During the era of Emperor Wu of the Han Dynasty, the Han Empire entered its heyday, and more than 60 years of recuperation created a strong rise of the Han Empire. Previously, Emperor Liu Che of the Han Dynasty had already swept away the southern separatist regimes such as South Vietnam and Southwest Yi, and in the 30-year Han-Hungarian War, the Han Empire was also in the upper hand and achieved new ruling areas such as the Hexi Corridor and the Western Regions. Looking around the territory, the sun and moon illuminated the Han territory, and Liu Che, who was "alone and defeated", set his eyes on the distant North Korea (Wei Manchu Korea).
Because the main forces of the Han army were fighting the Xiongnu on the northern and western fronts, in the autumn of 109 BC, a force of 50,000 prisoners, led by the general Yang Shu of the Lou ship and the general Xun Yan of the left, attacked Wei Korea by land and sea. The left general Xun Yan (荀彘), a close vassal of Emperor Wu of The Han Dynasty, crossed the Yan Great Wall from Liaodong, crossed the Muddy Water, and attacked Wang Jiancheng (the capital of Wei Manchu). General Yang Shu of louchuan was a veteran of the battlefield, who had made many achievements in the conquest of South Vietnam, and Yang Shu set out from Qidi and led a navy of 7,000 people to cross the Bohai Sea and land at the mouth of the Datong River. Xun Yan and Yang Shu appeared so obscure in the shining military circles of the Han Empire, 2 obscure generals, tens of thousands of prisoners army, how to look like a march, and the most fatal thing is that Liu Che did not set up a commander in this military operation, which almost led to the failure of this operation, but also indirectly led to a series of tragedies later, but it can be seen that Liu Che really did not put Korea in his eyes (too bullying).
It was precisely because of this military campaign to conquer Korea that Liu Che did not set up a commander, and Xun Yan and Yang Shu divided their troops and advanced together on land and sea, resulting in many flaws in military coordination between the two sides, and what was even more serious was that Yang Shu, as a veteran general on the battlefield, wanted to monopolize the full merit of attacking Korea, so before Xun Yan's army arrived at the scheduled battlefield, he took the lead and took the lead in setting out, taking advantage of the convenience of his navy's actions to preemptively land on the Datong River and launch an attack on the Korean army. Yang Yu's surprise attack disrupted Xun Yan's deployment, at this time Xun Yan's troops had not yet been assembled, and Yang Yu took the lead in attacking, so that the North Koreans could concentrate their main forces on attacking Yang Yu's troops, and Yang Yu's troops were almost completely destroyed, and had to flee to the sea to wait for help.
In this situation, Xun Yan led the main force to accelerate the advance, and when the news of Xun Yan's entry into Korea reached Wang Jiancheng (weiman's capital of Korea), in order to avoid military attacks by the Han army, the king of Joseon took the initiative to find Yang Shu and agreed to surrender to the Han army. This is simply a pie in the sky that fell on Yang Shu's head, or took the initiative to send it to the door, Yang Shu has no reason not to catch it, and if he can surrender the King of Korea before Xun Yan arrives at Wang Qiancheng, not only can he offset the previous military defeat, but also can still monopolize the full merit of the "Campaign to Destroy The Dynasty". Yang Servant resolutely sent envoys to contact the King of Joseon, and the two sides quickly reached an armistice, the two armies temporarily stopped military operations, Yang Servant simply stationed the camp outside Wang Jiancheng City, and sent messengers to Chang'an to report victory, seeing that Yang Servant was going to surrender his troops without a fight and enjoy the great merits of destroying the country alone.
The news reached Xun Yan's army, which was marching towards Wang Jiancheng, and Xun Yan almost jumped up in anger, and he had worked hard to attack city by city, fight after battle, but he made a wedding dress for Yang Shu's boy, and the more he thought about it, the more angry he became. Therefore, taking advantage of the fact that the imperial court had not yet reached the threshold of accepting the order of the Korean surrender, he accelerated his march towards Wang Qiancheng in an attempt to preemptively capture Wang Qiancheng. Because of the armistice between the King of Joseon and Yang Shu, Xun Yan's march was more unimpeded, and soon arrived at Wang Qiancheng, after which Xun Yan launched an attack on Wang Jiancheng without any greeting, which completely angered the King of Joseon, and he resumed his stubborn resistance and no longer believed in the promise of the Han army.
The war was once again postponed indefinitely, because the city of Wang Qiancheng was strong and difficult for the Han army to capture for a time, in order to reduce casualties, Xun Yan had to change his tactics and replace the strong attack with siege. At the same time, it selected elite grain routes to attack the Korean army and completely blocked Wang Qiancheng's communication with the outside world.
In the summer of 108 BC, after more than half a year of siege, the King of Joseon finally could not eat it, opened the city gate to surrender to the Han army, the Han army officially settled in Wang Jiancheng, with the fall of Wang Qiancheng, the whole territory of Korea has laid down its weapons to surrender to the Han army, so that the Han army occupied the entire territory of Wei Korea in one fell swoop, and Wei Korea also declared an end. After the war, Emperor Liu Che of the Han Dynasty set up the four counties of Zhenfan, Lintun, Lelang, and Xuanju in the old wei dynasty of Korea, which were the four counties of Han. Pushing the northeastern frontier of the Han Empire to the center and north of the Korean Peninsula, east to the Sea of Japan, and south to the north of Seoul, the expansion of the Han Empire in the northeast reached its extreme.
By the way, the end of xun yan and Yang servant, after the war, Liu Che held Xun and Yang responsible. The left general Xun Yan (荀彘) was jealous of the competition for merit and made a mistake and beheaded and abandoned the city. The louchuan general Yang Shu did not wait for the combined army, and the lone army ventured forward, so that it was defeated, and many people were killed and wounded, and they atone for their death crimes to civilians. The two heroes who destroyed the country finally got such a fate, which is inevitable that people will not be lamented.