"In the spring of the fourth year of founding ceremony in the Yuan Dynasty, General Qing and General A title of generals in ancient times were each ordered to ride 50,000 sick soldiers, and hundreds of thousands of infantry turned to the army. Those who dared to fight hard all returned to a title of generals in ancient times." This historical record is official. Before the war, Emperor Wu of the Han Dynasty made careful arrangements: General Wei Qing led the former general Li Guang, the left general Gong Sunhe, the right general Zhao, the middle general Gong and the later general Cao Xiang, and commanded 50,000 cavalry to leave the county to find the Xiongnu for a decisive battle; A title of generals in ancient times general Huo Qubing led fifty thousand "Athens" on horseback out of Dingxiang, looking for Xiongnu Khan main decisive battle. But as soon as the team set out, they seized the Xiongnu riding whistle and learned that Khan's main force had moved eastward. Emperor Wu of the Han Dynasty temporarily changed the deployment, and changed Huo Qubing's eastward movement to Dai Jun, which was convenient for finding the main force of Khan. Wei Qing's main force changed from Dingxiang to attacking the left in the north. Wei Qing led former general Li Guang, left general GongSunHe, right general Zhao, and later general Cao Xiang out of the fortress. Knowing that Khan did not travel eastward, he led his own elite troops, and Li Guang and Zhao made a detour from East Road to coordinate. Wei Qing crossed the desert for more than 1000 miles, and fought against the already deployed Khan headquarters. Wei Qing first took Wugang vehicles (personnel carriers) as the camp, stabilized his position, and immediately sent 5000 riders to battle. By dusk, the wind suddenly blew, and Sha Wutong ordered Wei Qing to return, and the cavalry surrounded Khan from two wings. Seeing that the Han army is stronger than Mazhuang, it is difficult to win. He rode hundreds of soldiers and fled to the northwest, and the Xiongnu army broke back. Wei Qing sent Qingqi to chase after, followed by the main force. Up to Yanshan Mountain (a branch south of Hang 'ai Mountain in the People's Republic of Mongolia) and Zhao Xincheng, nearly 20,000 people were wiped out by the whole army, and their accumulated millet was burned back to the division. Li Guang and Zhao lost their way and failed to meet Wei Qing in Mobei. Huo Qubing led Li Gan, a captain, to join forces with Lu Bode, the magistrate of Youbeiping County (southwest of Ningcheng, Inner Mongolia), and crossed the desert to join forces with Xiongnu Zuo. The Han army fought a decisive battle, commanding the drums to seize the left. Xiongnu soldiers fled. Huo Qubing led his troops in hot pursuit and fought bloody battles in the Battle of Mobei until the wolf lived in Xushan (now east of Ulaanbaatar in Mongolia, northwest of Hexigten Banner in Inner Mongolia) and other places, reaching more than 2,000 miles, killing and injuring more than 70,000 people. The Battle of Mobei was a successful battle in the desert grassland area, with clear operational guidance and full preparation. With cavalry carrying out assault and infantry as the guarantee, it boldly advanced in depth and occupied an important position in the history of China war.