In the northeast of the Han Dynasty, Goguryeo, Baekje, and Silla formed a country of their own, with strong strength, with more than 100,000 troops, conquest against each other, and often invaded Liaodong of the Han Dynasty. Among them, Goguryeo was the strongest, and Baekje and Silla were oppressed by it for a long time, but since Gongsun Du became the Taishou of Liaodong, he united Baekje, Silla, and Yufu to fight against Goguryeo, and Goguryeo was somewhat restrained and did not dare to easily invade the surrounding countries.

Not long ago, after the death of Gongsun Du, the king of Goguryeo, believing that the time was ripe, invited the kings of Baekje, Silla, and Fuyu to come to the meeting to discuss the affairs of the northeast. The kings of the Three Kingdoms also heard the news of the death of Gongsun Du of Liaodong and the chaos in Liaodong, and after losing strong reinforcements, the Three Kingdoms were afraid of Goguryeo's retaliation, so they could only send their subordinates to participate in the alliance.

The king of Goguryeo received the envoys of Baekje, Silla, and Fuyu in Pyongyang, and proposed that the four countries form an alliance to rebuild the empire and jointly fight against the Han Dynasty. Baekje and Goguryeo originally belonged to the Buyu Empire, but with the decline of the Buyu Empire, the two countries became independent and belonged to the same lineage, and they did not object to the alliance, and also hoped to restore the glory of the empire.

As the big brother of Goguryeo and Baekje, Fuyu did not want to obey Goguryeo, although his strength declined. Silla was a small country established after the division of the Yufu Empire, and although it belonged to East Asia, it was not of the same ethnic group as the other three countries, and it was a regime established by the Mahan people, so it was natural that they did not want to follow the advice of the Goguryeo people.

Goguryeo saw that Fuyu and Silla were unwilling to form an alliance, and they were not in a hurry, so they first said to the Silla envoy: "Please also ask the envoy to go back and tell the king of your country that the great general of the Han Dynasty, Yuan Xi, has exterminated the power of the island country, and the next target is likely to be Silla, don't think that with us blocking Liaodong for you, Silla can rest easy!" ”

The Silla envoy was silent, and what the King of Goguryeo said was exactly what the Silla people were most worried about, and they were always inquiring about the news of the Yuan army on the island country in order to prepare early. Although the envoy of Silla obeyed the king's orders and did not participate in the alliance before coming to the alliance, he did not want to block the road, so he thought for a while and replied respectfully: "The king is right, and I will tell my lord when I go back and make a decision." ”

When the Goguryeo king saw that the Silla envoy had changed his attitude, it seemed that he had succeeded in stirring up the concerns of the Silla people, and that he would soon choose to form an alliance. The king of Goguryeo then looked at the envoy of Fuyu, who had been ordered by the king not to provoke Yuan Xi before he came. The envoy of Fuyu resolutely said: "Forgive me, the king, my lord has a word first, if the alliance invades the Han Dynasty, my Fuyu will resolutely refuse." ”

Before the king of Goguryeo asked, the envoy of Fuyu had already said to death, and said angrily: "Could it be that your Fuyu has already taken refuge in Yuan Xi, you are asking for your own death." The envoy of Fuyu was a tough person, and he did not want to change his position because of Goguryeo's slander, so he retorted: "Although my Fuyu does not want to offend the Han Dynasty, please rest assured that the king will not defect to the Han Dynasty and go against everyone!" ”

After the envoys of the three kingdoms returned to their own countries, they reported the alliance, and Goguryeo wanted to form an alliance to attack Liaodong together. Baekje and Silla decided to form an alliance with Goguryeo, but Fuyu decided to ignore it, believing that challenging the Han Dynasty was tantamount to death, and although the Han Dynasty was in decline, there were still millions of elite soldiers.

After the first alliance between Goguryeo, Baekje, and Silla, Baekje responded to Goguryeo's proposal to hold a three-nation alliance in Seoul to form the Samhan Alliance, and the king of Goguryeo assumed the leadership of the Samhan Alliance. A month after the death of Sun Du, the Taishou Gongsun of Liaodong, Sanhan raised more than 100,000 troops and began to invade Liaodong, killing the local people.

Yuan Xi received a distress signal from Liaodong, and summoned his subordinates to begin to discuss countermeasures. Sending troops is everyone's common idea, and how to use troops is up to Yuan Xi to decide.

Xu Shu, the military advisor, believes that Liaodong should be rescued, although Liaodong has been disrespectful for a long time, but after all, it is the territory of the Han Dynasty and cannot be violated. The general Changshi Jiaxu believed that when they were both defeated, sending troops again would not only take Liaodong, but also inflict heavy losses on Sanhan. The marching Sima Pangtong believed that Zhang Jaw and Sima Yi, who were stationed in the island country, could lead the troops to attack Silla, and let Zhang Liao lead the troops to rescue Liaodong, so that the three Koreas could not take care of each other.

After some detailed discussion, Yuan Xi decided to personally lead 100,000 troops to support Liaodong and pacify Sanhan, and ordered Zhang Liao to be on standby at any time to prepare to attack Liaodong, while Zhang Jaw received Yuan Xi's order to attack Silla with all his might. Although Yuan Xi transferred 100,000 horses from Jizhou, he only ordered Gao Shun, Zhao Yun and Pang De to go on the expedition, leaving most of the Hebei generals to guard Jizhou, so as not to rob Cao Cao while the fire was fired.

When Gongsun Du heard that Yuan Xi had sent 100,000 troops from Jizhou, he scolded Yuan Xi for being insidious. This is hoping that he and Samhan will lose both! The Youzhou army is strong and can fully support Liaodong, but now there is suffering, if you don't resist with all your strength, you will lose Liaodong, and you will no longer have a bargaining chip with Yuan Xi.

The Samhan coalition army was dominated by Goguryeo, and the Goguryeo king was naturally the supreme commander, and the 20,000 troops of Baekje and Silla were also under his orders. The king of Goguryeo led his army to fight with the Liaodong army for several days, and the commander of Liaodong, Gongsun Kang, did not have the ability to lead the troops of Gongsun Du, although he had tens of thousands of iron cavalry, but he was suppressed by the pikemen and bows and arrows of the three Hans, and was defeated and retreated, and finally had to retreat to Liaodong City.

The king of Goguryeo ordered the Baekje army to attack the south gate, the Silla army to attack the north gate, and the east gate himself, but failed to capture the city for several days. As a result, the king of Goguryeo ordered the people of Liaodong to act as the vanguard to cover the attack of his army. Although Gongsun Kang was not able to lead the troops, he could not ignore the lives of so many Liaodong people, and did not dare to attack casually.

Just when Gongsun Kang lamented the fall of Liaodong City and was about to lead the army to retreat to Youzhou, Zhang Liao led the army to arrive, and the three Han coalition forces had no choice but to withdraw from Liaodong City. When Zhang Liao saw so many people sacrificed outside the city, he immediately hated Sanhan to the core, and immediately sent someone to inform Yuan Xi and ask to go on the expedition. Since the incident of Zhao Yun and Zhang Jaw, the Hebei generals have a new understanding of the general, and without the general's military order, they will never dare to fight at will.

Yuan Xi was also amazed at the viciousness of the Sanhan people, who actually used the people as a cover to attack the city, which was a military taboo, even if he could win a temporary victory, he would not rule for a long time. Yuan Xi ordered Zhang Liao to take over Liaodong City, and then attack the Samhan army with all his might. Gongsun Kang's ability to lead the troops was so poor that he actually let the Sanhan people hit the door in less than a month, and he also accelerated the speed of the march.

Although Gongsun Kang did not want to hand over the military power of Liaodong to Zhang Liao, but without Zhang Liao's command, he was afraid that his Liaodong cavalry was not the opponent of Sanhan, and Yuan Xi's army was about to arrive.

Zhang Liao obtained the military power of Liaodong, and the Liaodong Iron Cavalry was a powerful army, with excellent horses and tall soldiers, even Gongsun Du could defeat Goguryeo several times, how could it be so wimpy in the hands of Gongsun Kang? Zhang Liao's Youzhou soldiers are also mainly cavalry, and the Liaodong Army also has 80,000 people, although the pikemen phalanx of Sanhan can restrain the cavalry charge, it is a military idiot like Gongsun Kang who will think that his cavalry is invincible in the world and directly charge. Zhang Liao was different, using the mobility of the cavalry to bypass the phalanx of Sanhan and directly attack the grain route behind Sanhan.

The king of Goguryeo saw that Zhang Liao did not fight head-on with him, but chose a roundabout tactic, bypassing his main force and attacking his weak points. The three-Korean coalition army was dominated by pikemen and archers, and the speed of movement was certainly not as fast as Zhang Liao's cavalry, and while ordering the rear to strengthen its defenses, it was dealing with Zhang Liao's sudden attack and slowly retreating.

Sun Li and Tian Yu served Zhang Liao's generals, each leading 5,000 cavalry and penetrating deep behind enemy lines. Although the three Korean coalition forces reacted and urgently ordered the rear to strengthen their vigilance, it was too late, Sun Li and Tian Yu burned the grain and grass of the three Korean coalition forces, and then occupied a dangerous place, preparing to flank the three Korean coalition forces in front and rear.

When the king of Goguryeo heard that the Han army had burned his own grain and grass, he was immediately worried, so he could only withdraw to Pyongyang City before negotiating. Zhang Liao would not let him leave easily, constantly harassing and slowing down the retreat of the coalition forces. Goguryeo had a vast territory, marching so slowly, sooner or later starved to death on the way back to Pyongyang, so it chose the nearby border city of Marudu Mountain City, and first escaped the pursuit of the Han army with the city.

Since Sun Li and Tian Yu burned the grain and grass of the coalition army, they guessed that the enemy army would not dare to travel far and would definitely choose a nearby city to supply grain and grass. Sure enough, the Sanhan coalition army threw itself into the net, and the king of Goguryeo only ordered someone to monitor Zhangjaw's cavalry, but he didn't expect that there were ambushes in his rear, and they were suddenly attacked by Sun Li and Tian Yu, and the rear was in chaos. When he switched his formation and wanted to repel Sun Li and Tian Yu's soldiers and horses, Zhang Liao seized the opportunity and launched an attack, but the Goguryeo king could not resist it, but fortunately, the Goguryeo guards of Marudu Mountain Fortress opened the city gate in time and let the three Han coalition troops enter the city, so as to escape the fate of the annihilation of the whole army.