by the spy. But Liu Jing felt that something was wrong, and these superficial things seemed to be deliberately created as an illusion. Back in Hanying, Liu Jing solemnly told Liu Bang his thoughts. He said.
When the Han army arrived at Pingcheng, its heels had not yet been firm, and the Xiongnu ambush soldiers poured over like a tide. The Han army was surrounded by regiments, and after seven days and seven nights of bloody fighting, it successfully broke through. The losses were devastating. Liu Bang repented at this time.
Afterwards, Liu Bang named Liu Jing as the Marquis of Guannei, known as the Marquis of Jianxin.