I was engaged in infrastructure construction in the Han Dynasty [Transmigration Book]

To be honest, Liu Tan praised King Zuo Tuqi sincerely, because he was the first person who was not frightened by gunpowder and insisted that it was a miracle.

They really carefully analyzed the properties of the powder keg, and then came up with their own countermeasures for this property, which is really something.

It's a pity that he is an enemy, otherwise Liu Tan would definitely drag him into the academy in the northern border country and try his best to cultivate him into a scientific successor.

Lu Xuan obviously didn't think so much. Regarding this sudden situation, he was not flustered but also not happy. He looked at Liu Tan and asked, "Do you want to choose another method?"

Liu Tan asked, "What can you do?"

Lu Xuan said calmly, "Go up the mountain, Rolling Stone."

This is a method they often use, and it is not particularly novel, but it is expensive and easy to use. The only thing that needs to be entangled is that there does not seem to be such a large rock on Yanran Mountain.

Liu Tan said: "King Zuo Tuqi must be prepared for this, so this method may not be so easy."

Of course it's not easy, so conflicts are certain, and it's not like Lu Xuan has done this once, he has sufficient experience in this regard.

But he thought for a while and still didn't say anything, just said: "Then what method do you say, I will listen to you."

It was obviously a very common sentence, but for some reason, it hit Liu Tan, making his ears feel hot.

He thought for a while and said, "Actually... the mines are available."

Lu Xuan was stunned for a moment: "What? Didn't it mean that the landmines are not completely safe yet?"

Liu Tan smiled slightly: "That's right, but we can add something to that organ so that it will ignite when it encounters a strong collision."

Although it's called a mine, he has the final say on how to use it.

When the time comes, throw the landmine directly, and when the landmine falls into the water, the trigger mechanism ignites the fuse.

Just make sure the case is waterproof.

It doesn't even need to be particularly waterproof, just make sure you don't douse the fuse before it explodes.

To be honest, Lu Xuan had already forgotten about landmines before, and his idea was as simple as the others. Landmines are only used for ambushes.

It turned out that Liu Tan unexpectedly came up with such a method.

Of course, Liu Tan is just planning this way, as to whether it can be done, it still depends on Gong Shucan and the others.

Gong Shucan has been worrying about landmines these days. He really wants to take out the finished mines as soon as possible, but the problem is... the trigger of landmines has never been very accurate.

Although the King of the Northern Realm didn't look for him before, he was under a lot of pressure. Now that he heard the King of the Northern Realm called him to come over, Gong Shucan couldn't help but feel a sudden shock in his heart. He was ready to be scolded when he went. Heads ready.

It turned out that his highness not only did not scold him, but comforted him not to be too anxious, and talked about his own needs by the way.

After hearing the latest request from the King of the Northern Territory, Gong Shucan couldn't help but feel refreshed. Isn't it just to make the triggering of the landmines more sluggish, and it doesn't need to be very precise, as long as it doesn't explode during transportation.

Gong Shucan patted his chest and said: "Don't worry, Your Highness, you can do as many ministers as you want, if you can't do it, I will come to see you!"

Liu Tan hastily said, "Not at all."

If he can do it, he can’t do it, so he thinks of other ways. Originally, this matter was suddenly remembered by him. To do scientific research, you should find a place to study quietly. Now let these people follow the army to study while migrating. You can't expect the progress to be fast, not to mention the high precision.

Gong Shucan felt a little ashamed, this was the second task His Royal Highness the King of the Northern Region entrusted to him, and the first task seemed not easy at present, so the second task must not be missed.

After a rough estimate, Gong Shucan proposed that it would take five days.

Liu Tan couldn't help doubting and asked, "Is five days enough?"

Gong Shucan explained: "Your Highness does not want to cause the mountain to collapse, so the gunpowder for each mine will not be too much, and the mines needed will not be too much, five days is enough."

When he was talking, Gong Shucan felt a little sad. Although it was still called a land mine, what this land mine did was not what a land mine should do.

Liu Tan trusted him, nodded and said, "Then go ahead, if you need to report anything."

Gong Shucan left in good spirits, and after he went back and told everyone, everyone heaved a sigh of relief.

Well, it's better not to blame.

It's only five days, which is nothing in a large-scale war. These days, wars are generally based on years, and even the preparation period alone takes many years.

It happened to give the soldiers below a chance to adjust and rest.

He was making preparations here, but King Zuo Tuqi felt that the King of the Northern Realm must be stumped by him, stood in front of the camp and looked into the distance and said, "Hmph, the so-called invincible King of the Northern Realm...is nothing more than that. "

The guards around him also followed his gaze, but... they didn't see anything.

Their sight was blocked by Yanran Mountain.

As the leader, King Zuo Tuqi certainly wouldn't be in the valley, but he did everything he could. As long as he guarded the valley, when winter came, the big man would definitely retreat.

Thinking of this, he also felt a little emotional. Back then, they were not satisfied with the retreat of the big man. They had to kill more soldiers of the other side, or take prisoners.

It's just that no one seems to dare to say that they can get benefits from the king of the north, and they don't even ask to win, as long as they can hold on.

This person... is really wicked.

King Zuo Tuqi counted the time, turned his head and said to the people next to him, "Go back and tell your father that we have already..."

Before he could finish his sentence, he felt a vibration under his feet.

At the moment of shaking, King Zuo Tuqi originally thought it was an earthquake, but when he smelled a special smell of sulfur, he subconsciously looked towards the valley.

Then it was discovered that the valley in the distance had been shrouded in thick smoke.

He somewhat understood this kind of situation, and it usually happened when the powder keg exploded.

King Zuo Tuqi couldn't help but widen his eyes: "This...impossible!"

The guard beside him was also dumbfounded, and he didn't recover for a while.

King Zuo Tuqi's expression suddenly changed, he turned his head and said: "Quickly, withdraw the troops and return to Dragon City!"

Of course he will try his best to delay, but... Facing the opponent's various inconceivable methods, he no longer has the confidence to stop Liu Tan's footsteps, those people in the valley... I'm afraid they can't do it anymore.

King Zuo Tuqi now only hoped that the strong Dragon City could resist the opponent's pace.

Fortunately, the other party did not seem to be in a hurry to catch up.

In fact, it's not that Liu Tan doesn't want to chase, but...there's really no way to chase, after all, no matter how hard it is, the ground after the valley is bombed will be potholed, and this is their only way to Dragon City.

Liu Tan was not in a hurry, they were already very close to Dragon City, so they couldn't be in a hurry at this time, anyway, they didn't expect to destroy the Xiongnu.

Fortunately, this explosion partially filled the puddle dug by King Zuo Tuqi before, otherwise Liu Tan would have to send people to transport all kinds of sand and gravel to fill the pit.

Now he just needs to fill in the rocks blown off from the mountains on both sides.

The main purpose of doing this was to pave the way for the logistics team behind. If it weren't for the fact that he was not sure that he could take down Dragon City and was afraid of making wedding dresses for others, Liu Tan would have sent people to the northern border country to deliver cement.

During this process, the soldiers dragged over the copper plates laid by King Zuo Tuqi before.

Liu Tan went over to take a look, and found that in order to prevent tunneling, King Zuo Tuqi made the copper plates very thick, and they were all very large, roughly dozens of pieces.

After thinking about it, Liu Tan said happily: "I didn't expect to have income, it's not bad."

It's really all money.

Seeing him like this, Lu Xuan couldn't help laughing and crying. The money he got out of this little copper plate was not enough for His Majesty to send it once. As for being so happy?

However, from Liu Tan's point of view, this was a windfall. The imperial court had sent a large amount of food and grass. Liu Tan knew that Chang'an had great expectations for him to take down Dragon City.

Even Liu Tan was under a lot of pressure, and now...he finally got some money back, so at least he could explain something.

While Liu Tan was asking people to fill the road, Lihu Lake was preparing to run away.

After King Zuo Tuqi returned to Longcheng with his people, Xiaolihu was furious when he heard it: "Didn't you swear before that you could stop him!"

King Zuo Tuqi lowered his head and said nothing. In fact, what made Xiaolihu most angry was not that his son didn't stop him, but that his son didn't have the courage to try again after finding out that the first method didn't work.

Xiaolihu suddenly realized that the king of the northern border had reached the point where their people were afraid. It might not be considered frightening, but it really put them under pressure.

Xiaolihu said in a deep voice: "If you can't stop the opponent, Dragon City is at stake, is there anyone willing to fight?"

Wherever his gaze passed, everyone bowed their heads one after another, and he didn't dare to look at Xiaoli Lake at all.

Xiao Lihu's heart sank. He was also a brave and good fighter. Under such circumstances, he knew that if he forced people to fight, he would only waste their foundation for nothing.

At this moment, King You Tuqi glanced at King Zuo Tuqi and said, "Your Majesty, if I don't have my fate today, I might as well retreat to the east."

Xiaolihu's face was livid: "Could it be that Dragon City will be handed over to others?"

King You Tuqi said slowly: "Isn't there King Zuo Tuqi? He made a vow before that if he didn't, he would hand over Dragon City to him and let him guard it."

King Zuo Tuqi turned pale, and looked up at Xiaoli Lake, but before he could say anything, he saw Xiaoli Lake nodded slowly: "Yes."

So when Liu Tan finally arrived at Longcheng unimpeded, the only one who faced him was King Zuo Tuqi.

This news was brought by Lu Xuan, he asked a little strangely: "Where's Kuli Lake?"

Lu Xuan smiled: "I was scared away by you."

Liu Tan:? ? ?The mighty Xiongnu Shanyu, can you stop being so cowardly!