When the Yellow River arrives at Tongguan here, because it is blocked by the Huashan Mountains, it turns to the east, at the corner of the Yellow River, there is a place where soldiers must fight, that is, Fenglingdu, the ancient battlefield of Wei and Qin is here, Cao Cao and Ma Chao, Han Sui also had a fierce war in this area.

At the beginning, Liu Yi actually wanted to capture the Fengling Ferry, but this place is located in the east of the river, pinching the throat, easy to defend and difficult to attack, and the opposite bank is a cliff, it is difficult for the army to climb, and it is difficult to see the situation on the opposite bank from this side.

And this time, Sima Yi is talking about the dam being built here.

"Find out who built this dam!" Liu Yi looked at the embankment in the distance, and a flash of amazement flashed in his eyes.

The water in this place is turbulent, and it is very difficult to build a dike, but someone can build a double dike, even Liu Yi is not sure to build a dike.

"Governor, this levee is very powerful?" Jiang Wei looked at Liu Yi curiously.

"Hmm." Liu Yi nodded: "The water here is turbulent, so to tell you, a thousand catties of boulders thrown down, can be washed out by the water potential here for several miles before it can land, and the water depth is ten or even twenty zhang, drainage or interruption can not be done, can only put ten thousand catties of boulders, but can not be thrown indiscriminately, want to build a dam in this kind of place, I may not dare to say that it will be built, this root does not matter how much manpower is invested, even if it is really built, you have to ensure that it will not flood both sides of the strait, causing floods, otherwise the first unlucky is the garrison of Fenglingdu." ”

Jiang Wei has also specialized in the study of Tiangong Kaiwu over the years, and he is no stranger to the terminology, Tiangong Kaiwu is not just a craftsman, the most fundamental part of it is mathematics, which is also quite effective in the art of war, Jiang Wei has read it many times over the years, and he admires Liu Yi more and more.

At this moment, he looked at the embankment and said, "I don't want to have such people in the territory of Wei. ”

"The world is big, talents are like carp crossing the river, it's a pity, such talents in the Wei realm, after all, can not play their greatest effect, inquire about the location of this person, if you can destroy Cao Wei in the future, this person must be saved!" Liu Yi nodded, and then took Jiang Wei to investigate the surroundings.

Although Liu Yi was amazed by the ability of the other party, he did not believe that someone could build a dam under the existing conditions with manpower.

Liu Yi estimates that even if he wants to do this, he may have to do it after the steam engine is completely popularized.

It's not that he doesn't believe that there are people in this world who are better than him, but he doesn't believe that in the existing technical environment, someone can do this kind of thing, Liu Yi wants to take a closer look.

"Governor, what's the use of looking at this?" Jiang Wei accompanied Liu Yi to walk around the neighborhood, and in the evening, Liu Yi set up a camp in a leeward place and began to build a sketch, Jiang Wei couldn't help but ask.

Isn't the most important thing at the moment to defeat the Wei army, cross the river and attack Hanoi, and then advance to Jizhou? Why did you come here to study someone's dam?

"The key to breaking the enemy is still here!" Liu Yi said with a smile while drawing the map: "Then Sima Yi has set up two dams, Boyo should be able to understand why Sima Yi has been provoking before, right?" ”

"He wants to lure our army back to fight, and then dig the dam again and wipe out our army!" Jiang Wei said with some fear.

"Not bad!" Liu Yi nodded, and he was a little afraid in his heart, fortunately he was cautious, otherwise, if he really went back to set up camp again, I am afraid that he would really be recruited.

"In this case, we just need to dig the dam again, won't we be able to break his plan?" Jiang Wei said with a smile.

"Hey~" When Liu Yi heard this, he shook his head and said: "But there is no such good thing, since he is attacked by water, then I will also set up a mechanism to let him taste the taste of being attacked by water!" ”

"Redirect the Yellow River?" Jiang Wei looked at Liu Yi in surprise: "This ......"

Impossible, right?

"It's a little unbelievable, it was really impossible, but with this dam it's different, the water potential of the Yellow River has slowed down a lot because of this dam, and the impossible has become possible, I'm going to find a place to make a diversion device, if this dam is not opened, but if the dam is opened, the river can be diverted to the other side!" Liu Yi smiled and said: "Then Sima Yi is waiting now, when we move the military camp back, once we move back, the dam will be dug immediately, and when the time comes, I want him to be cocooned and bound to himself!" ”

"Governor's clever plan!" Jiang Wei said with a smile.

It's not a clever plan, and even this kind of strategy can only be used by Liu Yi alone, looking at the world, I am afraid that only Liu Yi and the person in Wei Guozhong can build this dam.

"If it succeeds, it's a clever plan, if Sima Yi dodges it, it's not a clever plan!" Liu Yi shook his head, there is nothing wonderful about this thing, when encountering an opponent like Sima Lao Fox, as long as it can be successful, no matter how simple the strategy is, it can be called a clever plan, when encountering ordinary people, Liu Yi can also speculate on the other party's behavior pattern based on his own experience, but for people like Sima Yi, Liu Yi can't guess it, he thinks this strategy is very useful, but whether it can succeed in the end, this is really uncertain!

"The problem now, the first is to make things, and the second, and most important point, don't make that Sima Yi suspicious, this person is a ghost!" Liu Yi said with a smile while doing sketch calculations.

"Dudu, is Sima Yi really so powerful?" Jiang Wei looked at Liu Yi and asked with a frown.

"If you talk about the art of strategy, I am far inferior, I am in the court, I can fight with him, I am afraid there are only Kong Ming, Shi Yuan, now can confront him, our armor far surpasses the other party, head-on confrontation, even if I am not as good as him, but the army's combat power, weapons and armor, enough to make up for it, plus I am cautious enough, so Sima Yi has no chance to take advantage of it, if I let the two of them fight fairly, I am afraid that I am far from his opponent." Liu Yi took a measuring stick and measured the distance, then shook his head and sighed: "You don't need to compare me with these famous generals, I can't beat any of them if I really fight." ”

"The Governor is too humble." Jiang Wei just listened, if Liu Yi can't fight, then how many people in this world can? At least during the period under Liu Yi's command, Jiang Wei felt unusually harmonious, whether it was the coordination between the various armies or the distribution of material supplies, it was extremely smooth.

It's just that in terms of logistics scheduling, there are very few people in the entire Han Dynasty who can do Liu Yi's step.

"Humility?" Liu Yi shook his head: "Many people think that I am humble, don't talk about this, go and do things, you send someone to calculate the height of the nearby mountains, the depth of the water, the softness of the soil on the bank of the river, and the trend of the river from here to the downstream, to be fast, we have to find a suitable terrain as soon as possible." ”

"Whoa!" Jiang Wei bowed down and said yes, turned to leave.

In the next few days, Liu Yi made a fluctuation meter, took people to survey the water potential during the day, measured the width and depth of the river, measured the water level in the gentle place of the water potential, and built a sand table at night to simulate the terrain in this area, and ran all over the area for hundreds of miles, and Liu Yi found a suitable place to start construction.

He also ordered Jiang Wei to take people across the river and make some stone formations on the other side of the river according to Liu Yi's drawings, as a way to prevent people from running to make trouble or notice Liu Yi's movements here.

Liu Yi moved the temporary station here again, meditated for a night, and drew the drawings of the water distribution and the required equipment.

These days, Liu Yi also figured out the principle of the reservoir, but he ordered people to hollow out the bottom of a boulder from the mountain, and put a whole rock into the water to build it.

But Rao is so, the person who can come up with this method is enough to make Liu Yi admire, this time Liu Yi is also using the terrain to dig a ditch on the opposite bank, but the river level will not go to this ditch every day, and even the diverter he made will not sleep, but once the river surges and touches the mechanism left by Liu Yi, the nearby stone mountain that has been hollowed out in advance will fall down directly, blocking the river and forcing the river to flow to the ditch, and the downstream is Sima Yi's camp.

In order to ensure that he could achieve the desired effect, Liu Yi also set up more than a dozen similar mechanisms along the way, and dozens of ditches of different lengths were designed to bring water from the river to Sima Yi's camp.

At the same time, Liu Yi went to the top of the Fengling Ferry and strengthened the dam to enhance its water storage effect to achieve sufficient water.

The five hundred rattan armor soldiers played a relatively large role at this time, and they could cross the water to the other side at any time with the power of the rattan armor.

In this way, it took a full month to do all the organs well, Liu Yi made sure that there would be no problems again, and then returned to the camp with the men and horses, at this time it was already June, the weather was unbearable, and the Wei army would send a small group of men and horses to test it from time to time, although Wei Yan obeyed Liu Yi's orders and did not go out of the camp easily, but these small groups of people and horses would not let them jump under their noses, and send elite troops to snipe these small groups of Wei troops everywhere.

"Governor, how long are we going to stay here?" After Liu Yi returned to the camp, Wei Yan quickly came to him, and the battle report came back from the south these days, that Cao Shuang was designed by Liu Cheng in Yang'an, and tens of thousands of Wei troops were damaged, and Pang Tong also took Hefei and other places into control in Shouchun, and the war in the Central Plains was fierce, but they could only stare here, how could Wei Yan endure it?

"It's coming." Liu Yi shook his head and said with a smile: "Wen Chang, don't worry, next time, if Sima Yi takes the initiative to come to fight, we will send troops!" ”

Although he is prepared, he must not be easily led out by Sima Yi, and he must do a full set of acts, lest Sima Lao Thief see the flaw and withdraw his troops in advance like last time, then this battle will really only be left with dry staring.

"Newspaper~"

At this moment, a junior colonel came in outside the tent, bowed to the two and said, "Governor, Xiahou Ba, the general of the Wei army, led the army to cross the river and set up camp on the riverside!" ”

"Governor!" Wei Yan looked at Liu Yi with a happy face when he heard this.

"Sima Lao'er is ruthless enough!" Liu Yi seriously flashed a look of surprise, nodded and said, "Wen Chang, you immediately order troops to go out and drive that Xiahou Ba back!" ”

"Whoa!" Wei Yan was overjoyed and took the order to leave.