In the fifteenth year of Jian'an, Cao Cao took Cao Ren and Xiahou Dun as the vanguard, led 50,000 troops in front, Xiahou Yuan and Yu Ban led 50,000 in the middle, and led 50,000 soldiers and horses to supervise grain and grass. (Pinyin for biqi u)

Carefully reported to Shuzhong, Liu Bei hurriedly discussed, Liu Bei said: "Today, Cao Cao led an army of 150,000 to conquer, and my soldiers and horses in Shu and Hanzhong are combined, less than 100,000, and I want to prevent Zhou Yu from attacking, but how to stop Cao Cao?" ”

Kong Ming said: "Cao Cao wants to enter Shu, and the first pass of the Hanzhong portal will not be passed." This has nothing to do with the number of soldiers. The lord only needs a military horse to sit in Yangping Pass, a few key passes in Yangping Pass, do a good job of fence village, and supply more grain and grass. ”

Zhang Fei and Guan Yu both thought that Liu Bei would punish him to guard Yangping Pass, but they didn't want Liu Bei to directly point Wei Yan and let him lead 30,000 troops, guard Yangping Pass, and deal with it carefully.

But he said that Cao Cao traveled all the way, but he saw that the mountains and rivers were treacherous, and there were many places where he needed to climb over the cliff, and the grain and grass were heavy and difficult to walk, so he broke out in a cold sweat and said: "It's so sinister, it's still unexpected, it's so difficult, if you don't make complete preparations, how dare you move easily." ”

Jia Xu and the others never thought that the road to Shu would be so difficult, they were all in the Central Plains or in the grassland, there were mountains and rivers, but after all, there were roads, how could they have seen this kind of poor mountains and bad waters.

Jia Xu said: "Now that the army has gone far, the prime minister can no longer be recalled, so he can only try to ensure that some grain and grass passes, and the speed can be a little slower, so that he must take Hanzhong in one fell swoop." Open the Bashu Portal! ”

Cao Cao nodded helplessly, and had to reluctantly move forward.

Cao Cao made a cottage bombardment cannon, at this time also brought more than a dozen, although the test effect is average, but it is much stronger than the thunderbolt, Cao Cao marched all the way, reluctant to discard, which slowed down the march even more.

Cao Ren and Xiahoudun arrived at Yangping Pass first, and went down to the village fifteen miles away from the pass.

Yangping Pass is not a Xiongguan, but its geographical location is sinister, if it is not able to capture the pass, the army can not cross.

Cao Ren and Xiahoudun knew that if they forcibly attacked the fortifications, it would be extremely difficult, so they had to rest first and wait for Cao Cao's rear team to send the bombardment cannon before attacking.

But Wei Yan didn't give the two of them this chance, Wei Yan actually wanted to fight a long time ago, and he had been forbearing, but it was to show weakness and let Cao Ren and Xiahoudun relax their vigilance.

That night, Wei Yan opened the pass and led more than 10,000 troops and horses into the camp of Cao Ren and Xiahoudun.

The two didn't know how many soldiers and horses each other, they only knew that there were fires everywhere, and the generals ran for their lives, thinking that there were quite a lot of military horses, so they were defeated, tens of thousands of military horses, at least 20,000 fell into the Jialing River, and the people who were killed were actually two or three thousand, and the rest actually fell.

Wei Yancai had 10,000 troops and horses outside, so he captured 20,000 horses, which was not easy to manage, so he removed all the captives' shirts and armor, tied them all with ropes, and sent them to the pass.

Wei Yan won a great victory in the first battle and reported to Chengdu, Liu Bei was overjoyed, and ordered the rear army of the governor to escort the prisoners to Fangling and began to build a new city.

On the left side of Fangling, a hundred miles southwest of Wudang Mountain, Liu Bei built Shangyong City here, and prepared to garrison a force here, in case Cao Cao attacked Hanzhong from Nanyang to the west.

Cao Cao didn't expect Hanzhong to be so difficult to enter, the loss of 50,000 troops and horses in front, Xiahoudun and Cao Ren only led one or two thousand remnants of the army back, Cao Cao was furious, so he wanted to behead the generals, persuaded left and right, Cao Ren and Xiahoudun Fang avoided death.

Poor mountains and bad waters, these tons of sky-bombing cannons really can't be transported, Cao Cao had to give up, only fate to have some grain and grass to Yangping Pass.

When I went to Yangping Pass, I saw that Wei Yan only went down to the fence by the mountain, where was the road.

The mountain is simply a cliff, the water is under the cliff, and in some places, it can only happen to be a single horse, even if Cao Cao still has an army of 100,000, he can only sigh.

Cao Cao didn't know that if it weren't for Liu Bei and Liu Zhang's flanks at that time, this Zhang Lu, with a population of more than 200,000 in Hanzhong and less than 50,000 military horses, would have survived to Jian'an for 20 years.

It has only been 15 years since Jian'an.

If Zhang Lu hadn't surrendered to Cao Cao, it is estimated that he would have to hold on for a while.

Cao Cao was ten miles away from Yangping, and did not dare to enter again, so he set up camp.

When Wei Yan learned that Cao Cao was there in person, he was very excited and discussed countermeasures with the generals.

The generals were puzzled: "Today, Cao Cao's army is 100,000, and the general only has 30,000 military horses, but why are you still excited?" ”

Wei Yan said with a smile: "In order to avoid leaking military planes, I didn't inform you before, but now that the big war is coming, I can finally talk to you." ”

Wei Yan ordered someone to carry out a box of black iron balls, and said to the generals: "Military wizard, only from the Chenhe Chamber of Commerce to blow up the mountain and open the way, analyze its composition, imitate the projectile of the bombardment cannon, although there is no bombardment cannon today, but it can be carried by the flying ball, put into Cao Ying, burn its grain and grass, Cao Cao will be chaotic, I will take advantage of the chaos to attack it, how can Cao Cao be lucky!" ”

The generals already knew the power of the Sky Bombardment Cannon, and when they saw that this thing was the ball of the Sky Bombardment Cannon, they all took a few steps back.

Wei Yan laughed.

"This is a dead thing, don't be afraid, this thing only ignites the lead on the hole to produce an explosion, and the power is worse than the heavenly ball. It is said that four or five of these balls can be worth one, but it is more than enough to burn its grain and grass. ”

Wei Yan had this move, Cao Cao also knew this trick, and both sides had flying balls, so in broad daylight, both sides of the flying balls flew up and flew towards each other, and more than 200 flying balls met in the air.

The strong crossbow invented by Zhuge Liang played a role at this time, and the two sides were extremely far apart, so they began to fire crossbow bows, and Cao Cao's flying balls fled one after another.

Two or three hours later, Cao Cao's grain and grass camp, bombardment shells fell from the sky, the camp was on fire in all directions, the soldiers cried and ran, Cao Cao was shocked.

"Could it be that Yang Xi handed over such a divine object as the Sky Bombardment Cannon to Chengdu?" This was Cao Cao's first doubt.

Jia Xu said: "That's not right! There is still a certain gap between this thing and the Sky Bombardment Cannon, not the Sky Bombardment Cannonball. Prime Minister, now that the grain and grass have been attacked, there is no way to continue, and the Prime Minister should retire as soon as possible! ”

Cao Cao shook his head and sighed, so he had to order the withdrawal of the army, and ordered Cao Ren to lead the army to ambush to prevent Wei Yan from following the sneak attack.

Ambush in the mountains and forests, the flying ball is difficult to detect, but it also has some effect. But Wei Yan is not a mediocre person, how could he not be counted at this point, after repeated exploration, he finally found a trace of clues, so he did not go out.

Since then, Cao Cao has given up the idea of using Yangping to enter Hanzhong, and has instead set his sights on the Yangtze River.

Cao Cao occupies Nanjun, which is the north bank of the Yangtze River, and can directly enter Bashu from the Yangtze River.

However, since Yang Xi is the overlord of the Yangtze River, Cao Cao has to ask Yang Xi if he agrees if he wants to build the Yangtze River Water Army.

Obviously, Yang Xi did not agree that his water supremacy was challenged, and Cao Cao had no choice but to give up for the time being.

Regarding the war between Cao Cao and Liu Bei, Yang Xi turned a blind eye and did not want to benefit from it.

At this time, Yang Xi was copying a book written by Charles Darwin and titled "The Origin of Species".

Although the theory of evolution expounded on the origin of species has been questioned by many in later generations, it is still very advanced for the understanding at this time.

Yang Xi elaborated on two views, the first is that species are changeable, living things are evolved, and any current living beings, including humans, have evolved. The second is that natural selection is the driving force of biological evolution. Natural selection, survival of the fittest.

Yang Xi did not know that the work he was carrying out had already begun in Rome in the West three or four years earlier.

And on that side, there are five or six people who are doing the same work as Yang Xi, but Yang Xi is one step slower than the West in this regard.

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