The territory in the north is basically still controlled by the Hu people, and the west is Yongzhou, and the history of the assassin is Guo Huai, which is also the territory of the Wei State.

This road is very long, the Shu army first needs to occupy Tianshui, and it is also time-consuming and labor-intensive to attack and kill all the way, and it can be effective in a short time. It is worth mentioning that Tianshui's Taishou is Ma Zun, but there is a much more famous person than him here, and that is Jiang Wei.

If it weren't for Liu Hou's arrival, Zhuge Liang would have indeed tried to march from this road a few years later, and famous places such as Jieting and Wuzhangyuan were on this road. But now, Shu Han's armies are concentrated on the Eastern Front, and it is impossible for them to attack from this side by fighting thousands of miles anyway.

Cao Pi was forced to use Cao Hong due to the situation, but he didn't trust him very much, so he had to let him guard the north gate of Guanzhong, and only gave him 5,000 men and horses, which shows that Cao Pi and the Wei court are still very relieved about the north gate.

In fact, this is indeed the case, first~ After the analysis of the Wei think tanks, it is impossible for the Shu Han army to make a detour of thousands of miles and cross the border from the grassland that is still under the control of the Hu people; Second, it is also confident in Xiao Guan's defense capability.

Although Xiao Pass was built on the Great Wall, its walls and gates were easily blown up by Shu Han's explosives~ medicine, but Xiao Pass's defense system was by no means limited to a pass.

The passage into Guanzhong from Longshang is mainly the valley lowland cut by the Wei River, Jing River and other rivers. The direction of the Wei River is more steep, while the direction of the Jing River is relatively easy. Xiao Pass stands in the Liupan Mountain Pass, guarding the passage from the direction of the Jing River into Guanzhong.

That is to say, if you take the road of Xiaoguan to enter Guanzhong, you have to walk dozens of miles in the low valley with high mountains on both sides and low in the middle. These dozens of miles are places where people can be ambushed.

As long as the Wei army planted ambushes on the high mountains on both sides of the river valley, when the Shu army passed by, they could throw a few stones and kill many people. People who live in high-rise buildings have more or less been educated on high-altitude throwing and know the horror of high-altitude throwing objects.

A small object that is usually very inconspicuous is thrown from a high place, accelerated by gravitational acceleration, and reaches tens of meters underground, it will have great destructive power. In this long river valley trail, there are mostly terrain with tens of meters of mountains on both sides, and there are even many places where the cliffs on both sides reach hundreds of meters.

In such a high place, as long as a small number of ambush soldiers are ambushed and smashed down with wooden rolling stones, no matter how many people come to the Shu army, they will not be enough to die. Therefore, the Wei court is very relieved that this place, as long as the guards are not too straw, there are 5,000 men and horses, which is enough to withstand the attack of 100,000 troops.

The troops of the northern line of Shu Han made a detour this time, and they did not intend to resist the Wei army, needless to say, the cavalry was needless to say, entering this kind of terrain was only to find death, although the first division was a firearms unit, in this kind of terrain, they could not give full play to their advantages, even if they could attack Guanzhong, they would inevitably suffer heavy losses.

Therefore, the troops of the Northern Front never thought of a strong attack. The above is so long-winded, and it is to introduce the terrain of Xiaoguan, and to state the grievances and hatreds between Cao Hong and Cao Pi's uncle and nephew, which is to pave the way for this.

Since it's not a forcible attack, it's outwitting. The most thorough way to outwit is to lure the opponent's main general. As a core member of the Cao family, Cao Hong is logically said not to surrender no matter what, but with the grievances and hatred between him and Cao Pi, coupled with his greedy character, he has a theoretical basis for rebellion.

On this day, Cao Hong was pacing around the palace, and anyone who saw him would think of the phrase "ants on a hot pot". He is indeed anxious and at a loss now, according to the spies, Shu Han's army is not far from Xiao Pass.

And the messenger he sent out to Chang'an in a hurry for 800 miles had just left, and I am afraid that the messenger had not yet reached Chang'an, and the enemy army was about to descend on the city. It is known that the Shu army has invincible and terrible firearms, and in all major wars, it can be said that it is invincible and unfavorable.

When Chang'an receives the news, and then mobilizes troops to Xiaoguan for reinforcements, I'm afraid the daylilies will be cold. Besides, now that the war is tense everywhere, it is difficult to say whether the imperial court can draw reinforcements.

It doesn't matter if Xiao Guan loses it, the key is that his little life is estimated to be unable to be saved, and it doesn't matter if he loses his little life, the key is that he has worked hard for most of his life, and he doesn't know who will be cheaper with the thousands of family wealth and thousands of acres of fertile land that he has finally accumulated.

Just when he was hesitant and helpless, he suddenly heard a report from his own soldiers: "Someone outside asked to see the general, saying that he had sent a letter to the general." ”

Cao Hong was furious and reprimanded: "Bastard! When is it, where can you still take care of these acres of land, tell him to get out of the way, and wait for Ben to be free. ”

Although Cao Hong was assigned to Xiaoguan as a guard, he usually took care of the family's business affairs. Therefore, every once in a while, a family member would go back and forth between Chang'an and Xiaoguan with the accounts for Cao Hong to review.

At that time, most of the investment projects were to invest in land, and if anyone was promoted to an official and made a fortune, most of them would return to their hometown to buy land and build an ancestral house. Therefore, in the past, most of the accounts brought by the family members who came from Chang'an were about the fields.

It is nothing more than how much silver money is spent on the acquisition of that piece of land one day, how much money is paid for the sale of that piece of land one day, how many tenants need to be hired to cultivate that piece of land, how many farm tools are lacking, and so on. This time, Cao Hong also thought it was these things, so he said this.

waved off the pro-soldiers, Cao Hong continued to work there anxiously circling around, who knew that after the pro-soldiers went out for a while, they ran in again, and before he could speak, Cao Hong said impatiently: "What's the matter?" Didn't you tell you not to bother General Ben? ”

The soldiers were reprimanded, and said to Cao Hong: "General, general, someone came to say that it was a letter from the eldest prince." ”

"The eldest prince is like" Cao Honggang said halfway through, suddenly came to his senses, and raised his voice an octave and said, "What? Who do you say is the letter? ”

"Yes, it's the eldest son, the eldest prince." The soldiers were taken aback by Cao Hong, but after stabilizing their minds, they still answered smoothly.

Cao Hong's heart set off an uproar~ wave, not only him, but even the pro-soldier was shocked, as Cao Hong's pro-soldier, he still has a certain understanding of Cao Hong's family affairs.

The personality of the eldest son Cao Fu is very different from that of his father Cao Hong. He fought bravely and was not afraid of death, not much like the people of the Cao family, but had the demeanor of several fierce generals of the Xiahou family.

There is a saying that the son of a dragon and a phoenix and a mouse will make holes, I really don't know how a miser like Cao Hong could teach a fierce son like Cao Fu.

These are not the point, the key is that this pro-soldier knows that the eldest prince Cao Fu has been missing for a long time, and he has not contacted his family for so long, and now a letter from his family suddenly pops up, anyone can guess that something big must have happened.