When the Tang army marched north, Shi Yiqian and Murong Wen and others were fleeing for their lives together. They could never have imagined that this time the war with the Tang Army would be a complete fiasco in less than half a month.

At this time, whether it was Shi Yiqian or Murong Wen, all they were thinking about was how to save their lives. As for whether there is another chance to succeed in counterattacking the Tang Army, it is not something I have to consider.

Since encountering the Tang Army's obstruction at Shenhepi, and then being caught up by the Tang Army, the whole situation has completely collapsed. Shi Yiqian still doesn't understand why he lost so quickly.

Now, there are only hundreds of cavalry soldiers and generals and ministers left around him, and many others have already been separated. Murong Wen on the side was in a similar situation, even worse than himself.

They didn't dare to stop at any time along the way, and they ran all the way since they fled north. In the end, after passing the county and then crossing the old Great Wall, I was a little relieved.

"General Murong, this time I went south and came back, presumably the Tang army will not let you and me go! At this point, it's better to act separately! In addition, if you return to Yedu, please tell the king of Taiyuan, and our alliance will be over! After a short break, Shi Yiqian said to Murong Wen with an ugly face.

In Shi Yiqian's thoughts, a large part of the reason why he was defeated this time was because Yan Guo did not send troops to attack Shangdang and other places according to the regulations. As a result, Li Xin could put most of his troops on his side, otherwise why would he be defeated.

Of course, Murong Wen's 30,000 army was not counted among them, mainly because such a small number of people were simply not enough to see.

Murong Wen was still in a panic, where did he have time to think so much at this time, and after a few words, he immediately went separately.

"It shouldn't be, and the last thing it shouldn't be is to form an alliance with Yan State. If it is an alliance, it is just that, we should have let it send troops first, and after diverting the attention of the Tang army, we should send troops again! Looking at Murong Wen's panicked figure, Shi Yiqian was very remorseful.

If he had known that Li Xin was so powerful and Tang Jun was so capable of fighting, he would not have thought about it at all. It's a pity that there is no regret medicine in this world, and it's too late to talk about it at this time.

"What should we do now, King? If nothing else, Shengle City is estimated to be unable to go back! Also, on their side, I'm afraid it's already a failure! Liu Kuren followed by his side and couldn't help but ask at this time.

Hearing this, Shi Yiqian couldn't help but be silent.

"Let's go back to Saibei first! For the time being, we are powerless to compete with the Tang Army, so we can only stay in our hometown in Saibei honestly. But as long as we are given enough time, Daiguo will definitely be able to grow again. When the time comes, let's settle this new and old hatred with Li Xin! In the end, Shi Yiqian said hatefully.

After deciding on the decision, the group immediately turned around and rushed westward, preparing to rush back to the old land of Daiguo north of Yinshan first.

However, after traveling for about a day, the group happened to encounter a Daikoku ranger from the west. Moreover, these rangers are exactly the ones who came out to find Shiyigan.

"King Qiqi, Gaoche, Rouran and other clans, taking advantage of our great battle with the Tang army, suddenly rebelled and attacked and plundered our western tribes. The clansmen were forced to move eastward one after another, and asked the king to return to China as soon as possible to preside over political affairs! ”

"The hateful high car, the hateful Rouran, is it really easy to bully this king? Although this king was defeated by the Tang army, it is not something that they can bully like a miscellaneous slave! By the way, Tuoba Gu and Shizi, have they ever returned to Saibei? Hearing the news, Shi Yiqian couldn't help but be furious.

"The Lord of the North and the Prince of the World just returned to Saibei two days ago, but they were also defeated in Wuyuan, and they were spared by the annihilation of the whole army. Now they are gathering their people and preparing to attack the Gaoche and Rouran clans! The Ranger replied.

"That's it, the matter has come to this, everything else is put aside for the time being, and the civil strife is settled first! Everyone rushed back to their tribes at once, and the rebellion must be put down as soon as possible! When Shi Yiqian heard the news, he was somewhat relieved and hurriedly ordered.

At this point, as Shi Yiqian's energy turned to the grassland desert in northern Saibei, all places south of Yinshan Mountain were promoted and swept by the Tang army, and soon completely fell into the hands of the Tang Dynasty. The two counties of Yunzhong and Dingxiang, after being lost from the Central Plains Dynasty for a hundred years, finally came back at this time.

After Li Xin and Deng Qiang converged, they led the Flying Dragon Cavalry and the Bupo Army all the way east, but this time the speed was not very fast. While the army was moving forward normally, news continued to spread from all over the front.

First of all, the good news is that the generals of the various departments have advanced to the northernmost part of Dingxiang, Daijun and other counties according to Li Xin's order, and reached the place where the Great Wall of the Han Dynasty is located.

For the time being, they will not cross over again, but will be stationed in dangerous places to prevent possible attacks by the Saibei Hu people.

Whether it was the Qin Dynasty, which dominated the world, or the Han Dynasty, which later defeated the Xiongnu, the achievements of the predecessors were synthesized in the northland, and finally two Great Walls were built. One of them was built along the Yinshan Mountain Range, and this one is considered the Inner Great Wall.

The Outer Great Wall is nearly 100 miles north of Yinshan Mountain, and its walk is roughly no different from the Inner Great Wall. But its starting point is from the Inner Great Wall, and the location is in the area north of Zhangjiakou.

The Inner Great Wall can also be said to be called the Old Great Wall, because it was built during the Qin Dynasty. Its starting point is from Liaodong all the way along Yanshan and Yinshan to the west, and then turns south along the Yellow River dozens of miles west of the Yellow River in the Hetao area, and finally receives the area of Longxi County.

This Great Wall was built by Qin Shi Huang after the unification of the Great Wall that connected the original countries of the world.

The reason why he followed the Yellow River to the south in the Hetao area was because at the time of Qin Shi Huang, the land of the Western Regions was not owned by the Central Plains Dynasty and was not in the territory of great unification.

But after Emperor Wu of the Han Dynasty defeated the Xiongnu and captured the Hexi Corridor, he began to build another Great Wall outside for defensive purposes.

This Great Wall can also be called the New Great Wall, which branches off from the old Great Wall north of Zhangjiakou and then goes all the way west.

Unlike the old Great Wall, this road has been moving westward for thousands of miles in the grassland desert outside the Saiwai, until it reached Juyanze, and then turned south along the weak water. Then it continued westward dozens of miles north of Jiuquan, and finally received the area of Dunhuang Yumen Pass.

At this point, the Central Plains Dynasty's defense system against Saiwai was officially completed. No matter how many huge defensive projects later dynasties had, a large part of their foundation was built on the Great Wall of the Qin and Han dynasties.

And now, the Yinshan line has been completely occupied by the Tang Army, although it is far from reaching the limit of the boundary of the Western Han Dynasty, but it has begun to slowly approach. Li Xin did not think about rebuilding the Great Wall in the past, but it was still necessary to repair the necessary places.

Therefore, when he led his army to Heru County and came to the area of the old Great Wall, he ordered Tu Qi to send people to map out the terrain in this area. Then, he ordered Liang Cheng and other generals to move north from the place where they were previously stationed to the border.

In this way, while the current country is unable to counterattack, and a new overlord has not yet formed on the grassland, he can first restore this first line of defense system. Then, the north side can basically be at peace.

At that time, most of his energy can be transferred to the vast territory of the east.

"The first one is to immediately restore the two counties of Yunzhong and Dingxiang, choose a suitable place, and restore part of the county seat first! There is another one, that is, if the status of the county is important, this war has already told us the lesson. Therefore, the county must be restored immediately, and this place must be made one of the garrison points, and it will be responsible for the defense of the northland! ”

"While the troops will rest on the spot, they should keep a close eye on the Hu tribe in the north to prevent them from attacking and harassing them from the south. In addition, build beacons in dangerous places to restore the key passes of the Great Wall so that they can effectively defend against the enemy! After the staff department finished drawing the map, the Ministry of Industry sent people to repair the city and the city section by section! Li Xin convened all the generals to discuss the meeting on the site of the county.

This place in Ruxian County is the main road in and out of the Northland, and the old Great Wall is to the north of it. Because this place is located at the junction of the Yinshan Mountain Range and the Yanshan Mountain Range, the terrain is relatively less complex and steep.

From here, you can go to Dingxiangyunzhong, Wuyuan, Shuofang and other counties to the west, to the east you can go to Daijun Shanggu and other places, and to the south you can go to Yanmen Pass to enter Taiyuan Shangdang. In short, such a crossroads-like place must be in your hands.

According to Li Xin's plan, after recovering all the border counties in the north, several important military centers were to be set up here. For example, Zhangjiakou, such as Yunzhong County, Wuyuan County, etc., of course, and such a county is an indispensable part.

Only in this way will this defense system against the north finally take shape and give full play to its greatest effect.

And with the expansion of the border, it means that places such as Shanwu County, where the original garrison was originally garrisoned, will become the interior. While the security has been greatly improved, it has also been able to ensure the supply of local garrisons.

The deliberations lasted only a short time, and after Li Xin explained the matter, he continued to lead the army to the southeast, in the direction of Zhangjiakou in the future. This is the first time in less than a year that Li Xin has once again arrived in Shanggu County.

The battle on the side of the military capital was as unhot as before, and the expected Yan army attacked on a large scale, but it did not happen at this time. On the whole, the Yan army adopted an active defensive strategy.

That is to say, from time to time they will launch some attacks on Jundu Pass, Wuruan Pass and Changshan Pass, but they all have certain limits. Basically, it's the kind of war that ends at the point.