Daqin Engineers

What happened after that was exactly like what Yang Duanhe said, there were no Wei soldiers blocking all the way, and abandoned city walls and villages were everywhere.

In fact, let alone the road, when Qin Jun arrived at Daliang City on the ninth day, he found that the small fort outside the city was unguarded.

These small forts were the strongholds that Wei Jun built outside the city and echoed with Daliang City.Most of them are built on high places for condescending defense, and they are also close to the river, so they can easily get the support of the Wei Shui Army and the infantry.

Wei Jun even surrendered these dangerous small forts, making the Qin army who took over it feel incredible.

But of course Qin Jun would not be polite, splitting into several parts in several directions to seize the commanding heights and important places outside the city to encircle Daliang City.

Among them is a place called Guangwu Mountain in the north of Daliang.

This Guangwu Mountain is divided into two small hills on the left and right, and a mountain stream with a width of more than a hundred steps in the middle is called Guangwu Stream.

From here, the water of the Yellow River flows into the Bian River surrounding Daliang City through the natural Guangwu River.

Like other places, this Guangwu Mountain also has a small fort:

There is a small fort that can accommodate more than 50 people on the east and west hills, and there are also several trebuchets in the fort.

This is a dangerous place where a man can do nothing, and the small fort on the hill can use bow and catapult to reinforce each other:

If the Qin army attacked the East Fort, the Wei soldiers of the West Fort could use crossbows and trebuchets to hit its side.

On the contrary, the Qin army attacked West Fort.

At the same time, it was only 30 miles away from Daliang City, that is, the Wei Yuanjun could arrive in half a day, and the navy could even reach it in an hour.

You must know that Qin Jun intends to attack the main beam.

If Wei Jun stubbornly guarded this water inlet and sent a steady stream of reinforcements, I'm afraid that Qin Jun's strategy would be deadlocked before it even started.

But Wei Bing was still evacuated cleanly, leaving only a pile of burnt down houses and trebuchets.

The structure of the small fort is quite intact and not destroyed at all.

Shen Bing guessed that this should be because Wei Jun thought that the Qin Army would return without success before long, so he was reluctant to destroy the small fort and only waited for the Qin Army to retreat before returning to receive it.

It's a sigh that these Wei Jun didn't understand what was going on. The castles they gave up might never be returned to them.

Shen Bing's engineering unit was divided into two and temporarily stationed in these two small forts.

Zheng Guo also rushed with his team of hydraulic workers... Their task was to explore the river mouth hydrology.

Then Yang Duanhe and his guards also camped nearby.

There is no other reason. This Guangwujian is the first part of the water attack, which is the interface between the Bian River and the Yellow River. It is related to whether the water is so strong that it can destroy Daliang City.

Shen Bing was sent as Zheng Guo's assistant to follow the survey, but Shen Bing didn't know much about hydrology. He only watched Zheng Guo and his group take a small boat there to measure the flow velocity and water depth, and from time to time they dive into the water to measure silt.

Half a day later, Zheng Guo knew it, and several people gathered in Yang Duanhe's handsome account to discuss.

"How?" Yang Duanhe asked, "Is the water attack feasible?"

Zheng Guo replied:

"As expected, the estuary is seriously blocked. If you want a water attack, you must first dig the mud to remove the silt."

Yang Duanhe answered:

"It shouldn't be too late for such a thing. The water workers just issue the order, and I will start dredging immediately."

Zheng Guo hesitated and said:

"I'm afraid it's not as simple as the general thought."

Yang Duan and Qi Dao:

"Why?"

Zheng Guo put a hydrographic map in front of him and said:

"Please look at the general, the subordinates will divide the silt removal into three stages."

"The first section is Guangwu Stream. I am waiting to widen the mouth and remove the silt at the bottom of the river. Only in this way can the water volume be sufficient and the water is turbulent."

The Guangwu Jianjiankou was blocked by the Wei people deliberately with rocks. This was not to prevent the Qin army from attacking the water, but to control the amount of water... When the Yellow River flooded, too much water flowed into the Bianhe River, and the Wei people used rocks to plug the Jianjiankou for regulation .

At this time, if the Qin Army wanted a water attack, the water potential would of course be as strong as possible, so the rocks should be cleared.

"The second is the middle section." Zheng Guo continued:

"Here only needs to clear the mud at the bottom of the river."

"The most difficult part is the third place... this section of the river is close to the Weijun Liangcheng. How can I wait to dredge the enemy's city?"

Yang Duanhe frowned upon hearing this and asked:

"Does this section of the river have to be dredged?"

Zheng Guo replied:

"Although I did not survey on the spot, I judged from the trend of the river course and the degree of sedimentation at the river bottom..."

"If this section of silt is not removed, the river may overflow before it rushes into the beam."

"At that time, the water attack beam will only turn the large fields outside the city into a swamp, and it will be even more unfavorable to attack the city."

What Zheng Guo said was authoritative, so Yang Duanhe was not allowed to believe it.

But like Zheng Guo said, dredging under the city wall?

How to dredge?

Haven't you died?

A random row of arrows shot from the head of the city can cause heavy casualties to the Qin army who dredged the silt.

So there is such a problem:

If the third section, the section under Daliang City, cannot be dredged, is there any need to clear the other sections?

If the other sections are cleared, and finally because of the third section, I can’t attack Daliang City in water, wouldn’t it be useless?

After being silent for a while, Yang Duanhe said:

"Perhaps, I can take the night to dredge."

But even Yang Duan and himself felt unreliable when he said this.

That's the moat under the Wei Jun city. Even if the Qin Jun doesn't light the torch, Wei Jun will throw a few torches down, and then there will be a rain of arrows... How many Qin soldiers will be killed or injured in this way to clear the mud?

This is only one of the difficulties.

Then Zheng Guo said another bad news:

"I may only have more than ten days to wait!"

"If it can't be done in more than ten days, I'm afraid we will have to wait until the beginning of spring next year."

Yang Duanhe asked puzzledly:

"Why is this again?"

Zheng Guo pointed to the hydrographic diagram and explained:

"The upper reaches of the Yellow River is located in the north, and the cold weather in the north will freeze it."

"If the upstream is frozen, the water volume of the river will drastically decrease, and then..."

Shen Bing knows a little bit about this. The Yellow River has a peculiar phenomenon called "Lingxun".

"Lingxun" occurs on a river flowing from south to north.

After the winter begins, the river in the north will freeze, and the river in the south will continue to flow down and be blocked, causing flooding.

This is also the reason why the Yellow River floods at all times. It may flood all year round, and the time is not certain. For example, the winter flood season is related to temperature and cold currents.

The reason why the Yellow River is said to be "peculiar" is that its river course is in the shape of "ji".

So there are two locations where Ling Xun will occur.

One section is at the head of a few characters, and the frozen location is in the Hetao Plain, which is the northern land set by Li Mu of the original Zhao State.

The other section will be frozen at the end of a few words, which is located in the Jinkou area of ​​Yan State.

The Northland was frozen first, so there was little water in the middle and lower reaches during this period.

Only when the temperature rises in the north of next year and the snow melts, the water volume will increase again.

So Zheng Guo said that if it can't be completed in more than ten days, I'm afraid we will have to wait for the beginning of spring next year.