Only 20 years old Huo went ill in the Hexi Corridor to create the glory of the Han Empire, after 2 major wars, the Han army firmly grasped the entire Hexi Corridor, the Xiongnu desert defense line door opened, the desert can no longer become an obstacle to the Han Army's Northern Expedition, in order to completely solve the Xiongnu problem in one battle, the Han Wudi Emperor Liu Che began to prepare for the next huge decisive battle after the end of the Hexi War.
After a year of rest, in the spring of the fourth year of the Yuan Dynasty (119 BC), Emperor Liu Che of the Han Dynasty sent the general Wei Qing and the hussar general Huo Quyi to lead 50,000 cavalry and tens of thousands of infantry into the north of the desert in two ways, striving to completely annihilate the main force of the Xiongnu, and organizing hundreds of thousands of infantry and tens of thousands of horses to support the battle. The scale of this battle was the largest military operation since the founding of the empire, and almost all the elite generals were all on the battlefield, the Huofuyi Army swept all the way from the Hexi base from The Fayuan to the east, the Weiqing Army set out from the Shuofang base from the south to the north and then to the west to attack, and the two main forces agreed to meet at the Xiongnu Yanshan (a branch south of the Hangai Mountain in present-day Outer Mongolia).
The news of the Han army's attack shocked the entire Xiongnu, Huo Toyi and Wei Qing were not fuel-saving lamps, especially Huo Deyi, and the Xiongnu had long been beaten out of "phobia". At this meeting, Huo went ill once again staged what is called a wild surge, Huo went to the sick army, attacked from the western front to avoid the barrier of the desert, along the way lightly armored and simple from relying on the captured supplementary supplies to feed the war, only to eliminate the Xiongnu's living forces, a total of 73,000 levels of the Xiongnu, not nostalgic for the attack on the city, the captured heavy supplies except for the needs of the supplementary legion, all burned without leaving a grain for the Xiongnu, completely destroyed the Xiongnu's economic base, under the Huo's "cut off children and grandchildren" playing method, the Xiongnu's western front soon collapsed. The Xiongnu in the west retreated to the east, and the Huns inadvertently formed a local advantage in the east. The Xiongnu Yizhi Shan Yu keenly captured this point, and Yi Zhi Shan Yu, taking advantage of the fact that the Weiqing Legion had just come out of the desert and was exhausted, concentrated more than 100,000 superior troops to carry out an all-out attack on the 50,000 people of the Weiqing Legion, trying to crush Wei Qing first, and then marching west to meet the Huofu Disease Legion.
More than 100,000 Xiongnu iron horses like locusts covering the sky to launch a mocking attack on the Weiqing army, such a scene made many Han generals really frightened, the Xiongnu are here to play for their lives, Wei Qing is worthy of the title of famous general, in the face of such a sinister start, Wei Qing from beginning to end unusually calm, he quickly ordered the soldiers to build the first line of defense with chariots and deer firewood, delayed the attack of the Xiongnu cavalry, and then ordered the crossbowmen to form a phalanx to shoot at the Xiongnu to avoid contact with the Xiongnu short soldiers. The Xiongnu army under the rain of crossbow blows of the Han army, still like crazy to attack the Han army camp, seeing that the defensive line is about to tear, Wei Qingqin led 10,000 elite cavalry to detour the Xiongnu flank, launched an attack on the Xiongnu, the two armies in the open grassland cut each other, from morning to night, and finally the Han army with excellent weapons and equipment and the correct command of the commander, won the final victory, this battle beheaded the Xiongnu 19,000 ranks, the main xiongnu army collapsed, Yi Zhishan only led more than 200 subordinates to escape, captured more than 70,000 Xiongnu, capturing more than 70,000 Xiongnu. Millions of cattle, sheep, and horses were captured, and the Xiongnu could no longer organize effective resistance in the desert north.
After the war, the Weiqing Army continued to pursue and annihilate the remnants of the enemy to sweep the desert north, and the large and small tribes of the Xiongnu surrendered to the Han army and became the vassals of the Han army, only the Xiongnu Zuogu Li King led the remaining 100,000 people to flee to the North Sea (Lake Baikal) to avoid the Han army. In the end, the Weiqing Legion and the Huo Zhiyi Legion successfully met at Zhao Xin City, and a solemn ceremony was held here to highlight the great victory of the Great Battle of Mobei, and the Han army washed away the shame of the founding emperor Han Gaozu Liu Bang in Baideng City with iron and blood.
When the bloody Han army led by Wei Qing and Huo Quyi returned triumphantly, Chang'an City boiled over, and hundreds of thousands of people spontaneously welcomed the great generals and soldiers on both sides of the road, which was the most exuberant day of the empire.