After hearing this, Liu Tan's mouth twitched, and for a moment he really didn't know how to answer this question.

Indeed, designing a dam requires corresponding water conservancy knowledge, or in other words, one must have mastered water conservancy knowledge to the highest level to have this ability.

But Liu Tan didn't need to know so much. He could just take out all the things from later generations and use whichever one was suitable.

He had no choice but to start talking nonsense in front of Liu Che again: "The dam was just an idea I had on the spur of the moment. Xu Lin was the one who actually researched whether it was suitable for this location. Besides, this dam is a little different from my original design, so... I just came up with an idea."

Well, this is true. He did not lie to Liu Che. Although they were both gravity dams, the one built by Xu Lin was different from the one he drew in many places. Those differences were beyond the reach of current technology, so they needed to be deleted. Then those things appeared particularly abrupt on the drawings, and actual construction certainly could not be based on the drawings.

Liu Che didn't know whether to believe it or not, so he didn't continue the topic. He just asked, "What is that thing Xu Lin is sitting on? Why does it look so strange?"

Liu Tan thought Liu Che hadn't noticed, so he immediately said, "That's called a wheelchair. Father, do you remember the ice cart? It's basically an ice cart with the blades replaced with wheels. Xu Lin's eyes can be cured, but his legs can't be restored. I asked him to give lectures at the academy before, but he refused because it was against the academy's regulations to be carried in and out himself. So I had no choice but to get him a wheelchair so that he could move around on his own."

Liu Che took a look at Liu Tan and knew that this thing must have been made by Liu Tan.

At this moment, Liu Che seemed to understand why people like Huo Guang and Jiang Chong were so devoted to Liu Tan. His son was really confused when he was confused, but he really cared about his own people.

Just as Liu Che was pondering this, he heard Liu Tan speak, "Your Majesty, I have already had some wheelchairs prepared. I understand that many veterans were injured on the battlefield or are too old to walk due to injuries. When Your Majesty returns, please bring these wheelchairs back as gifts or rewards."

After hearing this, Liu Che teased him, saying, "That was my reward, but it's not certain that anyone will remember you, the King of the Northern Territory."

Liu Tan said as if it was a matter of course: "Isn't what belongs to me also my father's?"

Why did he want those people to remember him? Although Liu Tan used the excuse of being a military general, it was not just the generals who had difficulty walking due to old age. Moreover, the distinction between civil and military officials in the Han Dynasty was not so clear, at least not like in later generations.

This is because the country has been at peace for a long time. If we go back a few decades, many generals would have fought on the battlefield.

Anyway, the people who could get Emperor Wu of Han to give them a wheelchair were not ordinary people. If they were princes with ulterior motives, they would definitely choose to please them, just like Liu An, the King of Huainan. But Liu Tan was not like that. He just wanted to stay in his small piece of land in the northern border country, so he should give this favor to Liu Che.

Liu Che knew what Liu Tan was avoiding without much thought. He felt relieved but increasingly dissatisfied with Liu Qumao. He calculated that this prime minister had been in office for two or three years, which was not a long time but not short either. There seemed to be no problem in replacing him. As for the reason for the replacement... it was a joke. Did an emperor with such great power like Liu Che need to find a reason to replace a minister?

What's more, the Embroidered Uniform Envoy had a lot of negative information about Liu Qumao. For the sake of his surname Liu, Liu Che would give him a reason.

Liu Tan had no idea that Liu Che was planning to change the Prime Minister. He was taking Liu Che for a stroll across the grassland, saying, "With water, in a few years, this grassland might be able to grow some crops that are more cold-resistant and less demanding on the soil."

After hearing this, Liu Che looked around and felt that if such a large grassland was really utilized to grow crops, then the granary of the Han Dynasty would not be limited to the Qi area.

Liu Tan thought so too. A gust of wind blew, and the green grass was bent. He suddenly remembered that animal husbandry also occupied a place in the Northern Border Country, so not all grasslands could be turned into arable fields. In addition, trees had to be planted for the sake of the environment.

This requires careful planning for the entire Northern Territory.

Liu Tan was thinking about this when he suddenly saw a few black spots not far away. He squinted his eyes and asked, "What are those in front?"

Liu Che also looked over. At this moment, Lu Xuan suddenly said, "It's a pack of wolves."

"What? Wolves?"

The team was in a panic for a moment. A single wolf was nothing, but a pack of wolves posed a huge threat. Even though there were so many of them, if they were not careful, they might end up in trouble.

The officials brought by Liu Che were a little nervous and said quickly: "Your Majesty, please withdraw to the camp."

Liu Che didn't say anything, his face looked a little solemn. At this time, the wolves seemed to have discovered their prey and were running towards them at a rapid speed.

He said, "It's too late."

Liu Tan subconsciously tried to pick up the bow and arrow but found nothing. Then he remembered that he had no intention of hunting this time, so he didn't bring his bow and arrow with him at all.

Fortunately, the elite troops he brought with him were armed with bows and arrows, so they turned around and shouted, "Line up!"

The elite group he brought out this time consisted of two hundred people. They were all equipped with the best equipment and should have no problem dealing with these wolves, at least scaring them off.

As a result, just as he had formed his team, Lu Xuan had already rushed out with his dozen guards. As the horses were galloping, the Wusun people, led by Lu Xuan, drew their bows and arrows, their waists and legs were extremely steady.

Lu Xuan and his men seemed to be running without any plan, but everyone's shooting range just happened to cover each other. After a round of volleys, a group of wolves running in the front fell down immediately.

At this time, the wolves had already shown signs of retreating, but it would take time for them to turn around and run. At this moment, Lu Xuan aimed at the white wolf leading the pack, drew his bow and shot it almost in one go. The white wolf howled and fell to the ground, dead.

At this time, Liu Tan's elite troops had already rushed over and surrounded Lu Xuan's men.

As a result, not a single wolves escaped.

Lu Xuan dismounted, looked at the white wolf, gestured for it to be put away, and then turned and galloped back, saying with a smile, "That white wolf's fur is quite good. I'll have it tanned and made into... a fur coat for Your Majesty."

When Lu Xuan aimed at the white wolf, his first thought was that he could make a fur coat for Liu Tan before winter came. White fur coats were very rare these days.

The white fox is an Arctic fox. It is not found in the territory of the Han Dynasty. It can only be obtained by trading with people there. But even Liu Che did not have many, let alone others.

The white color of the white wolf's fur is somewhat different from that of the white fox. The white wolf's fur has a silvery feel, which looks better.

Lu Xuan could already imagine how good Liu Tan would look wearing it, and was preparing to come back and take credit for it to Liu Tan, but then he saw Liu Che. The words on his lips had to be changed, and he presented the white wolf skin to Liu Che.

Liu Che glanced at Lu Xuan with a half-smile, but didn't expose his criticism. Instead, he praised him, "The Wusun King's men are indeed all brave and valiant."

Lu Xuan said embarrassedly, "They don't know anything. They only have some skills in horseback riding and archery."

Liu Che said: "It is a skill to be able to reach the extreme in this field."

Liu Tan nodded seriously, then said to the elite regiment that had just returned from cleaning up the battlefield, "It seems like you've been a little slack lately. Go back and practice more."

Everyone in the elite group stood there in a daze, feeling quite at a loss for a moment.

Liu Tan couldn't say much in front of so many people. If they were alone, he would probably start training.

Look at the people under Lu Xuan. Even the horse gear they use is the most primitive. The elite regiment uses the best weapons and equipment, but they are always outshined by Lu Xuan's people. This is the result of meticulous training. Lu Xuan would not train his soldiers as comprehensively as he does. There is even no other person in the world who trains his soldiers in this way. Where the hell can he put his face?

The elite troops came over one by one with drooping heads. Liu Che reached out and touched his son's head and said, "Alright, the Wusun King's men are all veterans of many battles, and your elite troops have never been on the battlefield. Don't be too harsh on them."

Liu Tan glanced at the listless group of kids and sighed, "We've done this kind of drill many times before. What went wrong?"

After hearing this, Liu Che asked, "A confrontation exercise? What is that?"

Liu Tan explained, "It's about simulating different terrains and situations, then splitting the troops into two groups and pitting them against each other to see which side wins. This will test the quality of the soldiers and the ability of the generals, and involves many aspects. If your Majesty is interested, I'll show you the strategy when I get back."

This kind of confrontational exercise was something Liu Che had never heard of before, and no one had ever thought of it before.

After all, the concept of military professionalization didn't exist back then, so how could one even think of specialized combat training? Elite soldiers and generals were always a minority, so battles where the few defeated the many were always praised, because, in essence, wars these days were all about numbers.

Although Liu Che did not think that the Han Dynasty was suitable for this, he was still very interested in this confrontation exercise.

Seeing his expression, Liu Tan added, "How about I arrange a confrontation exercise for you, Father, to watch first."

Liu Che readily agreed, but the soldiers of the elite regiment behind Liu Tan instantly turned pale. Compared with the confrontation exercises, additional training was nothing.

At this moment, a burst of hurried horse hooves was suddenly heard. Not long after, a young eunuch ran over and handed a bamboo tube to Bu Fan.

Bu Fan quickly handed it to Liu Che. After Liu Che took it, he took a look, looked up at Liu Tan and said, "We've caught him."

Liu Tan was stunned for a moment: "Who is it?"

Liu Che's face darkened, and he gritted his teeth and said, "The one who spread the ballad behind my back!"

Can this little bastard please be more careful?