At the end of September 267. After the country basically completed the autumn harvest of this year, Sima Guan Yi of the Shu Han Dynasty led his troops to the Northern Expedition in a very low-key manner.

It's really very low-key, and there is no teacher watch, and there is no prayer for slaughtering cattle and animals. The armies from all walks of life quietly concentrated in Hanzhong and Wudu counties. After the people and property were ready, they sent troops in a very low-key manner.

He didn't mention the specific time of sending troops in front of Liu Chan at all, and Liu Chan was very smart and didn't ask. Then he sent a simple envoy to Soochow, saying in the Soochow court that his country was ready to send troops after the end of spring ploughing next year. That's fooling all your allies.

"Humph! The Jin State's march Cao is really not simple, if it weren't for the various secrets of this Northern Expedition, our side would have been on guard, and we wouldn't have known that the enemy had infiltrated the Great Sima Mansion. ”

"Hehehe, Lingxing. It's not just right, digging up a guy who has been lurking for such a long time. ”

"Hey, hey, speaking of which, my brother is also a thief. actually deliberately deceived Dongwu and used the news from Dongwu to mislead the Jin Kingdom. ”

"Hmph, although it is said that after Sun Yuanzong ascended the throne on the Dongwu side, it does have the meaning of cheering up and refreshing. But his time in power was too short after all. Therefore, the current Soochow is full of loopholes in the intelligence network. As a brother, he deliberately asked Dongwu to mislead the Jin Kingdom. In this way, we have at least two to three months. ”

"Hey, brother. There are at least five months left for next year's spring ploughing, right? ”

"Stupid! The Jin Kingdom may have been prepared for the start of the war in March and April next year. But as long as we make a comeback, the fool will know that he has been deceived. Won't people change their plans on the fly? ”

"Oh, yes. But brother, in this way, Soochow ......"

"Well, with the urine of those Wu dogs, it would be good to be able to move after the autumn harvest next year. I hope that after Sun Hao, those turtles can be faster. But it doesn't matter, Brother Wei didn't expect those Wu dogs to play much of a role. ”

"Hehehe, my little brother agrees with this. So brother, where do we go after we get out of the slope and enter Guanzhong? ”

"Well. If there is no obstacle at the north exit of Bao Chuan Road, we will go to Yixian first after entering Guanzhong. ”

……

The so-called Baoshui Road is the combined name of the Baoshui and the slope valley, a tributary of the Han River. Guan Yi's march route was to start from Lecheng in Hanzhong and go upriver along the valley of Baoshui. After that, enter the sloping valley between Baoshui and Wugong Water and continue walking. And the exit of the valley to the north is Gojogahara.

This road, among the six passages of traffic between the Guanzhong Plain and the interior of Yizhou, is the most convenient road. In addition, at least before this year, due to the business of high-grade liquor, Sima Wang turned a blind eye to the Shu Han government's re-reinforcement of the plank road of the Baochuan Road. Therefore, the road conditions of the slope are the best. After abandoning his plan to raid Chang'an through the Meridian Valley, Guan Yi marched to Guanzhong and chose this path as a matter of course.

Of course, since this road is the most suitable for marching troops, then the enemy will certainly see this as well. Therefore, in Guan Yi's plan, at the exit of the sloping valley, there should be an enemy garrison, and it is estimated that there will be a fight. And Guan Yi is also mentally prepared to be unable to conquer for a long time.

However, the 40,000 army and 20,000 people walked in fear for nine days on the Bao Chuan Road, and Zhao Yi, who was in the vanguard, was very excited to send a herald to report: There is a military village at the exit of the Slope Valley, but the defenders are less than 500 people. A brigade of 3,000 men appeared in front of him, and the enemy had quickly fled. At present, all the forward troops have entered Wuzhang Yuan and begun to set up camp!

"Hiss~~ Sima Wang is not a mediocre general. How could you be so careless?! No matter what, the whole army sped up its march, quickly entered Wuzhangyuan, and then all unfolded! ”

"No!"

So, what is Sima Wang doing at this time? Hey, Zichugong's life is not easy at this time.

The entire Guanzhong Corps of 60,000 people sounds like a lot, but it is not enough to use.

Chang'an, after all, is the imperial capital of the Western Han Empire and is a super city. For such a huge city, it is impossible to place 30,000 troops around it.

The importance of Tongguan cannot be overemphasized. Sima Wang sent the army to join the army of the general's mansion in the west, and Wang Tao led 10,000 people to garrison here for a long time.

The Fuyi Protector Army Department in the north of Chang'an is a place where the Di people, Qiang people, and Xianbei people who moved inward. This place is not just finished with a military headquarters, there must be soldiers, and there are enough troops to deter. So here are also 10,000 people.

In addition, there are 3,000 people in the pass, and the six roads of the Qinling Mountains, such as the Meridian Valley and the Baochuan Road, must be guarded by troops. Of course, Sima Wang is not a mediocre general, and he will not distribute the remaining 7,000 people evenly among the valley passes. At the beginning of the year, he arranged an army of 5,000 people.

But on the one hand, Sima Wang has been out of Zhenguanzhong for more than four years, and Guan Yi has been very quiet in Yizhou. On the other hand: Beidi County in the north of Chang'an, those Xianbei people are starting to be dishonest again!

In the Eastern Han Dynasty, Beidi County was a large county with an extremely vast geographical area. However, since the Yellow Turban Rebellion, on the one hand, the Han people were busy fighting the civil war, and the management of the border areas was indeed less vigorous. On the other hand, the climate of the Xiaoice River is becoming more and more obvious, and the ethnic minorities in the north continue to move inward. Therefore, in the middle and late Cao Wei period, the original vast Beidi County has shrunk by seventy percent!

And even in the remaining three percent, the proportion of the population of Hermes-Epitek is still not dominant. The dominant part here is the bald part of Xianbei.

The so-called baldness is Tuoba. This tribe later established Nanliang, one of the Sixteen Kingdoms. And the Tuoba Tribe, which was the same origin as them, later established the Northern Wei Dynasty, which "finally did not degenerate into the Seventeenth Kingdom".

In Guan Yi's time, the Bald Department was already a large Xianbei inward migration tribe with a thriving population and many branches. Its nomadic scope involves Yongzhou, Liangzhou and even Qinghai and other places that have not yet been included in the territory of the Central Plains. The population of the entire tribe was not less than 100,000. There are millions of head of livestock.

It is a pity that in this year when natural disasters are better than one day, the bigger the family, the more painful the person in charge.

As a result of the continuous drought, the grassland area has been reduced and a large number of livestock of all kinds have died. The livelihood of the bald department has been getting worse and worse in recent years.

For nomads, there are no administrative divisions, national borders, or anything like that. In their eyes, where there is abundant water and grass, there is home. Now that the grasslands in the north are disappearing, we should move south.

Moving south, it will naturally gradually enter the core area inhabited by Han people. This is something that no Central Plains regime can tolerate.

In August 267, the bald tribe began to move south from the northern part of Hokuchi County, chasing water and grass all the way to Fupyeong County at the southern end of Hokkaido County. This touches Sima Wang's bottom line.

Sima Wang's level of governance is still good. Since returning to Guanzhong in 263, he has mainly appeased the alien races of Yongliang with Huairou, and has also achieved very good results - at least for a short time, the vacuum of Yongliang has not caused a major rebellion of the various alien tribes in this place.

But this kind of Huairou has a bottom line: Jingzhao County, with Chang'an as the core, does not allow large-scale foreign tribes to enter. And where is Fuping County? It's not far north of Chang'an.

"General Zhengxi, it's not that the tree function doesn't know the rules, it's really that the weather is getting colder and colder, and the rain is getting less and less, and if the sons and daughters want to survive, they can only move south. The tree function ensures that it will only spend the winter in the north of Jingzhao County this winter, where there are Jingshui and Luoshui, and the grassland will not disappear...... When the spring flowers bloom next year, I will definitely lead the tribe back to Northland County. During the winter in Jingzhao County, we must restrain our subordinates and try not to conflict with your Jin people. If there is a conflict, we will definitely hand them over to your Great Jin government......"

The migration of more than 100,000 large tribes is certainly not something that ordinary county soldiers can stop. Therefore, Sima Wang was forced to shrink his forces, concentrate all the troops scattered outside in Chang'an just in case, and then he took 30,000 field troops stationed in Chang'an to Beidi County in the north, which was able to block the southward movement of the bald department.

The Han people of this era are still huge and terrifying monsters in the eyes of other surrounding ethnic groups. Although they were forced to survive and did not listen to the warnings of ordinary local officials of the Jin State during their southward migration, when Sima Wang led 30,000 field troops to appear in front of them, their posture was suddenly extremely low.

"Of course, this official can understand your difficulties, but look at where you are going? It's Chang'an! This is the second most important town in the world after Luoyang! Don't talk about you, even Mao Dun Shan Yu (the most outstanding leader of the Huns, who has molested Empress Lu. During his reign over the Xiongnu, the Western Han Dynasty could only endure humiliation and burden) and had never been so close to Chang'an! If you are allowed to enter Jingzhao in the hands of this official, I am afraid that this official will be left with a stench for 10,000 years. So, bald chief, either you retreat. Or, everyone fights! ”

It is definitely impossible to fight: the Zhuxia of this era, whether it is Wei Jin or Shu Wu, is not something they can afford to provoke. But you can't retreat: you can't retreat if you retreat, and you won't destroy the whole tribe. However, it is certain that a large number of livestock froze to death and starved to death, and the power of the tribe was greatly weakened. And on the grassland, the tribes whose strength is weakened will have much less chance of survival.

The two sides began to confront each other in early September, and in early October, news of Guan Yi's advance came. Sima Wang couldn't hold on.

On the fifth day of October in 267, 40,000 Han troops led by Guan Yi suddenly appeared on the Guanzhong Plain. At the same time, the 80,000 main forces led by Jiang Wei, the general of the Shu Han Dynasty, and Zhang Yi, the general of the left chariot cavalry, also set off from the Qishan camp. In an instant, he took the West County of Tianshui County at the foot of Qi Mountain. Then the whole army did not stop and rushed to Shangqi. Since Zhuge Liang's Fifth Northern Expedition in 234 AD, after a lapse of thirty-three years, Shu Han once again launched a Northern Expedition with a scale of more than 100,000 people!