Whenever the water in the dam collapses, the flow rate goes downstream, although the water is distributed relatively evenly, and the entire battlefield will be flooded. The location where the dam collapse just broke is often only the few points in the dam collapse are particularly surging, but other places without water can be completely avoided.

Guan Yu did it intentionally and would command his troops to avoid the breaking point. Zhang He Gaolan did not know which point in the upstream broke point. With this information difference, Guan Yu's troops chose a higher river bank along the south bank of Qinshui to retreat slowly, but Zhang He Gaolan could not stop it.

Even the troops rushing to Guan Yu were not established, and the reinforcements of the rear army could not quickly gather together. In desperation, they had to surround Guan Yu in a loose semicircular formation from a distance, and could not go forward to fight and annihilate it.

Not long after, the defenders of Yewang City saw the fire in the west and slightly evaluated the water level of the rushing to the city. Zhuge Liang immediately ordered to open the north city gate of Linhe and send all the Guan Yu army's boats out to pick them up. Only the necessary sailors for rowing on the boat were left, and no combat soldiers were left, so that after receiving Guan Yu, they could as much cavalry as possible to return to the city.

Although this step seems easy, it is actually the most difficult of the many steps arranged by Zhuge Liang tonight. Because the water rises and the flow speed is accelerated. These ships that require a certain amount of sail power cannot withstand the countercurrent water speed and cannot move upstream in reverse.

The boaters walking on the boat were all the lunches yesterday, and they were rewarded for both dinners, and had a full meal of meat and drink wine. They all chose strong people with extraordinary arm strength to row against the current.

Another quarter of an hour later, Guan Yu fought and retreated downstream. Zhuge Liang sent a boat to him and was able to take him back. The two sides walked towards each other, and only then did they receive Guan Yu's troops back to the city through the Qinshui Road.

With a slew of people, only 2,000 light cavalry came back. After all, they fought with Tuo Yi's troops when they first kicked the camp, and were intercepted and killed by Zhang He and Gao Lan twice.

In the end, it is inevitable that one will marching and retreating under the conditions of water-stacked roads, and drowning and washing away two or three hundred people. In total, one thousand elite cavalry must not die.

There were also three or four hundred people in the Iron Cavalry side. However, the total loss of less than 1,55 cavalrymen was exchanged for 20,000 people who defeated Kuo Yi. Moreover, the flooding of the flood also caused certain damage to Zhang He Gaolan Camp. This exchange ratio was definitely very cost-effective.

...

Yuan Shao himself was not in the besieged camp west of Yewang City. His camp had to be slightly behind, so it was only when it was dawn on the second day of July that he learned about the setbacks ahead.

Yuan Shao was very angry. His first reaction was that he felt it was impossible. He sternly asked to investigate the situation of the war and wanted to punish Qu Yi, thinking that Qu Yi had leaked the secret or that he had colluded with Guan Yu to deliberately let the water go.

After hearing the news, Ju Su, despite his lack of trust, urgently asked for a meeting and advised him, finally stopped Yuan Shao.

At that time, Yuan Shao initially asked Ju Su: "If it weren't for Kuo Yi's leak, how could Guan Yu know that our army was building a dam upstream? He made a surprise attack? If my friend asked me to act in a secret matter, even Zhang He and Gao Lan would not know the final word! Who else could leak the secret?"

Ju Su sincerely analyzed: "Lord, since you have decided to do this kind of thing, you should be careful. How can you keep it confidential? Qinshui was blocked and the water level dropped. If there are talents in the city who are good at astronomy and geography, it is possible to judge the abnormality from the observation of the water level... Alas, this is a loss of attention."

Seeing that Ju Su was right, Yuan Shao couldn't help but feel uneasy, and turned to another person to vent his anger and asked Xun Chen, who taught him the strategy of "Broken Qinshui and let Guan Yu break through the wild royal city."

"Xun Youruo! Your Xun family is so embarrassed to claim that the Xun family's three Ruo is very smart. Look at the bad idea you came up with! Zhuge Liang couldn't tell that Qinshui was blocked and the water level dropped. Our army had just made some progress in siege, so he was so relaxed and slow!

When you take the strategy of changing the way to water, have you not thought clearly about how much damage it would cause to our own troops if it was obstructed and destroyed by the enemy in the middle? "

Xun Chen had nothing to say, so he could only put down his self-esteem and kowtow to admit his mistakes. After all, the failure of the plan also killed many soldiers. He could only bite the bullet and confirm the losses first:

"This is all the fault of subordinates. I am willing to be punished, but the lack of strict governance of the army is not enough. Now let's take a look at the loss first."

Yuan Shao was so anxious that he had someone report the losses. Finally, he learned that it was only that Tuo Yi's troops had completely blown up the battalion, and only 3,000 central troops were left to enter the battalion without moving. The other troops fled in scattered and were not sure about the casualties and injuries. They were trying to gather as much as possible after dawn, and they didn't know how many could be recalled.

Zhang He and Gaolan were still able to accept direct casualties. The total number was no more than 5,000 people, but the camp was more or less soaked in water. Zhang He's camp in the west of the city was the first to be hit, and Gaolan's camp in the south of the city was slightly better.

Many of the rations that accompany the army in the camp were soaked, and the loss of food that was equivalent to that of the army for several days was inevitable. The rest of the equipment tents were also lost. The key is that after the road was completely soaked in cement, the logistics of continuing to replenish supply and advance became difficult.

In fact, there are more serious consequences. Yuan Shao's army has not noticed it yet. That is, during the hot summer, the two sides of Yewang and the battlefields around Wen County had already died in total, and there were twice as many wounded people.

These wounded soldiers have concentrated corpses, but they are still in the summer, so plagues are prone to break out. If they are flooded, the dead bodies buried shallowly in the grass before were mostly soaked in river water, so they will definitely not be optimistic in the long run.

Yuan Shao had no choice but to slowly recover one by one and then reorganize the attack.

...

At the same time, after Guan Yu withdrew from the Wild King, he only took a short rest for two hours, and then got up again and inspected the defense line.

Zhuge Liang had already heard about the situation brought back by the soldiers at night attacks, and knew that his previous judgment on Yuan Jun's motivation for blocking the river was actually a bit deviant: he didn't want to flood the city, but wanted the river to divert the route.

It was me who ignited this hidden danger in advance, releasing the diverted water storage in advance, which led to a smaller flooding as a replacement.

With Zhuge Liang's IQ, of course he was a little puzzled at the beginning, but he quickly figured out the other party's real motives.

"This is someone who is suggesting that Yuan Shao cut off the Yewang Guardian's retreat from the water when the city cannot be defended anymore! We must connect our more than 20,000 people, including the Taiwei and other important generals, and annihilate and kill the Yewang City!

That's really vicious, and he is willing to spend a lot of money! I don't know how much farmland will be submerged and how many innocent people in Hanoi will be killed. And is it so easy to control the diverting of rivers?

Just based on the math wastes on Yuan Shao, I guess he doesn’t even have the ability to survey and draw high-quality drawings. Once the river channel is out of control, he will rush into the Yellow River from a pre-planned position, and he may not have drowned at least several townships.

Now it is still hot and hot, and the rotten water spreads after the corpse is soaked and eroded, which is even more likely to cause plague. These Yuan army advisers are really ignorant and fearless."

Zhuge Liang secretly hated those wastes to mess with the goods. After all, those pure civil servants who do not have knowledge of science and engineering have too little understanding of the principle of the plague.

This is not Zhuge Liang's rise, but the truth. Looking at the original historical story of Cao Zhi's writing about the epidemic after the 22nd year of Jian'an, we know that the top intellectuals and literati of that era understand the cause of the plague at that superficial level.

Note: The plague in the 22nd year of Jian'an was the battle of Hefei in Cao Cao's southern expedition to Sun Quan. It was a battle of death and injury for too long. The source of infection was not controlled. Plague spread in both armies' barracks. Then Cao Cao had to withdraw his troops.

After withdrawing the troops, the plague was brought back to Yecheng, which led to the death of the seven sons of Jian'an, except for Kong Rong, who died prematurely, the remaining people who were still alive were destroyed during the plague this year. Cao Zhi wrote that the epidemic was commemorated because of the death of the seven sons of Jian'an.

Zhuge Liang thought of the trouble caused by Yuan Shao's counselors who had a random idea, so he had to consider the plan of "withdrawing out of the wild king early and giving up the strategic transfer of the city" carefully in advance.

Originally, he also hoped to use the Yewang City to consume at least another ten or eight days, and to let Yuan Shao bleed more. He would no longer kill 20,000 people in battle, and severely attack the vigor and morale of Yuan Shao's army when he first set out on the war. Guan Yu would not easily retreat.

Now, I have to worry that Yuan Shao will continue to work hard and continue to dig the river in depth at any cost to complete the diversion. Guan Yu's damage last night was just dug up the embankment, but the river dug by Tuo Yi was not filled back. The project was too large and it was too late, which would really not be able to withdraw at that time. At the same time, we have to be careful of too many casualties and injuries and the plague spread after flooding.

Zhuge Liang decisively told Guan Yu about his judgment and made him make a quick decision: "...Taiwei, our army is now facing these new risks and troubles. I advise you to make plans early and strive to prepare the waterway map of the troops within three days and withdraw from the wild king.

Use the materials that should be used as much as possible, so we don’t need to save money. We may not be able to stay as planned for so long. Yuan Shao is likely to continue digging the water diversion channel between Qinshui and Jishui. I evaluated their project volume. If we were given ten or eight days, we would definitely not be able to leave."
Chapter completed!