Yang Yi's current policy towards the Ji Han regime in Shu is to recuperate, that is, to keep the enemy out of the country, so these fortresses are very important.

For example, Hanzhong County, as a "thousand-year-old city" with mountains and rivers interdependent, is an important birthplace of the Han Dynasty, with the Qinling Mountains in the north and the shallow foothills of Pingba Mountain in the south, which is the only place to pass through from the land of Guanzhong to Shuzhong.

Hanzhong has always been a place where soldiers must fight, it is the birthplace of Gaozu in that year, and it is also the military important place of the Northern Expedition of the first prime minister, the general Jiang Wei inherited the will of the first prime minister, ran Hanzhong and Longnan, and sent troops nine times, the northern expedition to Cao Wei, and there were victories and defeats of each other.

The general Jiang Wei implemented the "gathering of troops and valleys" in Hanzhong to resist the enemy, and it cannot be said that this strategic policy is not working, but it failed for various reasons.

Hanzhong is indeed the gateway of Shu, when Liezu was still the king of Hanzhong, he left Wei Yan to guard Hanzhong, and heavily armed in each siege to resist foreign enemies, so that the enemy could be blocked outside the pass, unable to enter Hanzhong, the battle of Xingshi, Wang Ping resisted the attack of Cao Shuang of Wei State, which was used by this method.

But with decades of stalemate, the difference in strength between Wei and Han is getting bigger and bigger, at this time there is no such civil and military talent as the first prime minister, the economy of Shu is naturally better than the Wei State, which occupies seventy percent of the world, and the general Jiang Wei also believes that this strategy is old and heavy, and can resist the enemy, but can not win a big victory.

Therefore, it is inclined to let the enemy army enter Yangping Pass, while the Han army retreats to the two cities of Han and Le, leaving heavy troops to guard the important passes, and then sending an army to fight guerrilla attacks to attack the weak links of the enemy army.

In this way, the supply line of the enemy army can be lengthened, and the enemy can not get food and grass replenishment on the spot, and in the long run, the enemy army is exhausted, and when it returns, the defenders of the cities and the guerrilla army take the opportunity to attack together, so that the enemy army can be annihilated. It is a bit similar to what later generations often said, that is, "closing the door and beating the dog" in the art of war, or gathering and annihilating.

Jiang Wei is in Tuntian, which is a small basin surrounded by Minshan and Dieshan Mountains, and the reason why he is stationed in Hanzhong instead of Hanzhong is to implement his above-mentioned strategic intentions.

In addition, this is a basin, which is indeed conducive to tuntian and solves the problem of food shortage in Han land; In addition, Jiang Wei proposed to Liu Chan to kill Huang Hao at that time, but Liu Chan refused, because he was worried about being plotted by Huang Hao, so he stayed away from Jinguancheng Tuntian to avoid trouble.

As a general, he led heavy troops outside, and others naturally did not dare to act rashly, but he could play a strategic deterrent role in the southward Wei army at any time when he was stationed in the middle of the army.

As for the breakthrough of several armies of Wei last year, the main responsibility is not the failure of Jiang Wei's strategy, but the waste of the government and the improper use of people within Ji Han, such as Jiangyou Pass and Jianmen Pass, there are traitors in several places, even Jiang Wei can only fight hard.

Strategically, since there is no problem, Yang Yi will naturally continue to use it.

The first is Hanzhong County, which is the top priority, Hanzhong is directly up to Chang'an, which directly threatens the former capital of the Han Dynasty, and Chang'an may shake the entire Guanzhong if it moves, so the ancestor and the prime minister tried their best to take Hanzhong.

Occupy Hanzhong, defend is the gateway of Shu, and attack is the springboard for attacking Guanzhong and the world.

And Yuzhong is in the left of Hanzhong, which is the heart of Liangzhou, which is actually the middle policy left by the first prime minister back then.

And Ji Han after the first prime minister and the general Jiang Wei's several expeditions, Ji Han in the Liangzhou territory is naturally encroached on a little something, the territory is more developed than before, Tuntian is in the middle of the field, it can play a role in stabilizing vested interests, accumulating grain and grass, and laying the foundation for further encroachment, although it is not a direct threat to Chang'an.

However, as long as Hanzhong is held, the safety of Shu will be fine, Jiang Wei's mistake lies in the defensive strategy, he has not controlled the overall situation, if the defense of the north is completely controlled by him, naturally there will be no such difficulty.

Of course, if it goes on like this, he is likely to be the same as the former prime minister back then, and finally end up exhausted to death.

It is not a lie that Shu is easy to defend and difficult to attack, when Wei Yan guarded Hanzhong, he said at that time that Cao Cao's pro-command army could let him return in vain, that is, Hanzhong should stick to the border passes, and it would be useless for many people to come.

Jiang Wei didn't want to delay it like this, and he also felt that he would lose if he defended for a long time, so he changed Wei Yan's defensive strategy, contracted the defense, and withdrew the main force to Nanzheng, resulting in a passive defense.

Of course, Jiang Wei didn't know that he would be forced to go to Tuntian, if Jiang Wei was in Hanzhong at that time, even if he started to be passive, his talent would be enough to turn it back, but when he left Hanzhong, he lacked the most direct control of the situation, resulting in a late reaction to be attacked by Zhonghui Deng Ai.

If Jiang Wei is in Hanzhong and ensures that the situation in Hanzhong is stable, Deng Ai will succeed in smuggling Yinping, and he will not be able to leave the Sword Pavilion, and he will be able to destroy him with a small team.

Yang Yi actually also considered whether to change the strategy, Wei Yan's tactics were also very good, and they were very good for defense, so that for many years after Wei Yan's death, Ji Han's defense strategy still followed his methods, and he never lost land.

However, after Yang Yi thought about it, he still used Jiang Wei's strategy, and he would lose if he defended for a long time, so he had to fight a defensive counterattack.

Wei Yan's strategy can certainly keep the enemy out, but it also leads to this becoming a confrontation between the two sides and consuming national strength, just like Sima Yi has always been building cities and building cities with the first prime minister, Ji Han only occupies Shu land, and the territory is small, and at this time, the national strength of Wei is five to ten times that of Ji Han at this time, so it has taken decades, and it is the family business that the first prime minister worked hard to run back then, and it is a little inexhaustible.

Then take advantage of the geographical advantage, occupy the favorable terrain, choke the throat, let the opponent's large army come in, the main strongholds are not lost, play defensive counterattacks, if you can annihilate the main force that has passed, you can go down to the middle of the pass.

There is not much of a problem in this strategy, but the fact is that the DPRK and China did not use personnel properly, and Jiang Shu, the deputy general of Yang'anguan, defected, resulting in the loss of this important stronghold of grain and grass in the tunju quickly, and then the strategy of defensive counterattack naturally went bankrupt.

In the case of poor hard fighting, the strategy is aggressive, and he wants to take advantage of the geographical advantage to play a defensive counterattack, which is a bit of a gamble on the national fortune, but unfortunately he lost.

If it was the first prime minister to unify the army, this kind of risky thing would definitely not be done, but from a realistic point of view, without taking risks, Ji Han really did not have much hope of defeating Wei, and the Wei country that the first prime minister hoped for had changed, but such a big change as Sima's usurpation of power was quickly extinguished in Wei.

And Jiangdong's Sun Wu is really a waste, there has never been a real threat to Wei, he has always been sending experience and prestige, but Ji Han is facing strong generals, such as the general Jiang Wei is opposite Zhong Hui, who is known as Wei's son.

Hanzhong Taishou has the longest tenure in Wei Yan, and his successor is Lu Yi and then Wang Ping.

It's just that at this time, Jiang Wei no longer regarded Hanzhong as a military center during his reign, and Ji Han's strategic intentions were already biased towards Longxi, which was also forced by current events.

Jiang Wei fled to Zhongzhong because of the Battle of Duangu in the past, his reputation plummeted, and the supporter Shang Shuling Chen Yi passed away, and the situation was already very critical when Jiang Wei was recalled to the DPRK.

He wanted to re-establish his prestige through his military exploits, so he changed the defense of Hanzhong in the above table, and abandoned the strategy of rejecting the enemy from the country that Wei Yan had continued.

Jiang Wei sent troops to wait for peace at that time, and was defeated by Deng Ai again, Liao Hua had bitterly persuaded Jiang Wei before the battle, and if there was another mistake at this moment, Jiang Wei would completely lose power.

As a result, Jiang Wei was afraid of the consequences of this defeat, so he took refuge in the front line, while Deng Ai and Jiang Wei's two armies confronted each other.

This also made the Wei army clear about the location and strength of the Han general Jiang Wei, and then Deng Ai made a desperate bet and summoned the four county guards to jointly encircle and suppress Jiang Wei, which was also agreed by Zhong Hui and Sima Zhao.

After all, Ji Han only has more than 100,000 troops, and since the main general Jiang Wei is in the middle of the army, and there are 30,000 or 40,000 soldiers and horses in Tuntian, it is not difficult for Sima Zhao and Zhong Hui to judge that there are loopholes in Hanzhong's defense.

Yuzhong is on the left side of Hanzhong, militarily, there is indeed no geographical location in Hanzhong, after all, although Hanzhong is important, but as long as Hanzhong is held, it is equivalent to guarding the gateway to the center of Shudi, as for why Jiang Wei wants to station the main force in Hanzhong, in fact, Jiang Wei has fundamentally given up the intention of attacking Wei from Qishan after the Nine Expeditions, and has the intention of taking refuge, and also wants to recuperate in Qizhong, and then tried to divert Qishan, made a big detour to the left, and suddenly launched an attack from Longxi County to the east, In this way, you can unconsciously bypass the heavy defense of Wei, easily pass through the pass of the heavy defense of the Wei army, and wave your division all the way to Chang'an.

Of course, Jiang Wei's move is a risky move, which is possible under the condition that only the Han army attacked the Wei army in the past, but the things in this world are often unsatisfactory, the Wei army changed its strategy at this time, changed the normal state of only defending and not attacking in the past, and the troops were divided into four ways from Jincheng County, Longxi County, Tianshuidu, and Chang'an to attack the Han army, and the day was in front of Jiang Wei, which made Jiang Wei unable to react at all, and hurriedly waved his division to the Sword Pavilion to block the Zhonghui army.

Unexpectedly, the Wei army and Deng Ai bypassed Jiang Wei all the way, strangely out of Yinping, broke through the Jiangyou Pass, and approached Jinguancheng, the Ji Han Dynasty was panicked, and Liu Chan actually fell, at that time, the Han Kingdom seemed to have reached the end of the road, and the border pass was even only Jiang Wei all the way to deal with the Wei State's four-way army, even if Jiang Wei was stationed in Hanzhong, it was also difficult, not to mention that Jiang Wei was only stationed in Hanzhong.

What is certain is that Jiang Wei was stationed in the middle of the army, committing a taboo, and what Jiang Wei did not expect was that the Wei State was unusual, changing the past from only defending and not attacking to taking the initiative to attack from four directions, which was a fatal mistake in the strategic judgment of the Han State, and it had little to do with where it was stationed.

Yang Yi had a deep conversation with Liao Hua, and also knew that one of the reasons why Jiang Wei went to Tuntian in Zhongzhong was to avoid trouble, which was the idea that the secretary Lang Hezheng gave Jiang Wei at that time.

Why did General Jiang go to avoid trouble?

Jiang Wei's ninth attack on Wei, first attacked Taoyang and then fought Qishan, when the fierce battle was in full swing, Liu Chan was recalled by three edicts a day, Liu Chan listened to Huang Hao's slander at that time, and initially wanted to replace Jiang Wei's position as general Yan Yu, but then gave up because he was afraid that the Wei army would be strong.

You must know that Jiang Wei was summoned to Jinguan City at that time, although he was in the city, it was not easy to see Liu Chan, and the situation at that time also showed that Jiang Wei, a general, was in danger.

Therefore, Yin Zheng said that the general has military power outside, and people can't try to; It can be seen that Jiang Wei first protects himself, as for why he went to Cangzhong and didn't stay in Hanzhong?

According to what Yin Zheng said at that time, the land in the middle of the land was extremely fat, and the tuntian was used to fill the army; The two can be used to benefit the counties; The three Wei people did not dare to face Hanzhong.

Yin Zheng said that this is a policy to protect the country and live in peace; However, the biggest flaw in this strategy is that why did the supreme military commander take a hundred elite soldiers to help plows and farm?

It's just that there was no other better choice at that time, if he didn't go, Jiang Wei might die in Jinguan City, a glass of poisonous wine or a foot of white silk was very likely.

The monarchs and ministers of Wei were not stupid at that time, Wei engaged in Zhonglang Xun Mian once said: Liu Chan, the lord of Shu, is drowning in wine, credit Huang Hao, and the ministers all have the heart to avoid disaster.

And the reaction of Sima Zhao, who was in power at that time, was to laugh, their Sima clan has always wanted to usurp the throne justifiably, but the Han dynasty is not endless, even when Cao Pi ascended the throne, it is also unjustifiable, and he usurped the throne again Wouldn't it be a shame for future generations.

Therefore, this made him see the opportunity, and even promised the benefits that the Han clan should have, but it also arrived early.

So at that time, Jiang Wei avoided trouble, and it was said that it was better to stay in Hanzhong, and there was no land to plant in Hanzhong?

But Jiang Wei's situation at that time, the conclusion was that Jiang Wei could not stay in Hanzhong, Jiang Wei had been presiding over the military in Hanzhong, and the nine expeditions he presided over were all initiated from Hanzhong.

However, the internal opposition to him became louder and louder, and the ninth time the army was raised, such as the leader of the Shi clan, Qian Zhou, who simply went on strike to express his opposition.

Even the veteran Liao Hua directly opposed the use of troops, and using Yan Yu to replace Jiang Wei was just Liu Chan and Huang Hao's idea?

I am afraid that there is a great public opinion base for Jiang Wei's military power to transfer Jiang Wei back to Chengdu, among which the public opinion is naturally those scholars, if the Han Kingdom is destroyed, their family will continue to inherit, and they will naturally have different thoughts, then, Tuntian is a last resort.

Jiang Wei could only leave Hanzhong, the first-line military center, and the Northern Expedition group was dismantled. , However, Jiang Wei did not return to Jinguancheng gloomily, and he still had tens of thousands of soldiers and horses in his hands, which was that the loyal ministers of the Han Dynasty were not completely extinct, and this possibility was preserved.

It's just that once such a situation was revealed to the world, Deng Ai waited for the opportunity, and Sima Zhao immediately began to prepare for the destruction of Shu, so Zhong Hui Deng Ai and Shu, the wise people all said: Breaking Shu must be done! The danger of mountains and rivers is not enough, the people's hearts are solid, the country is solid, and if the people's hearts are scattered, the country will die.

When the Han general Jiang Wei was 27 years old, he was defeated and surrendered to Shu, and was favored by Kong Ming, that is, he asked Liu Chan to make Jiang the marquis.

At this time, Yang Yi naturally learned from what the prime minister did back then, remained vigilant in the external military, and had the strength to base the enemy, before starting internal reforms, and when the world changed, he went on another northern expedition.