Song Yi's insight was not adopted, and the Empress Dowager Dou, who was eager to exonerate Dou Xian, strongly advocated the Northern Expedition, so the Northern Expedition was promoted.

Of course, the Northern Xiongnu, who were not as good as before, could not resist the strong blows of the Eastern Han government army, and Dou Xian himself did have a hand in the use of troops and had very good military talents.

In this way, the Northern Xiongnu categorically had no chance of victory.

After a bitter battle, Dou Xian successfully defeated the Northern Xiongnu and drove the Northern Xiongnu, who had declined to the point of being unable to fight against the Eastern Han Empire, out of the grassland and forced them to move westward.

From then on, the Northern Xiongnu no longer had the possibility of threatening the Eastern Han Empire.

They were completely defeated by the Eastern Han Empire, and left their homeland far away and headed west, causing unexpected and huge problems to the Western rulers of the same era.

But the troubles of the Eastern Han Empire did not end there.

What happened after that also proved that Song Yi's opinion was right.

Without the clamp of the Northern Xiongnu, the Eastern Han government army had no intention or plan to occupy the grassland, and the grassland became a development vacuum.

The Northern Xiongnu were completely beaten away, the Southern Xiongnu continued to stay on the northern border, and Dou Xian was soon killed by Emperor Han He on the charge of rebellion, and in the end it was the Xianbei people who got a big bargain.

Xianbei began to develop rapidly.

The population, the volume increased greatly, and soon it became an existence that the Han Empire could not be underestimated in any case.

Before the appearance of the sandalwood acacia, Xianbei was at war with the Eastern Han government, and it has become a major border trouble of the Eastern Han Empire.

It's a pity that Xianbei's luck was not good at that time.

Although the Han Empire is gone, the foundation is still there, the warlords at the end of the Han Dynasty have strong force, and they can still clamp down on Xianbei, and Tanshi Huai did not live long after all, making Xianbei miss the chaos in the Central Plains.

The second chance is to reunite the Xianbei Kirby Neng, but Kirby Neng also had no luck and was killed by the assassin Han Long.

These two times can be said to be God helping the Central Plains Empire.

Until the end of the Western Jin Dynasty, the Jin Dynasty was in turmoil, the national strength of the Central Plains Dynasty was exhausted in the internal strife, and the Xianbei people established seven countries in northern China one after another, and their homologous descendant Tuyuhun still existed until the Tang Dynasty, affecting the course of Chinese history for hundreds of years.

But the root of it is not how powerful the Xianbei people are, but the people in power of the Central Plains Dynasty themselves played themselves to death.

When they had the advantage, they did not make the right strategic decisions, but instead made a foolish move, and always began to despise the steppe tribes when they won the battle, completely unthinking that they had the possibility of a comeback.

So after reading the historical materials, Guo Peng expressed his views to Guo Jin who was standing beside him very helplessly.

"Before occupying the local control of the local area, we should not easily destroy the local political ecology, we need to know that the sandpiper and the clam compete with the fisherman to benefit, if there is no sandpiper and the clam, what profit does the fisherman gain?

Empress Dowager Dou and Dou Xian launched the Northern Expedition for their own selfish interests, and what they obtained was a tactical victory, a temporary victory and prestige, but the biggest victory was achieved by the Xianbei people.

The Xianbei people got almost everything left by the Northern Huns, the population increased greatly, and after 30 years, it eventually became a big disaster, and it was a disaster for the northern Xinjiang to this day, how is this not the fault of the Empress Dowager Dou and Dou Xian? ”

Guo Jin supported his father's opinion.

He believed that Dou Xian and Empress Dowager Dou decided to crusade against the Northern Xiongnu for political reasons, and used the crusade against the Northern Xiongnu as a political bargaining chip.

Their intention to go on the expedition was not for the whole country, but for their own family to continue to govern and hold power, which was not correct in the first place.

After winning a tactical victory, but not getting much benefit from it, and not making good use of the grassland to develop the grassland animal husbandry economy, it is equivalent to fighting a one-time war, gaining one-time fame, and then burying a mine for future generations.

Strategically, the war was clearly unsuccessful, at least they didn't look far enough.

The insights put forward by the contemporaries were also not adopted due to political factors.

This made several generations of emperors after the Eastern Han Empire very worried about the Xianbei problem, and wanted to fight Xianbei, but they were defeated by Xianbei.

During the reign of Emperor Ling of the Han Dynasty, the defeat of the Northern Expedition of 30,000 Eastern Han cavalry in Xianbei was something that Guo had personally experienced.

It was a battle that was hard not to lose, and even if it was barely won, it couldn't shake Xianbei's advantage.

So it also brought trouble to someone Guo later.

The current Xianbei, after more than ten years of uninterrupted attacks by Guo, has basically withdrawn from the Monan region, losing more than 200,000 people.

However, this did not really defeat the Xianbei people.

Guo just cleared the frontier for a while, so that the Xianbei people could not be seen in the border area, and there were many Xianbei people, all of whom were hiding in Mobei, and they still had the ability to reproduce and fight.

They were influenced by the activity of Wei's (Zhang) army (Fei) in the frontier and did not dare to go south on a large scale.

But this is only temporary.

However, more than ten years later, when the influence of the Xiaoice River can no longer be ignored, when the Xianbei people can not support themselves at all in Mobei, no matter how fearful they are, they will be forced to go south.

The southward shift of the zero isotherm will not only deal a devastating blow to the Han agricultural areas, but also to the Xianbei people in the pastoral areas.

A large number of people raised by them in warm times will not survive in cold times, and a large number of cattle and sheep will freeze to death, and the population will also be at risk of starvation.

In order to survive, in order to have a full stomach, even if there is a sea of swords and fires in front of them, they have to rush over.

If you don't rush, you will starve to death, and if you rush, there is still a glimmer of life.

How to choose one of the two, everyone has a scale in their hearts.

Therefore, Guo knows very well that if he does not take advantage of the current situation to completely solve the problem of the Xianbei people, in another ten years, the new generation of Xianbei will grow up, the population will increase, and hundreds of thousands of Xianbei cavalry will be forced to go south, which is when the Wei Empire is facing a big crisis.

At that time, he may still be alive, or he may still be the emperor, but Guo has never been a person who will choose to be beaten passively.

Guo's choice is always to move forward, move forward and move forward, war or war.

It is necessary to take advantage of the fact that his founding elite army still maintains strong combat effectiveness, when the founding generals still maintain a strong will to fight, and when the founding dynasty still maintains unparalleled mobilization power, simply and completely eliminate the Xianbei people.

For this reason, Guo decided to launch another decisive battle in Mobei.

The last decisive battle of Mobei was initiated by Emperor Wu of the Han Dynasty, in order to completely break the backbone of the Huns, Emperor Wu of the Han Dynasty fought the strength of the whole country and launched the decisive battle of Mobei against the Huns.

It's a pity that Emperor Wu of the Han Dynasty didn't have the three artifacts of cavalry, otherwise he could get more cavalry and a longer period of continuous combat ability, and the lethality of the Han army against the Huns would also be greatly increased.

The loss of horses will decrease, the combat effectiveness of the cavalry will increase, and the number of cavalry will increase.

And when the other party has not changed substantially, there is definitely the possibility of destroying the other party in one go.

This is Guo's biggest strategic goal.

The Huns were gone, and the biggest threat to the Wei Empire was the Xianbei people.

In his blueprint for war, he would mobilize between 150,000 and 200,000 cavalry, 200,000 to 300,000 transport mules and horses, and 70 to 1,000,000 auxiliaries and men.

With all the reserves accumulated in Hebei for more than ten years as the foundation, an unprecedented battle was carried out, sweeping Mobei and devouring Xianbei.

This time, Guo wanted to follow in the footsteps of the ancients, follow the steps of Wei Qing and Huo Quai, and uproot the replacement of the Huns, Xianbei.

So that there is no longer a single Xianbei person who dares to go south to loot on the grassland.

For this reason, he decided to launch a large-scale operation to sweep away corrupt officials at this time, and kill a group of internal rice worms before the war started.

In this way, the bureaucrats at the grassroots level should be deterred and let them run and act with all their might during the war, so that they will not drag their feet in the war and affect the battle situation on the front line, or they will embezzle military salaries, grain and other war materials when the war is tense and have an impact on the front line.

In the event of a big battle at the front, the rear must not catch fire, and if the rear catches fire, the results of the battle will be greatly reduced.

While Guo mobilized a large number of officials to go to various places to picket corrupt officials and corrupt officials, he was also preparing for a full-scale war in Luoyang.

He ordered the staff station to begin to aggregate all the news about Mobei Xianbei that the Wei people had obtained through wars, captives, and merchants in the previous ten years, and make a comprehensive judgment.

Not only that, but it is also necessary to make out the war sand table, mark the Xianbei people in Mobei, and determine the basic goal of the Wei army's Northern Expedition.

Over the years, although the Wei Empire has maintained a blow to the Xianbei tribe, the business exchanges with Xianbei have never been severed, and there should be business as well.

The special part of the Cao caravan and the Mi caravan undertook this part of the business.

These merchants brought all kinds of silk, cloth, salt, iron, and rice grains to the Xianbei tribe in exchange for a large amount of wealth.

For example, cattle, sheep and horses, or various leather products, bone products and other specialties.

On the one hand, it is necessary to meet the daily needs of Xianbei people, and on the other hand, it is also necessary to obtain these special products to do business in other places and continue to make money.

Anyway, if these rare goods are transported to Jiangnan, there will always be some profits.

And the trade demand in this area also left a buffer room for the Xianbei people, so that the Xianbei people did not have such a large-scale southward demand, and it would not make it difficult for Zhang Fei to deal with.

Zhang Fei then launched a war of thousands of people one after another through continuous fishing methods, and killed many Xianbei tribes who tentatively went south, accumulating a lot and making great achievements.

But with so many people, a small fight like Zhang Fei can't be completely eliminated.

Xianbei is a big collective, many people, and it won't work if you want to eliminate it in one go.

When dealing with an enemy of small size, it is not appropriate to engage in a strategic decisive battle directly with him.

And it is a good tactic to keep bleeding through a series of small-scale sneak attacks, so that it cannot grow smoothly and gradually wears out.

Zhang Fei's value is reflected here.