I don't know if there is a rock mass under the hills on both sides of the Shuangfeng mouth, if not, the civil dam body will inevitably begin to loosen after being soaked in water for a few days, and the giant wooden pit groove that fixes the foundation of the dam body may not wait for the Xuanwei army to move, and it will soon be completely loosened and disappear, and the giant wood will slide, and the dam will collapse soon.

Yang Congyi stood on a hill more than ten zhang away, looking at the large lake upstream, this dam body can no longer be reinforced, what the Xuanwei army can do is only speed up the dam collapse, and can not delay, maybe the dam will be gone before noon, it is best that the enemy has already set off to rush to Nasuo Town, otherwise this battle, it is difficult to win with only 2,000 of them.

After standing for a while, he returned to the camp, took out his map, and carefully studied the terrain of the area, and if the water could not destroy most of the enemy, he had to make preparations for the future.

After the flood, the enemy either advances or retreats, if it advances, it has to wait for the water to completely recede, during this period you can set up an ambush, launch an attack on the enemy camp, lure a small group of enemies to pursue, and then eat it in one bite, so that you can effectively kill and injure the enemy, but this plan can not last long, once or twice, the number of times, it will not work, Xuanwei army food and grass is limited, and the enemy has taken the rich Dongxing Town, if it is delayed for a long time, they will definitely be dragged down by the enemy, and finally have to retreat to Anyuan County, back to Qinzhou City.

Or when the road to the south of the flood is damaged, and the surrounding area of Nasuo Town is in the ocean, and it is difficult for the enemy to advance eastward, send the Xuanwei army to detour south, recapture Dongxing Town, replenish the food and grass of the Xuanwei army, and cut off their logistical supply, so that they will inevitably return to the division to recapture Dongxing, and they can set up an ambush on the way back to Dongxing to continue to kill and wound the enemy, so that although the battle line is long, it is a way to repel the enemy.

Yang Congyi carefully compared the map, checked the terrain, and began to think of a strategy to retreat from the enemy.

I don't know how long later, the sergeant on duty at the side of the dam came to report that the water had overflowed the top of the dam and flowed outside the dam.

He heard the news, put away the map, and went out of the camp to the dam.

I saw that the earth and stone hills piled up outside the dam were under the impact of the water flow, and the loess sand and gravel continued to flow into the downstream river with the flowing water, forming a turbid water flow, and the big river water slowly rose.

I hope that the dam will last for a day and a half, until the enemy has gathered on the bank of the river on the west side of the town of Nasau, but as far as the present situation is concerned, the dam will not last long, and it will be full of wood, mud, sand and gravel, and the dam will collapse within a few hours after the water is soaked and overflowed.

One mile west of Nassau Town.

Thousands of Li Yue's enemy troops were marching, and the general had given an order early this morning to enter the town of Nasuo to rest and recuperate before noon.

These days can toss them so badly, they will be harassed almost every day, they dare not sleep at night, they dare not march boldly during the day, they are always afraid that they will be ambushed, and the whole army must wait for the news from the outpost spies who have gone five miles forward to send back the news before they dare to continue to advance. He was supposed to arrive at Nasuo a few days earlier, but he was harassed first, and then he encountered a heavy rain, the river swelled, and the roads were muddy, making it difficult to march.

I got the news early this morning, three miles away is Nasuo Town, the town is empty, and there were traces of the army stationed, after careful investigation, it was found that it was left by their own people, it seems that the North Route Army has taken the first step, from Nasuo Town to the east.

Half an hour later, the marching Li Yue army stopped.

"Go and see what's going on with the front army, why did you stop?" The commander of the Li Yue army rode on his horse and gave orders to the guards beside him.

The guards received the order, quickly stepped on the muddy ground and ran towards the front army.

The commander of Li Yuejun rode on a horse, looked around, and found that the terrain here, as reported by the spies, to the north and east, the terrain was flat and endless, and although it was not flat to the south, it was also a mound that was not more than a few zhang high. This kind of terrain is not suitable for ambushes, and the cunning Great Song people will not come here to die.

Wait for the army to rest well in the town in front of it, wave the army to the east, take Anyuan County in one breath, and then enter Qinzhou, you can take the western part of Qinzhou within half a month, and then wait for the opportunity to attack Qinzhou City, once Qinzhou is taken, you can go north to harass Yongzhou, and create opportunities for the army to go east to Zuozhou and Yongzhou, if everything goes well, the army will definitely be able to include most of the prefectures and counties in Guangnan into Li Yue's bag this time, and when he is rewarded for his merits, he will definitely rise again by virtue of his merits in winning Qinzhou alone, and it will be easy to command 10,000 people.

When he was still immersed in the fantasy of taking Qinzhou and receiving a reward, the guards came to report: "General, the front army is blocked by the big river, and it is impossible to cross the river without boats, and they are trying to find a way to search for boats. ”

"What? River? Didn't the spies come to report early this morning, the river in front of it is only two feet deep, can it be crossed? Did the former army go the wrong way? The commander was furious.

The guard cautiously replied: "General, you are not on the wrong path, on the other side of the river is Nasuo, and you can see that there are many houses over there." ”

"Then how can the river rise?" The commander asked angrily.

Konoe didn't know how to answer, how could he possibly know why.

As soon as the words came out, the commander knew that he had asked the wrong person, and after thinking about it, he urged him to dismount and ordered: "Go, come forward and take a look." ”

A team of guards behind him immediately stepped forward and said: "Let me go, the general is here!" ”

Li Yuejun, who was standing in the middle of the road and waiting, heard the shouting, and avoided them to the left and right, and immediately commanded the horse wherever he went, and moved out of the way of the eight-foot-wide road.

After a short time, the commander came to the river, only to see the muddy water of the river, flowing slowly, covering the surface of the river twenty or thirty zhang wide.

"General, the spies' news is wrong, in the morning they said that this river is not deep or wide, and the river can be crossed, but the river in front of me is not said to be watery, even if there are boats, they may not be able to cross the river, I really don't know how they crossed the river, it is possible that they have a leg long." The vanguard officer of the former army stepped forward to meet the commander in chief and criticized the outpost spies.

"Did you go into the water?" The commander asked, looking across the river.

"It went down, the water was very deep, and the soldiers who went into the water sank directly, and if they were not prepared, they would have drowned in the river. Measured with a long pole, the river was at least a zhang deep, and the middle of the river was even deeper. The pioneer officer was very annoyed.

"Did you go up and down the river? Is there a place where you can cross the river? The commander asked again, and the spies would not tell a lie, perhaps they had chosen the wrong place to cross the river.

"It has been investigated, and within a mile up and down, the river surface is more than 20 zhang wide, and the narrowest place is also dozens of zhang, and the water is not shallow." Pioneer official road.

"What do you think could be causing the river to swell?" The commander looked at the yellow river.

The pioneer officer thought for a moment and whispered, "Could it be that the upper reaches of the river have started to rain heavily again?" ”

"It should be, otherwise how to explain the murky waters." The commander looked up to the north, and saw that there was a high mountain in the distance, although it was not majestic, but it was continuous, and this river must have originated from the northern mountains.

"The river is so wide and the water is so deep, what do we do next?" The Pioneer Officer asked.

"Command the whole army to camp on the spot and wait for the river to recede." The commander glanced at the town opposite, and urged his horse to a distance of half a mile from the riverbank.

Then he instructed the guards: "Camp here." ”

Li Yue's army quickly set up camp on the west bank of the river and waited for the river to recede.

Yang Congyi went out of camp again and came to the dam, and after more than an hour of water impact, the mound of soil outside the dam disappeared into a thick layer, and several layers of soil slipped into the water inside the dam.

The dam should be about to burst and won't last long.

Towards noon, spies lurking around the town of Nassau brought back the good news that the enemy had camped west of Nassau.

Yang Congyi's heart that had been hanging finally fell, and he pondered the follow-up plan for retreating from the enemy for an hour or two, but it seemed that it was useless, so it was better.

The water level in the lower reaches of the river should have been restored to before the interception at this time, and it was categorically difficult to cross the river without boats, and Li Yue's enemy army should be destroyed.

"Order Yao Chang, prepare to destroy the dam." After Yang Congyi gave the order, he sat on a hill more than ten zhang away from the dam, and he wanted to see with his own eyes how magnificent the water was when it went south.

One hour, two hours, three hours, the dam that had been washed away by the water and most of the mound had not yet collapsed, and it seemed that the strength of the dam was somewhat underestimated.

The sky is getting dark, it is already evening, and the dam burst at night is the most ideal time to destroy the enemy, Yang Congyi decided to destroy the dam.

Dozens of Xuanwei soldiers were immediately recruited, they tied ropes around their waists, held shovels in their hands, and slowly descended from the hill to the side of the dam, and the east and west of the dam were started at the same time, and a small ditch was shoveled out where the dam and the hill met, and they were shoveled out a small ditch that was more than three feet wide and more than three feet deep.

When the outer ditch was shoveled, everyone climbed up the hill, Yang Congyi said "waterproof", and the Xuanwei army, who was guarding the inside of the dam and close to the side of the lake, quickly shoveled through the last section of the ditch.

The lake instantly filled the two-foot-wide ditch and flowed out of the dam and rushed to the mound of sealed earth outside the dam.

The water flow of the small ditch is concentrated, and the mound of earth is quickly washed out of a mud ditch, rolling down, and flowing into the large river below.

Before long, the mound began to burst at a speed visible to the eye, and large expanses of earth rolled into the river.

When it was getting dark, there was only a loud bang, and the mound of earth that reinforced the dam on the outside finally collapsed and slid into the river, blocking the mouth of the river.

It won't be long before the dam will burst, and everyone wants to see what a spectacular sight it is to see the five-zhang high wall of water rushing straight down after the dam bursts, but the sky has completely darkened, and they can't see it unless the dam can hold out until tomorrow.

Inevitably, the whole army of Xuanwei Army retreated to the camp, and no one was allowed to walk down the hill.

That night, no one in the Xuanwei army camp was resting, and they were all waiting for the moment when the dam would burst.

At night, I don't know how long I waited, when I was tired, I only heard a loud "boom", and everyone was in good spirits.

"The dam has collapsed! The dam has collapsed! The pitch-black camp erupted in bursts of excited shouts.

How long have they waited for this, the dam has burst, which means that the enemy downstream will be completely destroyed, and at this moment, they can fully celebrate.

The Xuanwei army shouted and shouted in the dark night, reveling wantonly.

After Yang Congyi heard the loud noise, he completely relieved his heart, fell asleep in the noise.