When things go wrong, there must be demons.

In Du Feng's view, the Rakshasas built forts, increased troops, cultivated and even robbed tribes to rob furs, which were all normal things, and were not special circumstances.

However, there is a Kunlun slave among the Rakshasas, and this Kunlun slave who is completely black is still an officer, which is a bit abnormal.

Since it is an anomaly, it is necessary to mention it.

The Bitter Cold, the Russian Fortress, the Negro ...... These keywords are connected in one place, and Liu Yu naturally thought of who this is.

If you're not mistaken, this should be a legend.

He may not be very famous, but he had a good great-grandson named Pushkin...... It is known that Pushkin had black roots, and this is where it originated.

This man was the adopted son of Peter the Great and the godson of the Queen of Poland......

The son of a tribe on the coast of Chad, Africa, he was sold to Constantinople as a slave in Turkey, and was later bought and given to Peter the Great.

Because of his cleverness, Peter was baptized and converted to Orthodoxy as his godfather, the Marquess of Bayreuth of Poland, Queen of Poland.

After that, it was similar to Liu Yu's path, becoming Peter's guard and secretary, which can be regarded as a "guard" in a sense.

He followed Peter to Europe to investigate, because he was smart, proficient in "Western studies", and proficient in Latin and French.

He studied military engineering at the École Nationale de France, served in the French army, and rose to the rank of captain.

He also talked and laughed with Voltaire and others in the Paris salon, and was called the "black eagle" by those Enlightenment scholars.

After returning to China, he was born as a close guard and studied in the West, and served as a brigadier general.

In the end, he became a Russian general, Governor General of Estonia.

With the background of a black man, in the 18th century slave era, he became a "master" with more than 600 white serfs, which must be called a legend. His son commanded the landing of Marines in Greece and was known as the closest Russian general to the liberation of Constantinople.

Listening to Du Feng's mention, Liu Yu also roughly guessed what was going on on the other side. As soon as Peter died, the empress came to power, and he had a grudge against this man, and in history he was relegated to the border to build a fortress on the Sino-Russian border.

It is estimated that the world is similar, and the losers of the Korea-China struggle were thrown to the border.

The black Liu Yu had also seen it in his previous life, and he was not as shocked as Du Feng.

But you have to be careful.

If it's really this guy, it's a big trouble.

This man was a very good fortress engineer, and he had studied in France. Marshal Vauban has a unique and world-leading star castle building technique, and this person is quite the essence.

Historically, he also presided over and participated in the construction of the Kronstadt Fortress and the Ladoga Canal, and the engineering and technical standards are indeed very high.

Historically, this man was exiled to Lake Baikal for court struggles, and presided over the construction of the Selenginsk fortress.

Now, under the changes of history, this person did not go to Baikal to build a fortress, but ran to the bank of the Songhua River, which made Liu Yu's originally tense nerves more sensitive.

Two support points for the Russians at the border.

One is the upper reaches of Lake Baikal and the Heilongjiang River, the south of Lake Baikal runs northward, the north is too cold, and if you want to expand eastward, you can only go to the south shore of Lake Baikal.

The other is Stepanovsk not far from the city of Handori, which is located at the confluence of the Songhua River and the Heilongjiang River, and can be attacked and defended.

If Zhuxia and Kyushu are taken as an analogy, then Stepanovsk opposite the city of Handori is analogous to Jingxiang of the Northern and Southern Dynasties.

If the Northern Dynasty gets Jingxiang, the Jiangnan defense line is equivalent to nothing. Those who got Jingzhou and Xiangyang in the north but did not go down to the south of the Yangtze River did not have it.

The fact that this black engineer ran from Lake Baikal to the banks of the Songhua River illustrates a very important problem.

Originally, in history, the Manchus and Russia fought Yaksa twice, not to mention how they fought, at least let the Russians understand one thing: with their projection capabilities, at least at this time in the Far East can not continue to expand, has reached the limit of national strength and technology can support at this time.

As a result, even though the black man was implicated in the palace struggle, the Russian tsarina and her face were not fully utilized to build the Selenginsk fortress on the shores of Lake Baikal in order to control Buryat Mongolia as an effective eastern frontier.

In this time and space, the battle to test each other's strength has not yet been fought.

The fact that this black man was thrown here instead of Baikal proves only one thing: the Russians believed that it was possible to continue south on the banks of the Heilongjiang River, and not to use Baikal as the eastern frontier of effective rule in the 18th century.

This black man's engineering attainments are really high, very high, and he participated in the construction of St. Petersburg, and he has strong organizational skills and strong relations between the military and China.

Once that fortress is fortified according to the French system and garrisoned with one or two thousand people, it can directly cut off Dashun's control over the lower reaches of the Heilongjiang River and the banks of the Ussuri River.

In this era, there was no French-style star castle with one or two thousand people stationed in it, and there were no twenty or thirty thousand people who could not surround it.

Dashun's delivery capacity can only maintain a maximum of 20,000 people in this kind of place, and the logistics will not be able to bear it any more.

This position is like a castle in Xiangyang, which traps all the mobile forces of Dashun, and if it starts, the initiative will be completely in the hands of the Russians.

Now Dashun wants to fight a dozen in the north, test Russia's strength, and determine the northern frontier; The Russians also seem to have the intention to fight southward, and it seems that they can fight those Jurchen tribes easily, thinking that it is just the same thing to make trouble in the Central Plains, where they almost eat fish in the year of Jiashen......

Liu Yu was a little flustered, stabilized his mind, and asked, "Are you sure this person only came this year?" ”

If it had come before, it would have been a big trouble, and I'm afraid Star Castle would have a slight system.

If this is the case, then we must be prepared to mobilize artillery teams from the capital and mobilize sword and shield sailors from Fujian to besiege them for a long time. Other than that, he couldn't think of any other way to deal with a star-shaped fortress with its back to the river.

Du Feng saw that Liu Yu cared so much about this "Kunlun slave", and thought that he had guessed correctly, could it be that these people came to this strange move of the Rakshasa people this time? Isn't this Kunlun Numo some important figure in the Rakshasa?

He no longer hid his secrets, but said: "Lord Hui, I only came this year." Last year, I also went to the Rakshasa Castle to sell some tea cakes and rhubarb, but I didn't see this person. I came here this fall at the earliest. ”

Hearing this, Liu Yu breathed a sigh of relief.

Autumn comes...... Well.

Heilongjiang has only two seasons, winter and about winter.

Autumn in a theoretical sense is only twenty days around August 15.

As soon as autumn passes, the earth is frozen and cannot be built, even if there are excavators and pile drivers in later generations, they will have to rest obediently in winter, and now they have to rest.

Since it was autumn, it seems that the construction of this fortress has not yet happened, and the time is just right.

Suppose there are three or five hundred people on the opposite side, three or five hundred people defended by professional engineers and French technical star forts, and three or five hundred people defended by an earthen village, which is not the same concept at all.

In particular, that engineer also got the castle attack and defense tactics of Vauban Legend, and once the fortress is completed, it is a nail that cannot be gnawed down at all.

Looking at Du Feng and several other border soldiers who were kneeling on the ground, thinking about the marksmanship of these people who hit the horses with one shot just now, if the border army soldiers all have such a level......

Thinking secretly, Liu Yu had a bold idea in his heart.