Therefore, even when dynasties such as the Qin and Han Dynasties were prosperous and powerful, they only defeated and conquered the nomads, then placed them in the border areas and let them herd and guard the borders.

However, for different races and cultures, this policy of submission and restraint can often truly control them. Once the central dynasty weakens or there is civil strife, the nomads in the border areas will often rebel.

Therefore, the northern boundary of the Central Plains dynasties was actually this rainfall line, and the Great Wall of all dynasties was basically on this line.

Although there are still prosperous Hetao areas along this line, they cannot be controlled as long as their strength is slightly weaker.

The two sides have completely different lifestyles, but it is difficult to live in peace. The nomadic peoples on the grassland have always been stronger, but relatively backward, and their ability to resist disasters is also weaker. Therefore, when severe droughts, heavy snowfalls and other major disasters occur in the grasslands, it is easy to

The weak preyed on the strong, triggering wars. In the end, these tribal wars often easily evolved into invasions and plunders of the Central Plains.

The Great Wall was built in the Sui Dynasty to isolate people from harassment by nomads.

Wuyuan City is an important fortress on the Great Wall. Su Lie and others do not care about salt or trade, they only care about fighting.

A group of generals gathered together and sent out a large number of light cavalry to conduct reconnaissance, studying how to capture Wuyuan City.

Wuyuan is sixty miles away from Wucheng and serves as the strategic point of Shuofang Great Wall.

Along the Great Wall, there were many ancient castles and beacon towers. They considered how to capture and recover them one by one.

However, Wu Huaiyu felt that they were worrying too much.

Judging from the fact that Liang Shidu gave up Wubaichi and Wubaicheng directly, they would not defend Wuyuan. Although this was the strategic point of the Great Wall, they obviously did not have the courage to confront the Tang army in Yanzhou.

There is a high probability that there will be no war in Wuyuan.

What Wu Huaiyu faced now was not actually a military confrontation. Master Liang was obviously intimidated and directly played with him to clear the country and move all the people away, leaving him an open space.

Wu Huaiyu regained Yanzhou and had to face the problem of no one.

This is a bad thing, but not entirely a bad thing.

The disadvantage is that it takes time to recover and there is a shortage of people. The advantage is that he is left with a blank piece of paper, allowing him to write and paint. He can redistribute the entire Yanzhou structure and interests more easily and conveniently.

A few days later.

Wu Huaiyu stood on the tower of Wuyuan City, the fortress of the Great Wall. Everything was as he expected. Division Liang did not want to fight with him at all, so he withdrew directly, withdrew his troops and relocated the people, strengthened the walls and cleared the fields, and directly withdrew from Yanzhou.

They retreated all the way to the north of the Xia Great Wall and the Hongliu River area.

Wu Huaiyu reported victory to the emperor of Chang'an and successfully regained Yanzhou without spending a single soldier, taking back four salt ponds and thirty-six forts in two counties.

Su Lie successfully joined forces with Duan Decao, the governor of Xiazhou.

Duan Decao led Liu Lancheng and Liu Min and led the Xiazhou Army to recover the lands north of Baiyu Mountain and south of the Great Wall. They also restored the land on the west bank of the Hongliu River and now control Ningshuo County within the Great Wall and the Hongliu River outside the Great Wall.

Changze County to the west.

The Liang divisions were all guarding Shuofang City on the lower reaches of the Hongliu River, and still controlled the Yinsui land east of the Hengshan Mountains.

But with the advance of Wu Huaiyu and Duan Decao's armies, the Baiyu Mountain and the first-line defense of the Great Wall that they originally controlled were completely torn apart.

Now he has the Yellow River to the east, the desert to the north, and the Great Wall controlled by the Tang Army to the southwest, and the Baiyushan defense line. He is completely trapped in a dead end, especially after losing the defense of the Yanxia Great Wall, he has been completely exposed to the Tang Army.

Taking the initiative to retreat, although he avoided fighting with the Tang army on the outside, it also made him unable to retreat and lost his strategic buffer space.

Datang easily achieved the strategic victory in the first stage and had a huge advantage.

Xue Wanche, the governor of Lingzhou, led his army northward and took control of Youzhou. This made Wu Huaiyu particularly safe now. There was Youzhou in the north, blocking Yu Sheshe from the Loop, and Duan Decao in the east, blocking Shuofang from Liangshi.

Du, with the Prince Consort Duan of Gyeongju behind him.

Wu Huaiyu's Yanzhou is now out of reach of the enemy.

An accompanying soldier from the Lingzhou Dudu's Mansion suggested to Huaiyu that the soldiers were idle and it was better to send them out to encircle and suppress the rebellious Qiang and Hu rebels.

This guy couldn't wait to catch slaves again.
Chapter completed!