"Bang dang..."

The sound of the broken hammer falling to the ground in the distance awakened the four people watching the fun.

"Oh my mother, how are you doing?"

Xue Wanjun's mouth was much faster than his hands and feet. He shouted gloatingly while he was still there, and then he walked over and helped Yuchi Gong up slowly.

Although Yuchi Gong has been practicing martial arts for many years, he has only had time to protect his old face when his body suddenly loses its center of gravity. Otherwise, he might have knocked off a few big teeth.

"Yoyo~~~You are gentle, it seems to have flashed to your waist."

Xue Wanjun's face was immediately gone, and he put his hands under Yuchi Gong's armpit and gently helped him up, but he said strange words, "General Yuchi is really mighty. He can even flash his waist with a hammer."

Li Shimin walked up to hold Yuchi Gong's arm and asked with concern: "How do you feel?"

Yin Qingfeng didn't expect Hu to have this situation, but he only glanced at Yuchi Gong and focused on the cement board. He felt relieved when he saw that the cement board was only cracked in half.

Yuchi Gong stood there, twisted his waist a few times, and then straightened his chest, "Huh~~ It's okay... By the way, has the stone slab been smashed?"

Li Shimin and Xue Wan both turned back and looked to the ground.

“Huh~~”

Xue Wanjun knelt down on one leg and stood up half of the cement board. He looked at the mouth, compared the half on the ground, then looked up and asked Yin Qingfeng, "Yin Xiaolangjun, what is this?"

Li Shimin, Yuchi Gong, and Li Jinan also saw something strange. If it were an ordinary stone slab, in the situation just now, it would definitely be more than just broken into two pieces. Otherwise, when Yuchi Gong knocked the first time, they would not raise their arms to cover their heads and faces.

Yin Qingfeng clasped his fists and said to Li Shimin: "Congratulations to uncle, he has obtained a weapon that benefits the country and the people."

Xue Wanjun asked in front of Li Shimin: "What do you mean by your boy?"

Yin Qingfeng pointed at the cement board and said, "I grind several kinds of rocks and calcined them with fire, then mixed them with pebbles and fine sand, mix them with water, and after cooling and solidification, they will become the cement board in front of me."

"Cement board?" "Rock calcined?" "Can it be so strong?"

The other three couldn't help but ask one of them. However, Li Shimin stroked his beard and looked at Yin Qingfeng with his eyes wide open for a long time. "Are the types of rocks you mentioned rare or can you find them normally? Is it troublesome to calcin those rocks?"

Yin Qingfeng praised Li Shimin's reaction in his heart. He replied respectfully: "Those kinds of rocks can be found in various parts of the Tang Dynasty, and it is very simple to burn."

Li Shimin was obviously relieved, but then he said nervously: "Isn't that..."

Yin Qingfeng replied understandably: "Before this, who would have thought of grinding the rocks and calcining them? Besides, even if the Turks knew about them, they would not be able to fire them unless they occupied the south of the Great Wall. Moreover, my nephew was eager for them to learn!"

"Hmm?" "Ah?" "What?"

Faced with different doubts, Yin Qingfeng said relaxedly: "Just like my uncle's concerns, cement is simple and convenient for building a city. But we Han people have been fighting with the Hu people on the grassland for so many years and have not completely eliminated them because they have no place to live.

Once they really live in a certain place and use the means of the Han people siege the city, what if they build a high or solid city wall? As long as the army sieges the city, what will they eat and drink? They will be trapped to death."

Except for Li Jinan, the other three have many years of experience in fighting. They only thought about Yin Qingfeng's words for a moment and nodded in recognition.

Xue Wanjun said excitedly: "You guy is so bad-hearted!"

Yuchi Gongze gave him a blank look and said to Li Shimin: "Since the young man Yin has offered such a powerful weapon, please ask the prince to make good use of this thing!"

Li Shimin did not answer him immediately, but thought for a long time before saying to Yin Qingfeng: "This is called...Cement, right? Since it was made by you, what do you have any ideas?"

Yuchi Gong and Xue Wanjun thought to himself: "Yes! Since this kid can make such magical cement, it is naturally impossible that he has not thought of a way to use it. Let's see what he said."

Of course Yin Qingfeng would not hide it. "I defined cement as a building material. It can be used to build cities, bridges and roads. No matter which aspect it is used, there are three distinctive characteristics: fast, simple and firm.

Taking the construction of a city as an example, as long as there is enough manpower and cement, another city wall of Chang'an City can be built within ten days."

"What?" "Ten days?"

Yin Qingfeng ignored the surprise of the two generals. He continued: "Although my nephew wished that the Turks could use cement to build a city, he could not allow Tuyuhun, Tubo and the countries in the Western Regions to obtain cement. Otherwise, it would be difficult for me, the Tang Dynasty to conquer them again."

Li Shimin nodded, this was what he was worried about.

"However, my Tang Dynasty can erode them step by step by step by building a city.

Take Tuyuhun as an example.

Yang Guang originally sent Pei Ju, the minister of the Huangmen, to lobby Tiele, and sent troops to attack Tuyuhun. But Fu Yun was afraid of the strength of the Sui army and led his troops to go west. The next year, Yang Guang fought again and escaped by Fu Yun. After the Sui army returned to the east, Tuyuhun rekindled and became a disease of tinea scabies in our Tang Dynasty.

Therefore, based on the characteristics of cement's rapid construction of the city, my nephew advised his uncle to completely eliminate Tuyuhun by siege."

Not only Li Shimin, Yuchi Gong and Xue Wanjun held their breath and waited for Yin Qingfeng to speak down. Even Li Jinan, who had always been focused on serving Li Shimin, pricked up his ears, wanting to hear what Yin Qingfeng could say.

No matter how much he is, he is the ambition of making achievements, Li Jinan's heart, Li Shimin is the largest. The reason why he expressed his kindness to Yin Qingfeng was because he knew how important Yin Qingfeng was to Li Shimin.

"Build a castle every fifty or sixty miles, and each city is stationed with an army of one thousand to two thousand. As long as the city wall is built strong enough and high enough, Tuyuhun cannot defeat even a hundred thousand troops. But if Tuyuhun ignores it, these thousand or two thousand cavalry can harasse their rear arbitrarily.

If Tuyuhun wants to leave an army to restrain these cavalry, they will have to leave at least twice the strength of each castle. Ten castles require 40,000, and twenty of them require 80,000..."

"Thirty castles are 120,000 people." Yuchi Gong answered first.

This time it was Xue Wanjun's turn to roll his eyes, "You are stupid! How many troops are they in total? After leaving 120,000, how many troops do they have to fight to the final battle? Besides, it's hard to say whether they can raise 80,000 people at once, but there are still 120,000!"

Yuchi Gong slapped his forehead, "Hehe..."

Li Shimin thought to himself, "It's so lingering! I just planned this way, but fortunately I didn't say it..."

Yin Qingfeng smiled and continued, "When the city was first built, Tuyuhun should not be able to react. When they react, they will definitely gather all the troops to counterattack. Otherwise, they will have to sit and wait for death.

Therefore, if my Tang Dynasty is not ready for a decisive battle, we will postpone the implementation of the siege plan first."

Yuchi Gong and Xue Wanjun also nodded. Li Jinan looked at Yin Qingfeng happily.

After Li Shimin nodded, he began to think about Tuyuhun.

"In August of the previous year, Tuyuhun invaded Minzhou and was repelled by Dougui, but Taozhou was captured; in May last year, Tuyuhun joined forces with the party Xiang to conquer Hezhou, and the governor Lu Shiliang was defeated...

Although the losses were not caused much each time, as Yin Qingfeng said, it was just a disease of scabies in the Tang Dynasty, but the Tang Dynasty had to set up a large number of soldiers in various states to confront them.

Now that we have this method of building a city in cement, Tuyuhun’s destruction of the country is just around the corner. It’s just this opportunity..."

Before Li Shimin came to a result, Yin Qingfeng continued to say there: "Tuyuhun, Tubo can use the method of building a city to eat, but when operating the Western Regions, cement castles can become a weapon to defend the city..."

Li Shimin was shocked, "This kid has a great ambition. He not only cares about Tuyuhun and Tubo, but also has strategies for the Western Regions."

"The Western Regions countries built cities with land, which is not only easy to conquer, but also difficult to defend. In the future, every time our Tang army occupied a place, we can use cement to build cities.

My nephew’s idea is to build a castle along the trade route all the way west.”

The name of the Silk Road was first proposed by a German in the late 19th century, so Yin Qingfeng could only be replaced by a trade route.

"Every sixty miles is an inn that can accommodate five hundred people; every hundred and twenty miles is a castle that can accommodate two thousand people; every three hundred miles is a city.

As long as the Tang Dynasty kept repairing castles and cities to the west, the Tang army could use these castles and cities to eliminate and subdue all foreign races!”

"Okay!" "Kill the fuck!"

Although Li Shimin was not as excited as Yuchi Gong and the others, he could tell that he was not calm in his heart when he looked at his nose.

Li Jinan grinned and looked at Yin Qingfeng happily.
Chapter completed!