For Yan Guo, Murong Ke's death was tantamount to the fall of Optimus Prime. His death put the entire Yan Kingdom in chaos, especially the confrontation with the Tang Army on the border, which became extremely tense. Because everyone understands that Datang is eyeing Yan Guo, and has always wanted to swallow Yan Guo, but because he is afraid of Murong Ke's existence, he has no chance.

Murong Ke has a very high prestige in the Yan Kingdom, and his existence has reunited the Yan Kingdom that was about to collapse, although it cannot be said that it is united, at least it was not dispersed immediately. Originally, his existence was to make Yang Lu and the others, especially those of the Murong clan, still have a glimmer of hope, feeling that there is still a chance to make a comeback.

But who would have thought that only a few years had passed, and he would actually die. If Murong Ke's actions are in line with everyone's expectations, then Murong Ke, who took over, is really far behind.

Murong commented that this person couldn't listen to others, and he was unwilling to let go of power. Although he heard the news of the spies' report and knew that Liu Xiaohai and other generals of the Tang Army had rushed back to Chang'an, he was quite worried for a while.

After learning the news that the Tang army might come to attack Yan, he immediately ordered the front line and the border of the Tang Dynasty to be strengthened. Even he himself rushed to Jinan County, preparing to resist the Tang army's crossing to the south.

But who would have thought that at the end of May, the news was reported that the Tang Army had moved, but then nothing happened. The whole thing looked like a false alarm, as if Datang's side was just bluffing.

At the beginning, Murong Ping also thought that this was Li Xin's strategy, and he wanted to relax himself before attacking him. Therefore, for three consecutive months from May to July, he was not guarding carefully.

But after July, his vigilance began to slowly relax, because the Tang army on the north bank did not attack at all. After that, as time passed, his vigilance became less and less.

Although it is said that Yang Lu, Huangfu Zhen and other officials are persuading him, saying that he must beware of Li Xin. But Murong Ping didn't listen to it at all, he bluntly thought that this time everyone guessed wrong, and Li Xin would not come to attack Yan Guo at all.

No one else can do it! After all, it is Murong Ping who is in charge now. And once the upper echelons began to relax, let alone those below, by the time November and December, the troops on the border of Yan Kingdom had become less concerned and felt that the Tang army would not fight.

It was under such circumstances that in December, something big and small happened in Yan Kingdom, Yang Lu died! Huangfu Zhen took over as his lieutenant, and Murong Zang, the king of Le'an, was appointed as the secretary. Within two years, Yan Guo lost several important ministers one after another, which was a big blow to Yan Guo.

Yan Guo, who was already disheartened by some people, felt more and more at this time that the ship of Yan Guo seemed to be coming to an end. Maybe it will sink sometimes, and if you stay on this ship, you may have to be buried with it at some point.

But in any case, in this year's time, until March of the ninth year of Tianding, the whole world was still very peaceful. For more than a year, Datang did not launch an attack on Yan as expected, which surprised many people.

On the contrary, Murong Ping, who had always advocated not to take it to heart, gained some prestige because of this, because some people suddenly felt that he also seemed to be a little prescient. Even Jiang Zuohuan and Wen were a little unsure of Li Xin's thoughts at this time, at least, their worries about Yan Guo had been reduced a lot.

Under such circumstances, on the last day of March, Li Xin quietly rushed to Pingyuan County, Pingyuan County. This place is located on the north bank of the Yellow River, opposite which is Jinan County of Yan Kingdom.

Not many people knew about his arrival at this time. In the entire Tang Army, only a small number of generals knew about it.

"How's the situation on Yan Guo's side?" Not long after arriving in the city, Li Xin asked Tu Qi, who had arrived a few days earlier.

"Everything is as His Highness expected, and now the whole Yan Kingdom has basically relaxed their vigilance. We didn't attack the Yan Kingdom when Murong Ke had just passed away, but we would choose to strike after a year, I'm afraid it was beyond their expectations! ”

"Very well, in that case, let's go according to the plan!" Li Xin nodded, and then commanded.

"Yes, the minister will arrange it immediately!" Tu Qi answered, and then hurried away.

A few days later, the Tang army in Youji and Shuo and other places began to move, and at the beginning, their actions were still very secretive, and no one noticed it. But the mobilization of the army is not a trivial matter after all, where can it be done silently.

So, soon the news that the Tang army went south to cut down Yan came out.

On the 10th day of the first month of April, the Tang army on both sides of the Yellow River, under the command of Liu Xiaohai, Shao Zisong, Chen Kang and other generals, officially launched an attack on the Yan army in Qingzhou from the north, west, and south.

The total number of troops and horses of the three sides was more than 150,000 men, and since the plan had already been drawn up, once the action was taken, they were all gathered together, and the attack was launched on the same day.

As for Zhao Ji, Lu Guang and others, they stayed in Xingyang, Chen Liu, Gao Ping and did not move. Their main energy was to guard against the Jin army in the south, and to prevent that when they fought with the Yan State of Qingzhou, the Jin army would come out to support the Yan State and make them suffer from the enemy.

Along with the banks of the Yellow River, there were also Liao Chuan in Youzhou, Li Erhei in Shuozhou, and Yu Song in Daizhou. But their offensive direction was different, and the troops were divided into two ways.

Among them, Li Erhei and Yu Song led the soldiers and horses of Shuo and Dai Erzhou, a total of 50,000 people, of which cavalry was the mainstay. After they left Yinshan, they replenished supplies, grain and grass in Daizhou, and then went all the way from Saiwai to the east, towards the area of Daxinganling.

That place was the route taken by the Yan army when it made a detour from Pingzhou to attack Shanggu. If you pass through here, you can bypass the dangerous barrier of Yanshan, and thus enter the territory of Pingzhou.

As for Liao Chuan, although he was at the foot of Yanshan Mountain, the 30,000 army he led did not directly go out of Songting Pass, Taolinkou Pass and other places to surpass the Yanshan Mountain Range. Instead, he used warships to cross the sea and march eastward from Tangshan in later generations, which happened to be located on the coast at this time, thus bypassing the danger of Yanshan and killing the Yan army in Pingzhou.

When he asked for war before, the thing that Li Xin gave him to do was to train the navy for later use. Due to the proximity of the border of the Tang Dynasty to the sea at this time, the Yellow River Navy trained in the Shuofang area before was transferred to the boundary of Youzhou as early as possible.

Not only is it densely forested and full of trees, but it is also very close to the sea, which can be of great help to Li Xin's swallow felling event.