The map surveying and mapping of Beihai Kingdom is different from surveyors in other countries in this era. For example, Marin introduced the contour marking method that appeared in the 18th century. In this way, the map is more intuitive and provides more detailed information to the army commanders.

In this era, because there is no contour marking technology, maps of other countries can only mark the difference between plains, rivers and mountains. However, it is not clear how high the mountain is. At most, it is accompanied by some simple introductions. For example, this mountain is very high, this mountain is not high or short, this mountain is very short... But how high it depends on the officer in the picture to use his imagination. If the imagination is wrong, it will be over...

However, because it was infiltrating other countries to survey and map. Therefore, many large surveying and mapping instruments invented by Beihai Kingdom cannot be carried. Even if they are taken over, they cannot be used. In this way, the spy gate can only carry some small surveying and mapping equipment such as short rulers and protractors. For example, when measuring the height of the hillside, you can only measure the height of the mountain through the flagpole shadow method. Of course, the slope of the hillside will also be marked. This is very important, and it is related to whether you can send troops to rush up.

In addition, because it is in deep surveying and mapping in other countries, the altitude of the hillside is not the altitude measured, but the altitude of the relative flat ground. To measure the altitude, you need to measure the atmospheric pressure, and also calculate the gravity acceleration. Although Marin provides a lot of data, the details of the gravity acceleration are not possible, and he cannot give particularly accurate numbers. Therefore, sometimes there will be considerable errors in the calculation, resulting in an altitude calculation error.

However, in marching and fighting, absolute altitude is not very important. Military maps mainly consider the impact of terrain differences on military marching. Therefore, spies only need to use simple and easy-to-carry measurement tools to measure the height of the hillside relative to the original.

Then, draw the contour lines, mark the slope angle of the hillside and whether it is suitable for rushing up the mountain, etc. Of course, whether the mountain is a stone mountain or a earth mountain must also be marked. Because earth mountain can be blown up, and stone mountain is difficult.

In addition, the depth of the river is also an important surveying project. After all, Marin thought of using ships to transport grain and grass deep into the inland. Also, the wind direction and wind power in the river area, as well as the seasonality of the wind. After all, the ships of this era were mainly sailboats. This requires long-term observation and introductions from locals. However, directly asking locals about such professional questions will be suspected of their motivation. Therefore, they can only ask around the bush.

In addition to the information of wind, in Russia, the frozen world on the river must also be clearly understood. If the world is wrong and the huge fleet is frozen on the river surface, it will be miserable. In Russia, there are several months of winter, and the ship is frozen in the river, which is simply the target of the Moscow people.

It is obvious that Napoleon's army did not take into account these details carefully, which led to a loss. Because of the experience and lessons of the failure of the two bigwigs, Napoleon and the Bearded, Marin did not dare to relax at all.

Moreover, Marin did not think of occupying this place for a long time. The main reason is that the defeat of the two powerful men, Napoleon and the Bearded, is so scary. Therefore, despite being jealous of the extremely large population and resources of the Grand Principal of Moscow, Marin did not dare to have the idea of ​​occupying and controlling the Grand Principal of Moscow in full. It is not that he could not defeat the Moscow army, but that he could not defeat the weather...

Therefore, Marin could only have the idea of ​​looting the population for Moscow, rather than directly annexing. Moreover, even if he really wanted to annex, it was not the time to do so. At least, before annexing England and solving the threats from the French and domestic princes, Marin did not have the ability to covet there.

...

However, how to send spies to infiltrate the country of the Grand Duke of Moscow, Marin summoned Kohler and Kohler's intelligence officials to discuss.

But the Grand Duchy of Moscow is too far away, and everyone is probably not as familiar with it there as Marin. At the beginning, Marin planned to send someone to sell wine in the Grand Duchy of Moscow. After all, Maozi is very good at liquor, which is world-famous.

However, intelligence officials said that this idea is fine, but it can only work in urban areas. Because, in the vast rural areas of the Grand Principal of Moscow, people do not like to drink strong alcohol, but they cannot afford it.

If you take Erguotou, they can only be envious. Or, just draw their swords to rob. Because they have no money...

Not to mention those serfs, even the rich families in ordinary small villages are relatively poor. According to the information fed back by some spies sent to the Grand Principal of Moscow, the lives of the rich families in many remote areas of the Grand Principal of Moscow may not be as good as the serfs in the manors under Marin's name.

The serfs in the manor under Marin's name were all black bread enough. The proportion of rye flour in bread was very high, and almost no grass bran could be seen. At this time, the rich families in the remote areas of the Grand Principal of Moscow had a high proportion of black bread and wild vegetables. In other words, there were a lot of wild vegetables in the forests in Eastern Europe, so there was no need to worry about not having them. In addition, they could still get some wild game occasionally, so they could still get by.

But a very strange phenomenon in the Grand Principal of Moscow in this era is that there are many wild animals there, but people lack weapons to deal with wild animals.

Due to backward production technology, the farmers in the Grand Principal of Moscow had a serious shortage of iron farm tools, let alone iron weapons.

It is said that in this era, the salt prices in Eastern Europe were high. In fact, iron tools were the most expensive commodities in the Ross region in this era. Their prices were more expensive than salt.

In later generations, Russia seemed to have abundant minerals and was not short of coal and iron at all. But in fact, in this era, the Grand Principality of Moscow was short of coal and iron.

For example, the Kursk region, which was rich in coal and iron resources in later generations, is still a border area with the Crimean Khanate. Even if coal and iron resources are discovered and steel industry is developed, it will be stolen by the arrogant Crimean Khanate. Because the Crimeans are also short of iron!

This chapter is not over, please click on the next page to continue reading! As for the Ural coal-iron-iron production area, it is still the territory of the Kazan Khanate and the Siberian Khanate at this time. Even if the Grand Duchy of Moscow knows that there is coal and iron there, there is no way. What's more, they don't know now.

So, the embarrassing thing is that the current iron tools in the Grand Principal of Moscow depend on imports and are expensive. Even if there are many wild animals in the country, they do not have enough weapons to hunt. In particular, the people lack iron weapons to deal with wild animals.

Even if Vasily III wanted to attack Smolensk and lacked weapons, he would entrust the Teutonic Kingdom to help purchase in Western Europe.

Of course, it cannot be said that the people do not have the ability to hunt wild animals. Generally, hunters can use traps to hunt wild animals. In addition, even the arrows made of stone tools can hunt small animals and larger deer.

However, animals with thick skin and flesh, such as wild boars and bears, will never dare to provoke them. Unless these thick skinned beasts fall into the trap, ordinary people will not dare to make up their minds.

In fact, the first group of spies sent to the Grand Principal of Moscow suggested selling combs to villages of the Grand Principal of Moscow. In this way, these hunters could easily deal with beasts such as bears, wild boars and wild wolves. Then, after selling combs and ammunition at high prices, they could also purchase animal fur from local hunters who purchased combs at low prices.

It can be said that this is a great business that kills two birds with one stone! But Marin still rejected it directly. Why? Because Marin was worried that these coercion guns would fall into the hands of the official Duchy of Moscow. After all, it was just a matter of one sentence to confiscate the hunters' coercion guns with the order of the Grand Duke.

If those excellent comb-rope guns made by the North Sea Kingdom are obtained by the army of the Grand Duchy of Moscow, they may harm the army led by Marin in the future. Perhaps, Marin himself, who led the troops himself, will suffer a loss.

Therefore, Marin would rather not do this profitable good business, nor would he cause trouble for his future military operations.

However, if you have business, you must not do it. Moreover, only with good business projects can you successfully send spies into the territory of the Grand Duchy of Moscow in the name of merchants.

The merchants who bought furs had a very reasonable identity. But the ordinary people in the Grand Duchy of Moscow lacked weapons to deal with beasts. What should I do if I change it? I can’t sell a mud rope gun to them. Could it be that I would sell a bow and crossbow?

Marin thought about it and gave up. After all, the powerful crossbows in this era are actually no worse than muskets. In many aspects, they are even stronger than muskets. And if it is a crossbow that can shoot bears and wild boars, it can also pose a huge threat to the soldiers of the North Sea...

Muskets and crossbows are not good either. Do you really want Moscow hunters to take risks with stone weapons? Others have to be happy... Moreover, if they catch wild beasts with traps, they may not necessarily sell them to you...

After thinking about it, Marin suddenly remembered a video I saw in his previous life, which was a video of African black uncles hunting elephants with javelins...

The black uncles used the original javelin to tie the thick-skinned elephants into hedgehogs, which was extremely spectacular. Elephants with such thick skin were not low in javelins, and bears and wild boars would not be spared. Besides, they were iron javelins. Moreover, for the army, those javelins were not threatened. Because, Marin remembered that in the book of the previous life, the range of heavy javelins was about 27 meters. The range of light javelins was 50 meters. For this short-range weapon, even if it was taken away by the official of the Grand Duchy of Moscow, it would not be a threat. After all, let alone bullets, even ordinary bows and arrows could torture the javelins.

Therefore, intelligence officials such as Marin and Kohler formulated plans to send spies to pretend to be fur merchants and go deep into the heart of the Grand Principal of Moscow, and while purchasing fur, they promoted the iron gun heads of heavy javelins.
Chapter completed!