The fall of Liaodong City meant that the Qi army had gained a firm foothold in Liaodong.

Duan Shao took a short rest, and originally wanted to leave Gao Xiaoyu to guard Liaodong City and receive the grain and grass in the rear.

But Gao Xiaoyu insisted on following Duan Shao to the east, and Duan Shao had to leave the marching commander Shi Cui Jishu in charge of logistics and supply, and the general Pi Jinghe presided over the city defense.

Immediately led the main force and sent troops to the banks of the Yalu River.

On the fourth day of the third month of the thirteenth year of Zhaode (560 AD), the two armies confronted each other across the Yalu River.

Hexi Qi battalion, there are 100,000 soldiers, 80,000 government soldiers, the rest of the people are either killed and wounded under the Liaodong city, or follow Cui Jishu, Pi Jinghe to guard the Liaodong city.

Goguryeo on the east side can be said to be a soldier of the whole country, with nearly 300,000 soldiers.

The reason why the Goguryeo people ventured out of the city to meet the attack and block the enemy on the west side of the Yalu River was more important than the timing of the Qi army's expedition.

At this time, it was spring ploughing, and if the Qi army was allowed to drive straight into Pyongyang and besiege Pyongyang, it would inevitably lead to a great famine.

Goguryeo, with the allusion of the death of the lips and the cold teeth, temporarily stabilized Silla and Baekje in the south.

The eastern and northern divisions left only a small number of soldiers to defend the city, and the main force was transferred to the banks of the Yalu River.

However, Goguryeo poured all the troops of the whole country to defend against the enemy, including not only the soldiers of the other four divisions, but also the army of the small group.

It turned out that the Xiqun clan followed Gao Cheng's arrangement, and took the initiative to reconcile with the Luqun clan on the grounds of 'brothers are on the wall and resist their insults from outside', and chose to resist the invading army of the Qi Dynasty.

After losing the battle for the throne that year, the Hosoqun clan has been developing its own armed forces in the local area, and its strength should not be underestimated.

The Lu Qun clan does not suspect that there is fraud, after all, the country has reached a critical point of life and death, and it is not impossible for each other to let go of their long-standing grievances.

After half a month of confrontation, Duan Shao sent envoys to cross the river and sent more than ten cows, sheep and a cart of wine to the Goguryeo army's main herd of deer.

This caused the deer herd to misjudge that the Qi army had enough food and grass, but in fact, the Liaoze land was hit by heavy rains, and the roads were reduced to swamps, making it difficult for people and animals to travel, and it was impossible to continue to transport supplies to Liaodong City from the rear.

It can only rely on the grain and grass hoarded in Liaodong City to supply the front line, and logistics have begun to be tight.

But it was Duan Shao's behavior that caused the misjudgment of the deer herd to turn the tide of the battle, and the deer herd saw that she couldn't drag down Duan Shao, so she could only take the initiative to fight.

After all, the stalemate between the two sides on the banks of the Yalu River not only put the logistics of the Qi army under tremendous pressure, but also the daily consumption of food by the 300,000 troops of Goguryeo was an astronomical amount.

At this time, the small group clan, as the internal response, instigated the adults of all departments to jointly propose to the deer herd to take the initiative to retreat five miles, give the Qi army space to cross the river, and wait for it to cross halfway to attack it.

This move is exactly what Lu Qun wants, he has an army of 300,000 under his command, and according to the number of scouts, the other party will not exceed 200,000.

In any case, the battle force of 300,000 against less than 200,000, the advantage is mine.

On March 22, the Goguryeo army took the initiative to retreat, and Duan Shao immediately made a decision and ordered the erection of a pontoon bridge over the Yalu River.

Lu Qun saw that Liaodong City was still supplying supplies to the front line, and Duan Shao even sent envoys to cross the river to the commander of the Goguryeo army, Mo Lizhi, the commander of the Goguryeo army, and took the initiative to retreat five miles to make enough space.

Duan Shao immediately made a decision and ordered the erection of a pontoon bridge.

The deer herd was overjoyed when they heard the news, their numerical superiority, and they would attack halfway through, how could they lose this battle.

However, things turned out unexpectedly.

Duan Shao had the information provided by the Xi Qun clan and knew the hydrology of the Yalu River, so he had made the pontoon parts early and only needed to assemble them on the river surface.

The deer herd thought that the Qi army would not be able to erect the pontoon bridge until the next day at the earliest.

In fact, on the night of the same day, the front of the Qi army, under the command of Hou Jing, Liu Feng and others, had already arrived at the east bank of the Yalu River and formed a formation on the back of the river.

When the deer herd learned that the pontoon bridge of the Qi army had been built, he did not care about panicking, and hurriedly gathered all the troops and marched five miles in a hurry, wanting to launch an attack immediately when the Qi army crossed the river with fewer troops.

But when the Goguryeo army came panting, most of the Qi army crossed the river and had already set up a battle to meet Goguryeo.

The deer herd did not dare to act rashly for a while, at this time the night was dark, and the Qi army had already taken precautions, and it could not give full play to the numerical advantage in the chaotic battle at night.

Just as the deer were about to retreat, a riot broke out in their camp, and a deafening noise came from the direction where the Hosoqun clan was.

"The Qi army is here! Run! ”

"Mo Lizhi (Goguryeo Prime Minister Lu Qun) was shot to death by the Qi people!"

"Our army is defeated!"

In the dim darkness of the night, the Goguryeo army could not distinguish the real from the fake, and no matter how loudly the deer shouted to prove that they were still alive, the sound was finally drowned out by the shouts of the small herds and the trampling of men and horses.

Gao Xiaoyu did not understand Goguryeo, but Duan Shao did not hide the battle plan from him, and when there was a riot in the Goguryeo army, even Gao Xiaoyu, who was on the battlefield for the first time, knew that this victory was won.

When the 100,000 soldiers who crossed the river first were ordered by Duan Shao, they quickly changed from a defensive formation to an offensive formation and slaughtered the Goguryeo army in chaos.

At this time, the command system of the Goguryeo army was already in disarray.

The battle of Weishui was still daytime, and just a group of Eastern Jin generals in the rear clamored for the defeat of the Qin army, which led to the rout of the former Qin army, not to mention that the night was dark now, and the Goguryeo people could not verify the truth at all.

When the small group was the first to flee, it also affected the rest of the departments, and they broke up one after another.

The battle expected by the deer herd did not take place, and a pursuit battle began on the east bank of the Yalu River.

100,000 Qi soldiers pursued the 300,000 Goguryeo army, which was like a frightened bird.

That night, the Goguryeo army trampled on each other and killed countless people, and in the direction of Pyongyang, corpses were everywhere.

After a day and a night of pursuit, more than 450 miles, Duan Shao did not stop until he crossed Sashui and was more than 30 miles away from Pyongyang.

The deer fled into the city of Pyongyang in a hurry, raising 300,000 troops to defend against the enemy, but less than 40,000 returned to the city, and many more did not know where they fled in the rout.

After this defeat, the people in Pyongyang were panicked.

Two days later, Duan Shao joined forces with the servant army and besieged Pyongyang.