"Degui, how is the situation in Luling City?" On the second day, Cao Cao summoned civil and military officials to discuss the military situation at Cao Jun's water stronghold more than a hundred miles away from An County. "Reporting to the Prime Minister, before we arrived here, Sun Quan had strengthened the defense of Luling, and Sun Quan seemed to have deliberately dug out the water channels near Luling. The water level near Luling is now about ten meters deeper than usual. ." Cai Mao bowed his hand and replied to Cao Cao, looking very respectful. "Degui, will the rising water level have any impact on our naval forces?" Cao Cao has been fighting in the north for a long time and does not know the details of the southern naval operations. He can only rely on Cai Mao, the commander-in-chief. "Your Excellency, Prime Minister, the rising water level has no impact on our navy. There are large ships, medium-sized warships, and small sterns in the water. The rise in water level does not affect our military's combat effectiveness." "It does not affect our military's combat effectiveness. "Then why did Sun Quan raise the water level?" Cao Cao was not very satisfied after hearing Cai Mao's words. Sun Quan had been operating in the Chaisang area for more than ten years, and Zhou Yu had trained a powerful navy in Poyang Lake. There must be a plan to raise the level, but Cai Mao said there was no problem, which made Cao Cao very confused. "Prime Minister, I still don't understand Sun Quan's intention, but what is certain now is that if our army wants to attack Luling, we cannot use infantry. We can only use water troops because Luling has been flooded. "Cai Mao raised his hand and reported to Cao Cao. What Sun Quan did was incredible. If Sun Quan wanted to flee westward, he would definitely reinforce the Luling defense line and send an army to defend Luling to buy time for himself to escape westward. However, flooding Luling City does not seem to have anything to do with strengthening the defense line. Did Sun Quan think there were no more infantry? Are you and Lu Dai's navy both vegetarians? "Ding Gong. What do you think?" Seeing that Cai Mao couldn't see through Zhou Yu's plan, Cao Cao turned to ask Lu Dai. "Reporting to the Prime Minister, I believe that the only purpose of Sun Quan's flooding of Luling was to make our infantry lose their combat effectiveness. However, in this way, the supplies in Luling City will definitely be affected. This move of Sun Quan's army is indeed strange. Maybe we Only after Luling is captured can we know Sun Quan's arrangements." Lu Dai and Cai Mao agreed that the result of flooding Luling would be to make Cao Cao's infantry unable to fight, but this approach was not effective in the face of Cao Cao's army with powerful ships. It is unlikely to be effective, but it will weaken Luling's defense. Lu Dai can't figure out what medicine Sun Quan sells in his gourd. "Everyone, what else do you think?" Cao Cao's subordinates are basically all northern generals. They really have no experience in water stations. The only ones who can speak are Lu Dai and Cai Mao who have experience in water operations. After the two spoke, the others basically had nothing new to say. "Bufan. You have fought with Sun Jun here. What do you think?" Cao Cao saw that the atmosphere was a little awkward, so he pulled Lu Rui out. After Lu Rui received the information that Sun Quan flooded Luling, he had been thinking about Sun Quan's purpose. When Zhou Yu's army arrived in Luling, they did not attack him for half a month. This made Lu Rui very strange. If Zhou Yu wanted to stop Lu Rui in Luling, the best chance would be to attack Lu Rui before Lu Rui and Cao Cao joined forces. However, Zhou Yu did nothing, which made Lu Rui feel uneasy. Mizhoulang did not take action. Not a good sign. After listening to the analysis of Cai Mao and Lu Dai, Lu Rui became more certain of his own thoughts. Luling must not have been flooded to prevent Cao Jun from flooding Luling, but had other ulterior motives. It's a pity that the spies couldn't get past Sun Jun's patrol, otherwise they would have known the situation in Luling City. Don¡¯t you know the situation in Luling City? Lu Rui suddenly had an idea and thought of a bold hypothesis. Cao Cao's spies could not come back, and the news from Luling had been cut off for more than half a month. If Sun Quan's army was not in the city, Cao Cao would not have received any information. . Could it be that Sun Quan's main force is no longer in Luling? "Reporting to the Prime Minister, our army has not had any new information about Luling for more than half a month. Now we don't know whether Sun Quan is in the city or not. Rui suspects that this is a trick to deceive the soldiers." Lu Rui raised his hand and reported back to Cao Cao . "Master Hou, Mao also thinks that Sun Quan should have left Luling and set up navy defenses in Luling to stop our army's pursuit." "No, General Cai, you misunderstood me. I meant Sun Quan The main force may not be in Luling City, and Luling City may be just an empty city! "The empty city strategy, Zhou Yu can use the empty city strategy to confuse Cao Cao, there may be only a small number of troops in Luling City. "The Marquis's guess?" Cai Hao touched his chin and recalled the situation of expelling Sun Quan's army near the crocodile mouth. Those naval forces were the navy trained by Zhou Yu, the Poyang Lake navy, I couldn't read it wrong, but of course Zhou Yu's navy only retreated to Luling as soon as it came into contact with Cai Mao's navy. Originally, Cai Mao didn't have any suspicion, because the reinforcements arrived, and Zhou YuIt was reasonable to retreat, but in retrospect, this troop retreated a little too quickly. "Oops, I'm afraid I've fallen into Zhou Yu's trap again!" Cai Mao remembered that Lu Xun only brought 3,000 troops and horses to stop Lu Dai at Poyang Lake. It seemed that Zhou Yu might be repeating his old tricks. "Degui, what do you mean?" Cao Cao saw the change in Cai Mao's expression and asked Cai Mao quickly. "Reporting to the Prime Minister, Ding Gong and I must be cautious when deploying troops, especially the naval forces. Water is not as good as on land. Strong winds and waves may attack the fleet at any time. Therefore, when the navy is marching, it must be equipped with food and grass supplies on board. Because of the food and grass Supplies are always on board, so it often takes a lot of time for the navy to prepare. I am afraid that Zhou Yu took advantage of this and set up an empty city strategy! "Zhou Yu has fought with Cai Mao for many years, and Zhou Yu certainly knows Cai Mao very well, and Cai Mao is cautious by nature. There was no loophole for Zhou Yu to take advantage of. This caution can also be exploited by Zhou Yu. After hearing Cai Mao's words, Cao Cao immediately understood that the naval army often needs more time to prepare than the standing army. Zhou Yu may have taken advantage of this and set up a delaying strategy. "Quickly pass the military order and have lunch at noon. After noon, the army will attack Luling. The truth is, we want to see if Luling is an empty city!" After hearing Cai Mao's words, Cao Cao immediately made a decision. He did not expect Zhou Yu to be like this. Be bold. I want to use the empty city strategy to trick Cao Cao! "No!" "General. It seems that Cao Jun has launched a full-scale attack." Above the Luling Tower. One of Lu Xun's soldiers pointed to the distance and saw Cao Cao's twenty or so ships heading towards Luling City. "Sending troops so soon?" Lu Xun was stunned for a moment. He originally thought that Cai Mao's army had just arrived near Luling and would need to recover for a while before attacking Luling City. He did not expect that the army would be dispatched so soon. "General, have we been discovered? Cao Jun knows that there are only a small number of troops in Luling City?" "It seems that there are some experts among Cao Jun. The governor's plan has been defeated, and there is no point in us staying here. The sergeant was ordered to burn Luling City. Then we took the boat and headed west. According to the water situation, the governor's plan to build the river has been successful. "Lu Xun smiled slightly, Cao Cao, you are one step late. "No!" The soldiers took the order and left, and soon every place in Luling City was set on fire. "Commander, look, Luling City is on fire!" Before Cai Mao's army came into contact with Sun Quan's army, Luling City burst into flames. Looking at the raging fire, Cai Mao knew. He really fell into the trap, Luling City was really an empty city. "Call the whole army to advance at full speed. Order someone to inform the Prime Minister. Luling City is already an empty city. Please make a decision as soon as possible." Cai Hao slapped the bow of the ship hard and told Zhou Yu to run away. The next day, Cao Cao was sitting on a five-story ship in Luling City, anxiously discussing political affairs. Sun Quan's flooding of Luling City far exceeded Cao Jun's imagination. The water depth in the city actually reached an average of five meters, with the deepest point being ten meters, which caught Cao Jun off guard. I definitely can't live in the prefect's mansion, so I can only spend the night on the building and boat. "Degui, what's going on? What's Zhou Yu's plan?" This was the first time Cao Cao entered a water city, a water city that didn't even have a clean footing, and could only spend the night on a building boat. "Your Excellency, Prime Minister, I am guessing that Zhou Yu may have used a plan to build a river. This plan came from Zhao Tuo and was only recorded in sporadic ancient books. Unexpectedly, Zhou Yu actually turned it into reality." "The plan to build a river." A plan?" Everyone was stunned after hearing Cai Mao's new words. What kind of plan is this? Is it to create a river alive? Even people like Lu Rui who have traveled through time have never heard of the river-building strategy. ¡°Your Excellency, Prime Minister, this is a legend that Mao heard when he was studying in his childhood¡± It turns out that there are heavy rains in the Lingnan area in spring and summer, and when the rivers overflow, it becomes a flood. When Qin Shihuang was on his southern expedition, he built the Ling Canal in Guilin County to transport troops and horses to Jiaozhou. This is something everyone knows. Later, the Qin Dynasty rebelled, and Zhao Tuo established himself as king in Lingnan. Of course, the Qin Dynasty refused to accept it and sent a large army south to attack him. Zhao Tuo defended Guilin County and blocked the Qin Dynasty's army. But the Qin Dynasty's army numbered hundreds of thousands, and some clever generals came up with a way to start from Luling, bypass the Lingnan mountains, and raid the rear of Jiaozhou, which is now Cangwu. The Lingnan mountains are the northern barrier of Jiaozhou, and the only exit is Guilin County. The generals of the Qin Dynasty came up with this method and tried to send 10,000 troops. In the end, more than a thousand people rushed out of the Lingnan mountains and attacked Cangwu. However, more than a thousand people were quickly defeated by Zhao Tuo. After Zhao Tuo discovered this loophole, he came up with a plan to build a river to stop the northern army. From Luling to Wuman River are the Jingzhou mountains, which correspond to the Lingnan mountains.In the middle of this huge mountain range is a canyon plain that is hundreds of miles long. Zhao Tuo dug out all the rivers in the Lingnan mountains, allowing the water to flood the canyons and plains. Coupled with the heavy rain season in the south, a river channel was formed. This was a river-building plan. Starting from spring and continuing until autumn, the artificial river building will subside due to lack of rain, but as long as winter is over, Zhao Tuo can use the river building strategy again. Since there is only one dry season, the northern army can no longer enter the Lingnan mountains through Luling and attack Jiaozhou. Because of this, at the end of the river-building plan, Guilin County naturally became the only way to enter Jiaozhou. "Zhao Tuo is really powerful. He actually knows how to use the right time and place to stop the northern army!" Lu Rui couldn't help but admire Zhao Tuo. History only records that Zhao Tuo cut off the northern route and dominated Jiaozhou for several generations, but it did not accurately explain what happened. How to cut off the road to the north? It seems that this river-building plan is really powerful. "General Cai Mao means that Zhao Tuo used the terrain to form a prototype of a river, and then successfully created a river by filling it with water?" After listening to Cai Mao's words, most of the people were still in the fog, and Cao Chong made He made a metaphor and explained it to everyone. "Well, Zhao Tuo is indeed the King of Lingnan. He actually came up with such a strategy to stop the northern army. General Cai, since Zhou Yu has successfully built the river, is there any other mystery about this river?" As soon as Cao Chong explained, Cao Cao understood. , but Cao Cao didn't know what was behind this river-building plan. "Master Prime Minister, the river created by the river-building plan will change differently depending on the season. For example, in early spring, there is less rain. If you just rely on diversion to build a river, the depth of the river will inevitably be insufficient, and only small larvae can survive. By the way, in summer, the river water surges, and with the heavy rains, it is enough for large ships to pass. In autumn, when it is stable, the river water will gradually subside, and in winter, there will be no so-called big river. " "It's just that. , walking on the river, you will encounter strange strong winds from time to time. The general has only heard of this strategy, but has never seen it. Please think twice." Cai Mao saw Cao Cao asking him, knowing that he was going to pursue. I have made a decision, but I have never really tried the power of building a river. I don¡¯t know what mysteries will be about this artificial river. "General Cai, I just want to ask you, if we pursue Sun Quan now, can our army pursue Sun Quan?" Cao Cao glanced at Cai Mao, without any unnecessary nonsense, he just asked if he could pursue Sun Quan. "Don't worry, Prime Minister, it's only the beginning of spring. Although our infantry can't wade through the water, the river has not yet reached its true course. Our army can send out swans to pursue him first, followed by the building ships. We will definitely be able to pursue Sun Quan in the summer." Cai Mao. He bowed his hands and reported back to Cao Cao. Advantages are relative, and disadvantages come with them. The current river is not wide and cannot be used by large numbers of boats. Zhou Yu and his troops must be at most fifty miles away from Luling. With this gap, Cai Mao is confident of catching up with Zhou Yu. As long as the water rises, the real river building will be successful. , Cai Mao's army will definitely be able to pursue Zhou Yu and Sun Quan. "Okay, all the civil and military personnel listened to the order and took a short rest in Luling. They ordered Gongda to prepare supplies and baggage in Chaisang and transport them to Luling as soon as possible. As soon as our army's supplies arrive, they will attack to pursue Sun Quan. This time we must Destroy Sun Quan in Jiaozhou!" Cao Cao drew his sword and made the decision to pursue Sun Quan. (To be continued) PS: Thank you for your great support. It will be updated from Monday to Friday, and Rabbit will prepare new books on weekends. After Yaocai, it is a new history book. Please continue to support it.