At noon, the early autumn sun is not hot.

Outside the Nihuang Palace, a team of people is gathering.

There are no gongs and drums, but there are colorful flags swaying in the wind.

The bunting is actually not colorful, with black characters on a yellow background, and the word "Yang Yan" in the big book.

For the residents of the border villages, seeing this colorful flag is like a daily routine.

But since the day of the execution, the bunting has not been seen for several days.

When I saw it today, I didn't have to think about it to know that the annoying fourth prince was going to leave the palace again.

This is the first time Yang Yan has walked out of the Nihuang Palace.

But before the travel team was assembled, he felt the deep hatred of the people in the border countryside for the four princes.

It's no wonder that the four princes didn't give money to eat, and they did a lot of dirty things like molesting people's girls.

After all, Yang Yan has obtained his skin, and this pot has to be carried, and it can be regarded as the gain and loss of the Mandate of Heaven.

However, this image must be reversed, after all, it is not feasible to rely on the group of listless soldiers in front of us to protect the border areas, and such a heavy task must unite the broad masses of people to be safe.

"Old thing, the border countryside needs a poverty alleviation team, and I want to see your plan in three days. ”

"Yes, Your Highness. Ji Huaan climbed on the back of the horse under Cheng Han's contemptuous gaze, although he didn't understand the prince's meaning, he immediately agreed first.

He knew that there was a fool who didn't understand and asked by his side anyway, and he didn't need him to show his ignorance.

As he expected, Cheng Han opened his mouth and asked, "Your Highness, what is poverty alleviation?"

"Where there is poverty, help wherever you are!" Yang Yan dropped a sentence without thinking and walked into the carriage.

The carriage bumped around the border towns and came to the artisan ghetto before the sun set.

Poverty immediately opened in Yang Yan's eyes, the dilapidated thatched house, the yellow-skinned passers-by, and the tattered clothes all stinged his eyes.

In the border countryside, craftsmen have nowhere to make a living, and their lives are worse than that of farmers!

"Your Highness," Cheng Han looked at the head sticking out of the car window, thinking that he could hold back, but in the end, he still couldn't hold back, and asked the words that had been pressed in his heart for a few days, "You summoned the hunters and local guards before, and now you are going around the border towns and villages, do you plan to stay during the beast season?"

"What do you think?"

"Absolutely not!" I didn't think about it, I really guessed it in my heart, and Cheng Qiang's face was anxious, "Your Highness, according to the hunters, it is difficult to deal with the wolf species alone, it is said that the bow and arrow cannot be shot, and there are many of them, not to mention that there are more terrifying hybrids, if there is no strong city wall to rely on, it will not be able to stop it with just a few local guards, but I am afraid that the casualties will begin to collapse before half of them are over!"

"You also said the same when you saw Mo Xiaobei, my commander, what else are you not afraid of!?"

Yang Yan sighed.

"Your Highness, as your commander, I must make the fact that we can't hold the border countryside, and we can't let you take any risks!"

"Yes, Your Highness, it's better to withdraw to the Iwagu Fortress for insurance. Ji Hua'an's chick pecked at the rice, and he also agreed with Cheng Han's opinion.

"Shall I give you a city wall?" Yang Yan looked at Yiwen and Yiwu's two henchmen, and said word by word, "It is built between the foot of Nanshan Mountain and the Yanshui River, it may not be as tall and magnificent as the city wall of the royal capital, but it is enough to keep the evil beast out of Nanshan!"

"Your Highness, do you know what you're talking about?" the commander Cheng Han was amused, "There must be a limit to nonsense, if you don't leave then, don't blame the general for being rude." ”

Ji Hua'an agreed with Cheng Han in his heart, but thinking of the recent changes in the prince, he looked at the prince expectantly, "Your Highness, since you plan to do this, have you thought of a way to build this wall within three months?"

"Don't say three months, even three years is not enough!" Cheng Han interjected, glared at Ji Huaan, thinking that Ji Huaan was also crazy, "It takes a lot of stonemasons to build the city wall, and the foundation must be tamped with mixed soil, and it must be tamped every two feet high, otherwise it will collapse if it is piled high!"

"Your Highness, what the big man said is true, this is just the simplest earth wall!" Ji Hua'an took over the conversation and looked at Yang Yan who was light and breezy, "A stronger masonry wall is even slower, and it takes hundreds of stonemasons to chisel the stones into squares first, and then build them one by one. And if you want to block the evil beast, you must use masonry walls, I wonder if Your Highness can find a way to greatly shorten the construction time?"

"Absolutely not!" Cheng Han took over the conversation, completely ignoring Ji Huaan's eyes, "Let the city rise from the ground day and night, even myths and stories don't blow like this!"

This Yang Yan is helpless, this Wen Yiwu and his two henchmen usually disagree, but now they are unified, or directly or tactfully let themselves evacuate when the beast is in season.

Needless to say, if you keep talking, these two guys will definitely be another performance of you singing and me on stage!

"I understand your concerns, so if there is no reliable wall by then, I will evacuate with you to the Iwagu Fortress. ”

The commander of the guards knelt on one knee, "Swear to protect the safety of His Highness!"

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The carriage stopped in the square of the artisan settlement, and Yang Yan did not rush to get off.

I took a sip of the bitter ale brought out of the palace, and my mood recovered a lot.

He had already decided to stay and stop the evil beasts, after all, he couldn't even hold the base camp, so how could he talk about development.

If we want to build a strong wall between Nanshan and Yanshui River in three months, the current technology of the world cannot do it, and we must adopt reasonable plans and new technologies that cross the ages.

Cement is the new technology!

Yang Yan has understood that the Yanshui River is on the left side of the township, and the Nanshan Mountain is more than 10 kilometers away to the south, and the nearest part of the Nanshan and Yanshui River is only more than 1,000 meters, which can be said to be a natural pass.

The Nanshan Mine has a history of large-scale mining, and there are many quarried rock layers around the cave entrance.

These gravels are rich in calcium carbonate and can be used as limestone when ground up.

Anyone who has studied chemistry knows that with limestone, it is equivalent to cement!

Cement, a hydraulic material that can change the history of human construction, has a wide range of raw materials, simple preparation, and one of the sharp weapons that must be carried by real numbers!

The current situation is unrealistic to engage in concrete walls, Yang Yan has estimated that this guy needs too much cement, and he is not sure that he will burn so much cement powder in three months.

Now the most affordable and time-saving is the rubble self-weight wall!

Rough stone, as the name suggests, is unpolished stone. This thing is irregular, and traditionally requires a stonemason to polish it into a square before it can be used, but with cement as a binder, this process is missing, which is a huge time saver!

The general direction was set, but Yang Yan understood that he had to do it himself, because no one except himself knew how to calcine cement, and the rubble walls were all brand new, and no one understood.

The next three months are busy!