Naresh glanced at the Polish prince Poniawski who was being held hostage, and his face was slightly unhappy.
But seeing that Sophia didn't say anything, he tolerated it.
Poniawski said: "I have been to Longyan, and everyone there, whether soldiers or civilians, have been vaccinated with something called a vaccine."
"It is said that this vaccine was personally promoted by Long Yan's chief assistant, Mr. Liu Zheng."
"vaccine?"
"Yes!" Poniavsky said with great certainty: "It is vaccination with variolation. We have used this technology a long time ago."
Seeing Sophia's confusion, Dolgoruky explained: "Your Majesty, we already had this vaccination method centuries ago, and it can indeed immunize against smallpox."
"But people who are vaccinated may pay for it with their lives. Peter the Great once implemented it but ended in failure."
Hearing this, Sophia hesitated. She looked at Poniavsky and asked, "What's so special about Longyan's vaccine? Why does Liu Zheng dare to promote it on such a large scale?"
Poniavsky said helplessly: "I'm sorry, Your Majesty, I don't know that either."
Sophia's guarding gaze fell into hesitation. Smallpox had spread in Tsarist Russia. If she, the newly appointed queen, did not solve this problem quickly, she would face criticism from the people.
Moreover, the spread of smallpox has affected the labor force in Tsarist Russia. Until now, Tsarist Russia was still a serfdom society. The large number of people who died will drastically reduce the labor force.
The reduction in production on landowners' estates will lead to a greater food crisis.
After thinking of this, Sophia made a decision: "Duke Naresh, can you send an envoy to Dragon Flame? We need their vaccine."
"Take the remains of those Longyan soldiers to express our friendship."
"Yes, I will obey your wishes."
…
At this time, Long Yan was about to go on a mission far away from Naresh.
More than a month has passed since the funeral of Louis XV, and Liu Zheng's visit to Europe has come to an end for the time being.
Long Yan gained control of the complete Saxony region and part of the Hanover region in the Paris Contract.
However, the Hanover area was left there because Frederick II asked the Longyan Army to continue to hold on.
It's not Liu Zheng's wish, but for Liu Zheng, this can be considered a good thing.
Hanover's geographical location is also very important and can directly threaten France.
It is also connected to Saxony. From the strategic location, Long Yan's military influence in Europe has greatly increased.
On the other hand, the cost of their garrison in Hannover was borne by Prussia. Why would they not do such a thing that could achieve multiple goals with one stone?
In America, Long Yan harvested a huge area and obtained the ownership of oil in the Americas.
This is the most exciting thing for Liu Zheng. Long Yan's internal combustion engine has entered the final stage and will be put into use soon.
Fuel is the top priority, ever since Long Yan mined oil on that unknown island.
The production and operation of internal combustion engines have only gradually entered reality.
After coming to Longyan, he went to Liangzhou almost non-stop.
There was one thing that he urgently needed to complete as soon as possible!
He came to the secret assembly factory and experimental site of Liangzhou Laboratory.
This is Longyan's experimental base with the best security level.
The standing Long Yan Army alone has a total of 100,000 people, and is even equipped with extremely advanced artillery.
It can attack enemies up to five hundred meters away. Even if the opponent can fly into the sky, it will still be attacked by Dragon Flame's weapons.
Surrounded by mountains, it is easy to defend but difficult to attack.
Even Liu Zheng needed several procedures to enter. After several procedures, Liu Zheng arrived at the experimental base.
He looked at the trapezoidal machine being debugged on the field, and his heart was filled with excitement.
Liu Zheng drew the design drawings several years ago, but he was never able to turn his ideas into reality.
At that time, technology was limited and the internal combustion engine was not developed enough.
But now that the most critical fuel problem of the internal combustion engine has been solved, everything will no longer be a problem!
"Dear Sir Liu Zheng, you are here. We have good news that we need to tell you now."
"We have built a model of the tank you describe and successfully drove it for three minutes with an internal combustion engine."
Hearing this, Liu Zheng nodded, unable to hide the joy in his eyes: "With the armor of a supply ship, it will definitely be difficult to control the weight."
"The current internal combustion engine does not have such a large driving capability and must be further strengthened. Let me see the model you have produced."
The research experts moved out of the way, and Liu Zheng saw these large armored machines behind them.
It looks like a trapezoid, but it is indeed assembled from two upper and lower parts. The lower part has crawlers at both ends. From the outside, it is not difficult to see how delicate the parts are inside these crawlers.
The upper end of it is a large cannon barrel, equipped with extremely powerful firepower.
In the memory of his previous life, Liu Zheng still remembered this kind of war weapon.
He is an invincible land warship capable of crushing enemy forces on the battlefield.
No attack can harm it.
Its existence rewrote the history of war!
In a previous life, people called this weapon - a tank!
Tank is a heavy-sounding name.
A weapon with crushing attack power!
In an era without tanks, heavy cavalry was the only thing capable of sweeping the battlefield.
In the past, densely wooded jungles were the best fighting locations, but due to the emergence of tanks, these trees could not stop the march of tanks at all.
In Liu Zheng's memory, when Desan launched an attack on France and broke through the impenetrable Maginot Line they built, he used tanks.
The Jungle Offensive of the Maginot Line was never built.
This jungle was considered an absolutely impossible line of defense at the time. History has proven to the French countless times that this jungle cannot be broken.
But they completely underestimated Desan's tanks.
These tanks are facing jungle defenses that have grown for hundreds of years and have never been able to be shaken by an army.
Tanks, a new type of weapon, can crush them directly and forcefully carve out a path through this impenetrable jungle.
The so-called impregnable Maginot Line did not even last three months before it completely collapsed.
All this happened because of the invention of the tank.
Thanks to the development of the internal combustion engine, tanks, a super-destructive weapon, will eventually come out!
When Liu Zheng thought of this, a smile appeared on his lips. With tanks, he would no longer have anything to fear when fighting on land.
However, for Liu Zheng, this is not the most important thing.
After the tank is developed, he wants to spread the internal combustion engine to the entire world!
Let the automobile come out. This fast and convenient means of transportation will replace horse-drawn carriages in the future, and at the same time, it will also promote oil, an extremely important strategic resource, to the world.
By then, oil's interests will be crucial.
Now Long Yan has controlled almost all oil resources except Europe, Africa, and South America.
The purpose of the current war is to obtain a larger territory and obtain more resources from above.
Oil will be a vital resource in the future, and it is now firmly controlled by Long Yan.
