Zhou Yu replied to Li Su's letter of war, but in the end he did not fulfill his promise, but broke his promise and adjusted it slightly.

However, this adjustment did not change the final result. After weighing the trade-offs, Li Su found that it was harmless and even made it easier for him to secretly deploy more operations. So after replying to Zhou Yu’s letter of complaints about his breach of trust and taking some moral advantage, he also made a fortune in accepting the incident and continued to fight.

The middle is just like a little behind-the-scenes happening.

The content of this behind-the-scenes footage is very simple - according to Zhou Yu's plan, the two sides would have made a battlefield at the estuary of the Zhongjiang River flow into Taihu Lake on the second day of August, and Zhou Yu rushed up and fought with both sides.

But in fact, the date of the final battle was delayed to the fourth day of August, two days late.

The reason for the lateness is that Zhou Yu’s “weather forecast” is really inaccurate. Before the typhoon landed, it delayed for two more days.

There is no way, the running speed and time of the typhoon are really hard to estimate, and the error is normal for a few days.

Li Su would not wait for Zhou Yu in vain, so Zhou Yu needed to fight for the condition of delaying the final battle. The specific way to fight was to resist and stand for two days while retreating from Niuzhu to Taihu Lake along the Zhongjiang River.

The price of every day is that Zhou Yu's army will have to kill thousands of people in battle, while Li Sujun on the opposite side will only kill hundreds of people in battle, and the difference in combat losses between the two sides in this way is at least five times more than!

There is no way. After all, it is blocked in a small river to fight water. Both sides have long snake formations, and only snake-headed troops can be put into battle. The troops behind have to wait for the front row to die and the team to be destroyed. At least the warships sink, before they can be replaced to fight.

In this combat environment, Li Su's warship has a large tonnage, a condescending size, strong armor defense and strong firepower, and there is no strong wind. It is natural that Li Su's navy suppressed Zhou Yu and scored more than five times the battle loss ratio.

Zhou Yu really had no choice. If he couldn't wait for the strong wind or the advantage of the battle at the mouth of Taihu River, he would definitely have no chance of winning.

In fact, what he finally waited for was not a typhoon that happened to pass through Taihu Lake. He just needed a strong wind that was equivalent to the level 6 or 7 of later generations. Therefore, it doesn’t matter if the typhoon path is 300 to 400 miles apart, but it is still in a tropical low-pressure wind circle anyway.

After all, a ship with a 10,000-ton ship sailed in the tenth level of wind, and a typhoon-level 80,000 tons could only withstand it. If a ship with a dozen meters of iron boats is on the sea, a 8th level of wind may also sink. On the surface of Taihu Lake, a 6 or 7th level of wind can blow over the tower ship.

Li Su's number of troops is no less than him, and his fire prevention work is so good. Zhou Yu has been blocked by the opponent for many attempts to attack fire. Zhou Yu is so smart that he can get rid of his wiseness.

At the same time, Li Su did not wait for Zhou Yu. In order to further pressure and prevent Zhou Yu from changing his mind, he also assigned about 10,000 troops to prepare for the siege of Jianye and went north to set up camps at the mouth of the Qinhuai River to build equipment.

In this way, even if Zhou Yu changes his mind, Li Su can force Zhou Yu out, or put the benefits at his mouth first.

...

With their own plans, the final battle of Taihu Lake finally began on the fourth day of August.

Li Su brought the combat forces on the Jiangdong front. Before entering the truce period in June, there were about 100,000 people - 60,000 were veterans who Li Su had used when he annihilated Sun Ce at the beginning of the year, and 40,000 people included 20,000 Yuan's prisoners of war. Gao Shun drew the replaced troops after the expansion of the army in Wancheng.

Later, during the stalemate, Li Su took over Gao Shun's new reinforcements from thousands of people, and also collected prisoners of war from the restoration of Jiangxia and Chaisang County, defeated the troops, reorganized and adapted them, and mixed them into the old troops who were reduced.

After several additions, Li Su's total force used for the decisive battle this time reached a huge 120,000 people, and he definitely had an advantage - not only did his ships be better than Zhou Yu, but his weapons and equipment were much stronger, and even his number was more than Zhou Yu. No wonder Zhou Yu knew that he would never have any chance without a surprise plan.

In contrast, Zhou Yu on the opposite side had been weakened many times before. When he entered the stalemate stage in June, due to Huang Gai's destruction, Zhou Yu's troops on the front line had fallen below 40,000. Fortunately, there were still 50,000 or 60,000 Cao Cao's naval troops at that time, so the total force was still more than 90,000.

In the past two months, Zhou Yu also took advantage of the stalemate stage and finally exhausted the lake and expanded the army, trained the new army crazily, gathered the remaining soldiers and defeated soldiers, and recovered various blood, but he only barely recovered to more than 110,000 people, which was nearly 10,000 less than Li Su.

However, in the previous defeat, in order to delay enough time and lead Li Su to the appropriate battlefield in Zhou Yu's mind, every step of this operation would have to lose its strength.

Just say that the delay caused by the late typhoon was delayed and the additional damage was caused. Every day, the battle was fought to the death, weakening thousands. So on the fourth day of the August 19th, Zhou Yu's total strength still fell to 90,000.

Fortunately, Zhou Yu’s only good news is that Li Su cannot put all 120,000 people into the front battlefield.

He needed to leave people in Chaisang to prevent Cao Ren from attacking Jiangbei from being attacked, and he also had to distribute 10,000 people to the Qinhuai River estuary outside Jianye City to prepare for the siege, and acted as a decisive battle against Zhou Yu to prevent Zhou Yu from remorse.

In the end, Li Su also distributed more than 10,000 people to Gan Ning, and intercepted Zhou Yu in the back and tried to escape from the rivers on the east bank of Taihu Lake to the East China Sea after his defeat.

These complete preparations also occupied Li Su's 30,000 people, so his and Zhou Yu's troops were almost the same on the front battlefield of Taihu Lake.

Ninety thousand people beat 90,000, which is very fair.

...

On the fourth day of the August 19th, early in the morning, Zhou Yu gave up the estuary of the Zhongjiang River flowing into Taihu Lake as promised.

When he noticed that Li Su's fleet was approaching the river estuary along Zhongjiang, Zhou Yu asked his outpost fleet to keep a distance, and finally gradually controlled the rhythm and retreated to a position thirteen or fourteen miles away from the river estuary.

Li Su's fleet was at least seven or eight miles apart from Zhou Yu, which was the distance from the horizon that you could just see the heads of the opposite person exposed from the horizon.

On the lake, because the people standing on the boat are higher than those standing on the flat ground, according to the curvature of the earth, people standing about ten to twelve miles away can still see a head (there is only one black spot, and people with good eyesight). Experienced sailors and watchers know how to estimate and maintain distance between the two sides.

During the process of gradually retreating, Zhou Yu also tried to slow down the retreat speed, but as soon as Zhou Yu slowed down, Li Su's fleet on the opposite side would also slow down. It seemed that he would be ready at any time and then retreat to Zhongjiang, which was very alert.

According to the pre-war agreement, Zhou Yu should retreat to a place twenty miles away from the mouth of the river. Li Su would slowly set up a formation seven or eight miles apart from him, that is, he would have a fan-shaped water area with a radius of twelve miles to deploy his fleet.

Then the two armies were like the knightly styles in the Spring and Autumn Period, and they were slapped with a stick.

Of course, Zhou Yu was unwilling to really implement the gentleman's agreement 100%. He thought to himself: "If he really fulfills the contract completely, according to Li Su's current alertness, he would have a fan surface that is almost a diamond-shaped like a fan.

With such a large area, it is easy to accommodate 100,000 sailors, and thousands of ships of all sizes are easy. I think the possibility of attacking halfway through the ferry will be gone. There is no way, so I have to take a little advantage and be a villain. The soldiers will never get tired of cheating. Let the fleet turn back three to five miles in advance.

In this way, our army is no more than fifteen miles away from the estuary. Li Su and us always stay eight miles away. Even if he goes deep into the lake, he is only seven miles deep. The fan surface with a radius of seven miles is only more than thirty miles square. Each mile square must accumulate dozens of ships and arrays, which is probably possible to take advantage of the chaos.

Moreover, half of Li Su's troops had already sailed out of the estuary, and he would not have time to retreat, and would be congested at the estuary. This forced him to lead a small half of his troops to fight against the entire army. I 90,000 people first ate his 30,000 to 40,000, and then he rushed to the lake and I would defeat them one by one.

The wind is also very beneficial to us now. Li Su's troops drove into the lake with a long snake formation. With such a strong headwind, it would take much more time than expected to turn into a fan formation."

With such concerns, Zhou Yu decisively chose to take a little advantage and did not completely keep his promise. When the fleet evacuated to only fifteen miles from the mouth of the river, he turned around and fought back five miles ahead of the original agreement.

...

The lookout on Li Su's side soon discovered the problem. The information was finally reported to Li Su by Zhou Tai, who followed Li Su in charge of the Central Army fleet.

When Zhou Tai conveyed the bad news, he was a little nervous, regretting that he shouldn't have followed Li Sikong's request yesterday and asked Sikong to personally break out to the front of the central army. So much so that a fleet of only more than 30,000 people has entered Taihu Lake, and Li Su himself has followed him to the lake.

"Sikong! Zhou Yu's fleet was betrayal! He actually came back early! We still have more than 50,000 people, six hundred ships did not enter the lake, and the front army did not complete the formation! Should we let the pioneer General Taishi respond? Or should we try to shrink and retreat temporarily?"

Today, the front army only arranged 20,000 people, led by Taishi Ci. The central army had 50,000, but Li Su was the first to come out in the 10,000 fleet of 50,000 people.

As for the generals of the Central Army, Zhou Tai and Li Su were on the same boat. Li Su also knew that Zhou Tai was the most stable in the navy generals, so he asked him to command the core frigate group where the flagship was located. In addition, Huang Zhong, the central army, was responsible for offensive and pursuit operations, and could follow Taishi Ci and expand the results of the battle.

There were 20,000 people in the rear army, Zhao Yun was the commander, but not only the sailors and warships, but also some cavalry troops. The cavalry patrolled along the two banks of the Zhongjiang River and were responsible for protecting Li Su's retreat.

If there is a good opportunity to pursue the enemy after the collapse of the enemy, Zhao Yun can also go along with water and land - because it is necessary to consider that after Zhou Yu's defeat, some sailors on both wings may abandon their ships and land to land after the ship sinks, or after the ships sink, they expect to withdraw by land to Jianye, Wuxian, Kuaiji Wucheng.

When Zhao Yun's cavalry was going well, they cast nets along the banks of Taihu Lake and could also capture many defeated soldiers.

In contrast, Zhou Yu on the opposite side is also considered to have a decline in talents. The main generals of Taishi Ci, Huang Zhong, Zhou Tai and Zhao Yun on Li Su are Zhou Yu himself, plus Han Dang, Yu Jin and Chen Wu.

The remaining ones, He Qi, Sun Ben, Sun He, Song Qian, and Jia Hua, are just mixed fish. And Sun Yi, Zhang Cheng, and Ling Tong, the second-generation officials in the Sun Quan camp in history, are not yet old to lead troops.

Although Li Su had to face the situation where only more than 30,000 people were to withstand the 90,000 people on the opposite side for a period of time and give the back army time to slowly drive out of the river, Li Su was not panicked at all and directly and firmly ordered:

"Don't worry, everything is implemented as planned. Although we have few vanguards, we will send out the Five-Tooth Battleships and those low-short fighting ships first. Our army is large and the enemy is small. Even if the number of enemy troops is three times that of our time, we will not be able to attack the ship.

What Zhou Yu is counting on is nothing more than the strong wind blowing over the Five-Tooth Battleship, but we were prepared to remove the rod and fix it in the bottom cabin as a ballast. What’s there to be afraid of?”

Zhou Tai seemed so calm when he heard that Li Su was so cowardly, and was not afraid of today's strong winds. Only then did he completely restore his morale and convey his command requirements in an orderly manner.

Li Su's state also gave everyone around him confidence. Everyone chose to believe in science on this issue and no longer believe in the power of heaven.

Shipbuilders in the late Han Dynasty certainly had accumulated some experience in how to ensure the stability of the ship. However, Li Su can say that as long as he was not pointed out by Li Su himself or Zhuge Liang, others would definitely not know how to use physical common sense to calculate the concepts of ships' "center of gravity, floating mind, and stable mind".

In fact, Li Su himself is not very good at calculating, but he is knowledgeable. When he taught Zhuge Liang a few years ago, he knew how to teach Aliang these concepts:

"The equivalent point of action of the overall gravity of an object is the center of gravity. The equivalent point of action of all buoyancy (water pressure) that the ship is subject to when floating on the water surface is the floating center. If the ship tilts left and right, sways and bumps up and down, the trajectory of the floating center is averagely stable."

The center of gravity should be pressed below the waterline as much as possible, so that it can be close to or even overlap with the floating heart and steady heart. Once it is rolled, the buoyancy can also press the center of gravity that deviates from the central axis.

If the center of gravity of the boat is above the water surface, it will be difficult to automatically return to the right and left pressure difference of buoyancy after being slanted. Therefore, traditional tower ships are prone to overturn to the bottom because they are blown by wind and waves by their own weight.

After all, Zhuge Liang followed Li Su to invent the amphibious caravan as early as Liangzhou, so he learned how to accurately calculate the center of gravity of a navigation design object, floating heart, and stabilizing heart, and ensuring that the three hearts overlap as much as possible.

At the beginning, the caravan was small in size and was only more than three meters long, with only a few layers of wooden boards, which was very suitable for Zhuge Liang to practice. The key is that practice is the only criterion for testing the truth. After trying it on the caravan, Zhuge Liang found that the design concept of "three hearts in one" was indeed the most stable, and his confidence increased greatly.

From then on, knowledge and action are united, and designing everything on the water adheres to this principle. If this principle cannot be passed, first of all, the design will be pushed down from the bottom and started over again. This is different from the shipbuilding craftsmen of other princes who built ships just to meet the needs of Party A's laymen. The above part of the water surface looks strong in combat power and strong in defense, which is different from the main tasks.

In the second half of the year Zhuge Liang's "graduation trip", Li Su took him back to Jingnan and to Jiaozhou. Only then did Zhuge Liang come into contact with the design of the Five-Tooth Battleship and even the Dafu Ship sailing in the sea. Zhuge Liang, who had been blessed by physical science, certainly implemented the useful concepts taught by Master Li rigorously and meticulously.

Therefore, Li Su's five-tooth warship, where the five poles and the impact corners are installed, and how the center of gravity is configured, they are all carefully designed. In fact, they are more stable than the five-tooth warships from the Sui Dynasty to the Southern Song Dynasty in history.

Zhou Yu underestimated the stability of the Five-Tooth Warship and guessed it based on empiricism, which would definitely suffer a great loss.

More importantly, before this decisive battle, Li Su removed all the poles on the side of the Five-Tooth Battleship. After the removal, he had not thrown it away. Instead, he could be loaded into the laminated chamber under the cabin and tried to press the chamber as much as possible. If it was difficult to carry, cut it off and press it again.

The position of the ballast is not casually chosen, but is strictly placed near the center of gravity floating position designed and measured before Zhuge Liang's shipbuilding to ensure that the overall center of gravity of the boat after the ballast remains undeviated from the central axis, and is below the waterline, and can be floated back to the right.

More importantly, Li Su has very strict requirements on ballasts, requiring all long iron nails to nail the ballast with wood to the hull. If it is a ballast that cannot be nailed, such as stones, it is necessary to ensure that the space is filled and the gaps are tightly stuffed with straw and other fillings to prevent the ballast from shaking and rolling.

After all, as a person with common sense in physics, Li Su knows very well that no matter how well the center of gravity of the car and ship is designed, it may not be able to hold it when it is used. The biggest change factor here is that the cargo in the car and ship will roll down when it tilts.

Once the heavy cargo on the bay rolls up, the side that tilts lower and rolls to which side will only increase the shift of the center of gravity to the tilted side, which will worsen and worsen, and eventually capsize.

Even people who do not have common sense in physics in later generations can understand the physics principles as long as they read the videos of car accidents on Douyin:

Why do people who don’t understand physics have to fix the steel coils when pulling the cart? Why do people who don’t understand physics complain that it is troublesome to clean the tanker? There are so many isolation baffles in the tank instead of a whole straight tank.

Those who don’t understand will understand it in the next life.

Therefore, it is not surprising that Li Su, a liberal arts student, understands these things. It is not a profound knowledge. Anyone who can understand them by watching Douyin. (A woman’s Douyin probably won’t be able to get physical knowledge... It’s not discrimination. This should be the one who should belong to Zhang Mouming, and the initial push algorithm for men and women is different)

As for those advanced parts, Li Su doesn't have to worry about it. After he inspires Zhuge Liang's concept, Zhuge Liang can become advanced by himself.

Just sit down and discuss the truth, just give it a rough one.

Li Su knew that when designing a boat, he was able to refloat and stabilize the three hearts in one, and he also knew that the ballast should be fixed during use, and the rod should be removed so that the boat would not roll around when it tilted.

What's the big deal if you do these two things and withstand the level 6 or 7 wind that Zhou Yu has been waiting for?

I can only blame Zhou Yu for being damned, and I have not even mastered the physical concepts of the center of gravity and the floating mind.

The Navy is a scientific military. It is natural for the side with science to kill the side without science.
Chapter completed!