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Li Zhong actually took people to Kuoding County the next day.

It's just that Yan Kai and the others were busy operating on Du Ruhui at that time, so they didn't pay attention to them.

The key is that the people Li Zhong led were wearing helmets and armor and holding weapons in their hands.

Kuo Dingjun definitely couldn't let them in without Yan Kai's order.

Then Li Zhong and others heard that Yan Kai and the others were rescuing Du Ruhui, but they were too embarrassed to go to Yan Kai again and again.

Those who were guarding the county town of Kuoding Army had already reported to Yan Kai, and they probably knew that Yan Kai and Li Zhong had some grudges.

Seeing that Yan Kai didn't let them in for so many days, I just thought that Yan Kai wanted to leave them alone.

Kuoding Army is naturally on Yan Kai's side, so no one has reported to Yan Kai in the past few days that Li Zhong and others are still outside Kuoding County.

So Li Zhong took people to live outside Kuoding County.

When Yan Kai remembered it, he asked people to release the three hundred people into Kuoding County.

"Commander Li, I'm sorry!" Yan Kai said with a smile.

Since Li Shimin still trusts Li Zhong and Li Zhong has given in, there is no need to make the relationship too tense.

So he took the initiative to apologize.

"Nothing, nothing!" At this time, Li Zhong had no arrogance at all.

When he came here, he arranged all the defenses himself, but some weak princes, only twelve years old, could sneak into his own camp within two months of coming to Kuoding County.

After thinking about it for so many days, he never thought about how the other party sneaked in.

Then he actually didn't just wait outside Kuoding County. On several nights, he also tried to lead people to break through and enter Kuoding County.

This won't be too shameless.

But the people in Kuoding County are like having night vision at night. No matter how hidden they are, they will be discovered as long as they get slightly closer to Kuoding County.

Another day, he asked someone to pretend to be a businessman during the day and wanted to sneak into Kuoding County. As a result, his people were taken away as soon as they entered the gate of Kuoding County.

This also made him puzzled. Could it be that there were marks on his face?

Otherwise, with so many people coming in and out of Kuoding County every day, why would their own people be taken away?

When Li Zhong saw Yan Kai again, he no longer had any pride.

These people will eventually return to Chang'an after training.

And in Chang'an, weren't they controlled by Li Zhong? It is impossible for Yan Kai to leave Kuoding County and go to Chang'an to take charge of these future spies or special forces.

Therefore, the stronger these people are trained by Yan Kai, the stronger his subordinates will be in the future.

After understanding this, Li Zhong no longer cared about Yan Kai's neglect of him.

The three hundred soldiers he brought were also kept submissive by Kuoding County's infiltration and defense.

On the first day of training, whether they were asked to fold quilts, tidy up the house, or stand in military posture, these three hundred people did not have any doubts.

He did whatever he was asked to do, but he was much more powerful than that group of naughty kids back then.

Gradually summer is coming, and this year there is another severe drought.

In particular, people from all over Guanzhong are reporting that the keel waterwheel provided by Youyankai is useless because there is no water in the river.

Although the government had already made preparations and had a lot of food in stock, the people were still anxious looking at it.

In particular, the government issued an early warning that there may be a locust plague after this year's severe drought, which made the people even more panic-stricken.

Du Ruhui put down the report in his hand, and then asked Yan Kai, who came to visit him: "Mr. Yan, does he have any way to deal with it?"

Yan Kai nodded and said: "There are indeed some ways. Our Kuoding County has invented a small-diameter well drilling technology that can drill deep wells dozens of feet deep. While irrigating farmland with groundwater, using our drip irrigation technology, it should be possible Let the people survive this drought safely.”

Yan Kai was not joking, he was talking about the way Zhuo Tsutsui was dug.

According to the records in "Dongpo Zhilin", this kind of water well that appeared in the Qingli year of the Song Dynasty first appeared in the salt fields of Sichuan.

When digging a well, a round-edged iron file is used to create a well mouth as big as a bowl and dozens of feet deep. Giant bamboos are used to remove the joints and connect them to form the well wall. Then use thinner bamboo to make buckets to extract brine. One bucket can carry several buckets.

In the same way, it is also feasible to use it to extract ordinary groundwater.

Moreover, the development of Zhuotong Wells reached the Ming and Qing Dynasties, and the depth of the wells could reach more than 200 feet.

The deepest Zhuotong Well in the Qing Dynasty reached a depth of 320 feet, which is almost a thousand meters deep.

It made Yan Kaidu sigh that the wisdom of the ancients was really too strong.

These tools are all recorded in Ma Ji's "Salt Well Illustrations" of the Ming Dynasty. Yan Kai made many of them by directly asking someone to follow them, and he has successfully tested them in Kuoding County.

"There is only one problem now!" Yan Kai said with an embarrassed smile: "If I send all my people out to dig wells in various places, all I will do is lose money."

"I can afford to lose money on this deal, but this is not the first of its kind!"

Yan Kai has always insisted on fair transactions and does not use them to subsidize the entire Datang County.

Otherwise, no matter how rich Kuoding County is, it cannot afford subsidies.

He had previously sent letters to various state capitals, saying that he wanted to collect money and send people to dig wells, but he received very few replies.

Some of the replies came from people complaining about their lack of money.

Yan Kai discovered this problem, that is, other parts of the Tang Dynasty had begun to rely too much on Kuoding County or wanted to take advantage of Kuoding County.

If things continue like this, problems are bound to arise.

This is what worries him now.

"Some people in the court say that you are only interested in profit, and they are right!" Du Ruhui said this, but there was no derogatory meaning in it.

Even this time when he was undergoing treatment in Kuoding County, Yan Kai charged him a medical fee that made him feel painful.

The Du family had no complaints. After all, they were willing to spend any amount of money to save Du Ruhui's life.

It's just that some middle school boys expressed confusion. Yan Kai, who usually has a good relationship with the Du brothers, actually charged so much for consultation at this time.

Du Ruhui asked Du He to tell everyone a story, that is, there is a bridge on a river.

If you walk from the bridge, you will save less than half an hour's journey.

But the bridge is very narrow and only a few people can pass at a time.

When there was no toll on the bridge at first, everyone was crowded at the end of the bridge waiting to cross, which actually made many people spend more time taking a detour.

And people who are really in a hurry to cross the bridge cannot reach the other side of the river quickly.

But later the government started to charge a fee for the bridge, and then only people in urgent need would cross the bridge.

After telling this story, those middle school boys roughly understood Yan Kai's intention.

Yan Kai knew that if word spread that Kuoding County could perform liver transplantation, sick people in the entire Tang Dynasty would run to Kuoding County.

Can he still allow modern experts to come to Kuoding County to perform surgeries 24 hours a day?

At that time, I am afraid that Sun Simiao and those students studying medicine will not be able to guarantee their normal study and research.

"So Mr. Yan is worried that no one will pay for this money, right?" Du Ruhui said with a smile: "Then let me write a letter to His Majesty and ask for the money from Mr. Yan?"