Early the next morning, it turned into rain and went down into the mountains and forests.

He did not go after Bamudan, nor did he gather the rout.

The natives of South Vietnam and Zhang Yiping searched for a long time, but they did not search the defeated Han army, and he naturally couldn't find it.

Turning into rain just pressed the map the emperor gave him in his hand, and found an extremely hidden mountain.

With a sharp swing of the big knife in his hand, he almost cut down the nearby weeds and broken trees, and only then did he see some clues.

"Look at the map drawn, there should be a hole here?"

It's hard to figure it out, but there's nothing else suspicious nearby.

So, I had to face the ground, hold a knife, and scrape and stab like a fool.

After poking for a while, he felt that something was wrong.

The knife touched something.

He simply fell on his stomach and picked up the mud nearby with his hands.

After pulling for a while, he pulled out a wooden plank.

Turning into rain, dividing the plank by two, the plank was removed, and under the plank, there was another layer of mud.

He stripped the mud again, and saw a plank of wood again.

It wasn't until the second plank was removed that a hole was revealed.

"This is it."

Turning into rain let out a long breath, exhausting the person.

A small opening in the tunnel, unexpectedly, has made so many layers of closure.

He went straight down to the hole, and the tunnel seemed to be very deep, very deep on the outside, and also deep on the inside.

Even if there is no wooden planks or dirt to block it, the fruit is exposed, but it is simply hidden under the control of trees and weeds, and it is not easy to be found.

After walking for a while, he felt that he had come to an end, because he touched an earthen wall.

In the darkness, he reached out and touched the top of his head.

"Plank it, yes, this is it."

Hua Chengyu continued to hold the knife, reaching for the junction between the plank and the earthen wall.

The two are not closely connected, and the planks can be easily removed by digging up a layer of dirt around them.

Then, when it turns into rain, the planks are dug out one by one.

With a slight click, a large amount of earth fell, and then the earthen wall fell.

After waiting for a while, the soil no longer fell, turned into rain and patted the dirt on his body, stepped on the plank, and then officially entered the tunnel.

"Who?!"

At the head, there was a soldier of the Han army, who held a sword against him.

"Imperial guards, turn into rain."

The soldier immediately relaxed his vigilance, turned into rain in the army, and was still somewhat famous.

The army has always been by the emperor's side, and the senior generals who don't know that Changshan has authentic should be the only one who turns into rain.

Moreover, this exit is very blocked, and it is impossible for the soldiers of the Cochin country to find it.

According to the emperor's instructions, this place was also used as a contact point.

"It should be that there is news from Your Majesty's side, and we can probably start fighting."

The guard thought so, but he didn't just let it rain.

"Where's the token?"

"Here."

turned into rain and handed out an object, and the soldier touched a few handfuls and felt that there was no problem:

"Let's go in, Lord Chen and General Li are both in the biggest tunnel."

"You should have a map, right?"

"Follow the map and you'll find it."

"Yes"

Turned into rain and entered the tunnel, with a map and without a map, the difference doesn't seem to be particularly big.

After all, the tunnels on this map, with seven bends and eight turns, are connected everywhere and have their own uses, so it is really not easy to walk.

After walking for a while, he got lost.

It was under the guidance of the soldiers of the Han Army who were hidden earlier that I met Chen Fujia and Li Jingji, who had been in the tunnel all night.

Both of them had little energy, and their breathing was a little dull.

But when I saw that it was raining, I suddenly had joy on my face.

Chen Fujia is even worse, he is dignified Yingchuan Chen, a famous family in the world, and he has to learn to be like a ground mouse, and he is reluctant in the tunnel, so he said eagerly:

"Your Majesty has taken the Changshan Holy Land??!"

"Got it."

Turning into rain for a while, he was confused in the clouds, he left in a hurry, and the emperor didn't explain anything to him.

But what's going on in this tunnel?

After the rout, why were the Han troops scattered and fleeing in all directions in the tunnels?

And when you see him coming, you know that you have taken the Changshan Holy Land?

turned into rain, and suddenly there was a feeling in his heart that he had been abandoned by the world.

Chen Fujia knew, Li Jingji knew, Dian Chu probably also knew, and the soldiers in this tunnel all knew why.

But he didn't know??!

"It's good to take it, take the Holy Land of Chang Mountain, it means that the most difficult South Vietnamese natives have been solved, it seems that now is the time for us to play."

Chen Fujia moved his muscles and bones, but he still couldn't stand upright.

In the tunnel, it is not wide after all.

"Master Chen, tell me, what the hell is going on??"

Seeing this, Chengyu was even more impatient and couldn't wait to ask.

Chen Fujia made a blank look and said:

"Authentic, Your Majesty is good at cave attack, everyone knows it, aren't you one of the eight hundred imperial guards who attacked Zhang Huaiyang at night at that time?"

"Please also ask Lord Chen to make it clear, and I can cooperate."

It's still very urgent to turn into rain.

Of course, he also knew that this was a tunnel, but when was the tunnel dug for stepping horses?

How did the men get in on horseback?

Could it be that even yesterday afternoon's big defeat was fake?

He's the only one in the dark?

This is clearly catching an honest man and deceiving him to death!

Seeing that it turned into rain like this, Chen Fujia was secretly happy in his heart.

I only felt that the gloomy and damp atmosphere in the tunnel was empty, and the whole person was a lot more comfortable.

"In order to chase the natives of South Vietnam, His Majesty deliberately led the army deep into the mountains and forests."

"But those South Vietnamese natives have lived in the Long Mountains for generations, and they have crossed the mountains and mountains as if they were walking on flat land."

"Even though our army is well-armoured, we have specially recruited some South Vietnamese soldiers to supplement our mountain combat capabilities."

"Of course, you can take advantage of some advantages, but how many advantages can you have?"

"Your Majesty is majestic and strategic, how can you be so unwise to fight with the natives of South Vietnam in the mountains and forests?"

"Even so, with a certain wisdom, will he not be able to see the danger of going deep into the mountains and forests, and advise him?!"

Chen Fujia looked proud, and he didn't care about him three-seven-twenty-one, and first put gold on his face.

Then he took a deep breath, paused for a moment, and continued:

"When you exchanged gold and silver for the natives of South Vietnam in the market, His Majesty had already sent people to start digging tunnels."

"Do the math, it's been a month of digging."

"In the land of Jiaozhi, there is mostly red soil and clay, and the same is true of Changshan, and in recent days, it has been cloudy and rainy."

"The soil is soft and wet, making it more suitable for digging tunnels."

Hua Chengyu nodded, and suddenly realized.

This is true, even on the ground on the top of Changshan Mountain, the emperor can easily stand on the ground with a chessboard spear, of course, suitable for digging.

But he was even more puzzled:

"The land in Cochin is certainly wet and soft, but it has been rainy in recent days, especially yesterday, and it was a torrential downpour."

"Even if Changshan does not turn into a Wang Yang Ze country, it is very unfavorable to the safety of the tunnel, why can you hide in the tunnel??"

He is well aware of the drawbacks of the tunnel, and it is outrageous if the tunnel is not flooded.

At the beginning, Zhang Huaiyang sent people to tell the guards of various counties in Qiongzhou to attack by water and fire to solve the tunnel.

It's just that before the guards were prepared, the city had already been deceived by the emperor and was not used.

But both methods, without a doubt, are very good for digging tunnels.

And now on a rainy day, although you can't set fire, but under the storm, won't the tunnel be flooded?

Seeing that Hua Chengyu asked again and again, Chen Fujia bowed his head with a satisfied expression.

Turning into rain is much more fun than Dian Chu and Li Jingji.

One is to hold back for a day and not be able to let out a few farts, and the other is to just follow the steps and read according to the script.

It's better to turn into rain, he will draw inferences, 100,000 whys, which can satisfy his desire to show.

Chen Fujia saw that there was a compliment, so he patiently explained:

"It's natural, and heavy rains have a big impact on the tunnels."

"But in order to fight the enemy and protect themselves, the soldiers can only overcome difficulties and dig deeper, stronger, more responsible and more comprehensive tunnels."

"As the so-called water flows to a lower place, then it is excavated in the mountain, and even combined with some hidden caves, the isolated caves are gradually developed into criss-crossing tunnels."

"Some places that are prone to rainwater are also deliberately covered up and sealed with wooden boards, broad leaves, soil, etc."

"At the same time, the soldiers also dug special passages for drainage."

"These optimized tunnels have greatly improved the concealment effect compared to the tunnels you used to attack the enemy camp at night before."

"Don't say you're not afraid of heavy rain, even if it's a water attack, a fire attack, or a smoke attack, it's all coming, and it's all in vain."

"You set fire and smoke here, and that side will either be sealed, or you will directly drill into another tunnel and slip away."

Chen Fujia saw that it was too troublesome, and in this tunnel, breathing was not very smooth.

He simply took the tunnel structure diagram drawn by the emperor when he taught the soldiers how to dig the tunnel, and gave it to Chengyu.

Hua Chengyu only glanced at it a few times, then took a deep breath, trying to ease his emotions.

As far as the tunnels indicated on the drawings are concerned, the excavation depth is generally between three and four feet, the width is about two feet, and the height is three to five feet.

At the top of the tunnel, round logs, hard clay, and a small amount of copper and wood are used to make a protective roof with a thickness of about three feet.

The top cover can act as a support.

Smaller tunnels with only a supporting roof.

And some large-scale tunnels, such as those specially designed to allow Dianchu to drill into, are set up with additional support columns in addition to the top cover.

In terms of the shape of the tunnel, most of them are in the shape of "B" and are tilted.

At first glance, it is also designed to prevent heavy rainfall, so that water seepage can be discharged into the reservoir or drainage tunnel.

The water reservoir around the corner can be used as a water barrier to prevent enemy invasion and as a well.

And judging from this number, I am afraid that except for a few, the core generals of the Han army who have mastered the tunnel map.

Even ordinary Han soldiers and soldiers can't figure out how many tunnels they have dug in the past month!

Even though I was horrified in my heart, I still had too many puzzles when I turned into rain:

"Lord Chen, we have to dig so many tunnels, and we have to conceal them, as well as all kinds of meticulous treatments, where do the materials come from?"

As soon as he asked, he felt a little stupid.

There are many dense forests in the country of Jiaozhi, and the Han army is in the mountains and forests.

Unlike when they used to dig tunnels in Qiongzhou City, what kind of wood and bamboo materials were directly taken from the local materials.

"Looks like you know."

"In this long mountain, there are trees all over the place, both tall trees and bamboos for building materials, and low shrubs and vines for cover."

Chen Fujia lowered his voice, with an unfathomable appearance, and said:

"But that's not all!"

"You are in the bazaar, exchanging silver money with the natives of South Vietnam, and they don't have to take wood, bamboo chips and other things to exchange, right?"

Hua Chengyu was stunned for a moment, and then sighed again and again.

That's right, the emperor ordered a mutual market with the natives of South Vietnam, and the prices were very low, and there was almost no profit.

What was acquired was not only deerskin, camphor, and herbs, but also things that were useful to the Han army, or resold and profitable.

Even the wood that can be found everywhere is discounted and charged a lot.

It can even be said that these easily obtainable items are the most traded these days.

After all, even if you don't have any valuable deer skins and herbs at home, you can still chop some wood.

At that time, Hua Chengyu thought that the emperor was trying to win the favor of the natives of Jiaozhi, and he did everything he could.

In those South Vietnamese natives who were unaware of their ins and were coerced away by Bamudan, when they resisted the Han army, he even scolded several white-eyed wolves for this.

In fact, the emperor has been calculating people since he was trading with the natives of South Vietnam.

This is only the Han army digging tunnels!

Even tens of thousands of South Vietnamese natives are involved!

It can even be called a "Changshan National Project"!

"However, through the mutual market with the indigenous people of South Vietnam, the source of building materials is not stable."

"What's more important is the division of labor and cooperation proposed by His Majesty."

"Assign the task of each soldier precisely, someone is responsible for digging the soil, someone is responsible for lifting the soil, and someone is responsible for transporting the soil and dumping it."

"Each song, each battalion, each contract a section."

"For shallower tunnels, the excavation method is to dig a 10-foot shaft every 100 feet or so."

"Then from inside the shaft, both ends are excavated at the same time towards the middle until they converge."

"That way, it's much easier."

turned into rain and couldn't help it, and asked:

"Wouldn't such a large-scale operation be discovered?"

"If the tunnel is discovered during excavation, it will be useless!"

Could it be that it was a fluke that it was successfully dug up?

Chen Fujia smiled:

"It's also thanks to the market."

"The bazaar is not just about winning the hearts and minds of the indigenous people of South Vietnam and asking them to help us raise building materials to make up for what we lack."

"At the same time, it is also attracting the attention of the indigenous people of South Vietnam with cheap and high-quality goods, so that they can focus on buying and selling."

"So that the soldiers digging in the mountains and forests are more hidden and less easy to be discovered."

"We started digging these tunnels from the opposite direction of the market."

"Even some of the necessary tools for digging tunnels can be brought from Ninan-gun under the pretext of transporting goods."

"The transportation of bulk materials, also because of the large supply of the market, will not arouse the vigilance of Jiaozhi."

Chen Fujia said proudly again:

"The long mountains and dense forests are still not enough to mention in front of Your Majesty."

In and out of his words, he didn't leave the emperor, but his expression seemed to be showing off.

In his opinion, whatever he had when he proposed to open a bazaar and exchange markets with the indigenous people of South Vietnam.

Anyway, the bazaar not only won the favor of the natives of South Vietnam, but also contributed a lot in digging tunnels!

Then he is meritorious!

turned into rain but was not fooled by Chen Fujia, and knew who the credit was.

Needless to say, this incomparably sophisticated way of digging tunnels must be the same as the local dialect and culture of South Vietnam, which His Majesty has learned in depth among the people.

Li Jingji, who had been silently beside him, exhaled a long breath.

He knows about digging tunnels and has always been involved in it.

But I didn't expect there to be so many twists and turns.

From the books he read, digging tunnels first appeared in the Warring States period.

It is said in "Mozi Beixue" that if the enemy digs tunnels to attack the city, the defenders should also meet the enemy directly, dig tunnels in the direction of the enemy's caves, attack the caves with holes, and destroy the enemy army underground.

In order to keep abreast of the situation of the enemy's hole, each well is on duty with a dog on duty to "judge the location of the hole, and dig the hole to welcome it"!

Hundreds of years ago, Cao Hou, who was also an enemy and friend of Emperor Zhaolie, was also a master of cave attack according to historical records.

The famous Bozhou Ancient Road was once an underground military battle road specially built by Cao Hou for military needs.

Originally used to transport soldiers, it was later used for siege, retreat, communication, ambushes, and more.

However, I never expected that today, it would surpass any tunnel combat in the past.

The method of small acupuncture attack has been deeply studied to this level!

This is not in the book.

Therefore, when Chen Fujia was explaining, Li Jingji remembered it in his heart.

Remember every word in your heart, learn slowly, and gradually improve.

Seeing that Hua Chengyu was engaged, Li Jingji also listened attentively, and Chen Fujia pointed at the drawings again:

"See this, this is an authentic ventilation pipe, made of bamboo."

"It seems to be tilted, like a crooked painting, but in fact, His Majesty did it deliberately, because it should be installed at an angle to prevent rainwater from pouring in."

"The direction of this ventilation pipe is also particular, and Your Majesty has specially looked at the celestial phenomena to measure, so that the warm wind can blow into the damp tunnel."

"This concealment is the most important point, and the part that is exposed to the surface must be hidden to prevent the enemy from touching the vine."

"Some authentic ventilation pipes are simply set up directly in the bamboo forest, and they can't be found at all."

"And these exits."

Chen Fujia made comparisons everywhere in the drawings:

"The entrances to the tunnels have to be as small as possible to make them as concealed as possible."

"The smallest entrance, only a foot long and a foot meter, can only accommodate one thin soldier at a time."

"Skinny soldier??"

Turning into rain and listening, I was shocked.

This time, the soldiers sent to Jiuzhen County, and most of the soldiers who came to Changshan were thin and did not have any big men.

I didn't think anything was going to look at it before.

I thought that the emperor was afraid of the instability in the rear of Rinan County, so he deliberately left those burly soldiers who looked fierce to deter the wealthy families in Rinan County.

He still remembered that at that time, Chen Fujia even advised the emperor not to divide the army, but to press the whole army to break the enemy with momentum.

Now that I think about it, this horse is completely for the convenience of drilling tunnels!

Chen Fujia saw that Hua Chengyu couldn't hold his normal expression at all, his mouth was about to fall off, and he smiled even more, and continued:

"However, Your Majesty has also set up entrances with a length and width of more than three feet to facilitate entry and exit, as well as some material transportation."

"Deliveries?"

Hua Chengyu was stunned: "Your Majesty is planning to use the tunnel to fight for a long time?" ”

Chen Fujia nodded:

"It was planned like this before, if you can't take the Jiaozhi natives quickly, you have to be prepared for a long-term battle."

"But now Your Majesty has laid down the top of the mountain in one breath, and even with the power of thunder, it has completely shattered the courage of the natives of South Vietnam, and there should be no need for a long-term battle."

"Next, as long as you deal with the army in Zhang Yiping's hands, it will be enough."

Hua Chengyu and Li Jingji asked at the same time:

"How do you deal with that?"

That's the last thing they understand.

It's good to dig the tunnel.

But what's the use of digging such a tunnel?

Just to let the soldiers hide?

This can only be defended, not attacked.

But they want to take down the entire territory of Jiaozhi and return to Qiongzhou as soon as possible!

Chen Fujia slowly explained:

"Going deep into the mountains and forests, of course, we are fighting on the chassis of the South Vietnamese natives, but this has been dug underground, but it is our territory."

"Remember yesterday afternoon's battle?"

"In the torrential rain, our army was entangled by the natives of South Vietnam, and the enemy was attacked on the back."

"It seems to be a big rout, and in the end there are only 5,000 people left of more than 20,000 soldiers and horses."

"In fact, most of them took advantage of the heavy rain and the gloomy sky to touch the tunnels."

"Then His Majesty will personally lead the remaining soldiers and horses to deal with the natives of South Vietnam."

"As long as the South Vietnamese natives who have crossed the mountains and mountains are completely solved, it will be even more difficult to find the tunnels with only the army in the hands of Zhang Yiping."

"If they go deep into the long mountain, they can only be slaughtered by our soldiers hidden in the tunnels."

The soldiers of the Han army were missing, but instead of a big defeat and a rout and escaped, they sneaked and hid.

This is Liu Ke's complete plan, and he has never been defeated.

As soon as the tunnel was dug up, he directly forcibly turned other people's home field, the cow, into his own home field.

It is equivalent to that the underground of Changshan has become a three-dimensional underground combat position.

There is no need to consider the dense forests on the ground at all, which will affect the combat of the Han army.

The natives of South Vietnam are guerrilla in the mountains and forests, well, it's, then we will directly guerrilla in the ground, there are no mountains and forests at all.

"Among them, the most important thing is whether Your Majesty can take the natives of South Vietnam led by Ba Mudan."

"If it doesn't work, another battle plan can be launched."

"But at that time, the soldiers have to be prepared to fight in the tunnels for a long time."

"But now the general trend has been achieved, and our army completely occupies the Changshan area."

"And Zhang Yiping must be even more anxious, eager to block our army in the long mountain."

"Even go one step further and forcibly attack the holy place of Changshan, which is regarded as a garrison by His Majesty."

"At this time, everything is going according to His Majesty's plan."

"Zhang Yiping will definitely not have many concerns, or have the idea of standing still and retreating as advance, and will inevitably launch a fierce offensive."

Chen Fujia pointed at Li Jingji, and then pointed to the Han soldiers in the tunnel:

"After all, in Zhang Yiping's eyes, the soldiers have already scattered and fled, and the troops in His Majesty's hands are only a few thousand, but they barely occupy the top of the mountain with the momentum of thunder."

"Now that you are here, it means that everything is going well, the aborigines of South Vietnam are wiped out, and they are moving in the best direction."

"The follow-up operation must also be launched as soon as possible."

Chen Fujia raised his head and looked at the dark tunnel zenith, as if he could see through the ground countless fallen Jiaozhi soldiers:

"The end of the Cochin country has arrived."

(End of chapter)