Although Marin was not allowed to use force against Bremen, it limited Marin's play. However, to deal with a force in his own territory, Marin should not have too many means.

At the end of the day, Bremen is just a river port city. The seaport of Bremen in Bremen was not built until 1827 in the 19th century, and the first phase was completed in 1830.

The reason why the port of Bremerhaven was built was because in the 19th century, like the Yellow River, the Weser River became shallow due to siltation, which affected the navigation of ships. In addition, the merchant ships of the 19th century were much larger than those of this era, and the requirements for shipping lanes were different. In the 19th century, the displacement of maritime merchant ships began to be more than 1,000 tons, or even several thousand tons. The Weser River was no longer sufficient for the navigation channel, and the siltation of the river meant that a harbour had to be trimmed.

But in this era, the mainstream merchant ships in Europe were only about 200 tons. As the second longest river in Germany in later generations (the Danube and the Rhine are transnational rivers and are not in the ranking), the Weser River was fully suitable for merchant navigation in this era.

Moreover, the advantages of inland ports in this era are even greater. Not to mention anything else, the mere fact that the berthing ships in the inland port do not worry about maggots is incomparable to that of a pure seaport. The big ports of this era were basically inland ports, or ports of freshwater estuaries. London, for example, is the river port of the River Thames. Hamburg and Bremen are also river ports, of course, Hamburg has a Cuxport, but also at the mouth of the Elbe. Lübeck is also an inland port, as is Seville, a famous port in Spain......

Inland ports are not afraid of maggots encroaching on the bottom of ships, nor are they afraid of coastal storms ravaging the ports. But if someone blocks the estuary......

That's what Marin did, you won't let me attack Bremen City, will you? No problem, I'll just block the mouth of the Weser River......

However, the direct blockade of the Weser River seems to be too strong and domineering. After all, you have to pay attention to the teacher to be famous. Therefore, we have to find a way to make the people of Bremen have a word of suffering.

This question may be a difficult problem for people in this era. But for Marin the Traverser, it was a piece of cake. It's just to embarrass a "household" in their own country, and the demolition and relocation office of later generations is an outstanding representative of the difficult household......

Nail household, huh? I don't beat you, I don't scold you. I'm cutting off water and electricity, and I'm digging up your way out of the house, in the name of repairs...... See if you crash or not......

Marin did the same thing, Bremen, right? Inland ports, right? Sorry, because of the siltation of the Weser River, the wise leader of the Beihai Kingdom, Grand Duke Marin, decided to urgently meet the needs of the people, and organized the whole Beihai Kingdom to unite as one to carry out centralized dredging work on the sediment-stagnant Weser River......

During the dredging period, the Weser River channel was temporarily closed. Closure time...... One year ......

……

Marin sent someone to Bremen City to put up a notice, and then, in earnest, began to de-dredging in earnest......

It wasn't a whim, it wasn't to deal with the city of Bremen, but Marin genuinely intended to carry out a dredging.

The Weser River is highly developed because of the presence of the Hanseatic city of Bremen. However, the degree of development is very high, which naturally brings the problem of soil erosion. The vegetation along the river has been extensively damaged due to frequent human activities. Without vegetation, soil erosion is naturally serious.

Of course, the problem of the Weser River is not very obvious at the moment, but there are some signs of it. Marin intends to stifle this sign in advance and clean up the Weser River in advance.

On the one hand, Marin intends to organize the population and dig up the silt at the bottom of the Weser River. On the other hand, Marin considered introducing weeping willows from the Ming Dynasty and planting them on river embankments to conserve water and soil.

The method of digging the silt is very simple, that is, using a very long wooden stick attached to an iron bucket. Armed with long wooden sticks, people stretched iron buckets to the bottom of the river to dig up the silt. Then, pile it up in the cabin first. After docking, it is transported ashore and scattered into the fields......

Silt is a fertile soil, as some algae crops grow on the bottom of the river. When these algae die, they settle on the bottom of the river and decay, making the river mud fertile. In addition, there are not only algae in the river, but also many fish that feed on algae. After the death of these fish, the carcass naturally sinks to the bottom. Fish are rich in phosphorus, and the carcasses of fish are mixed with the silt, which makes the sludge contain phosphorus, which can be an important auxiliary fertilizer. Of course, there is also fish feces, which contain both phosphorus and nitrogen.

In later generations, there was an agricultural technique called rice and fish farming. It relies on the feces and bones of fish in the rice fields, which are important natural fertilizers for the rice fields.

In addition to cleaning up the waterway, Ma Lin's organization of dredging this time is actually an act of fertilizing fields. After all, sludge is a natural fertilizer. In the Ming Dynasty, Jiangnan people liked to dig up silt and fertilize the fields. In addition, because rice is often introduced into the river. The dissolved nitrogen and phosphorus components in the river water also fertilize the rice. Therefore, the rice yield in the south of the Yangtze River is high, and it is the granary of the Ming Dynasty.

Of course, not all silt can fertilize the field. In the future, you will try the sludge polluted by the sewage discharged from the chemical plant? You have to kill the seedlings. Also, the silt of the Yellow River is not very useful, most of it is sediment......

As for planting willow berms by the river, it was an important measure in ancient China and had a very long history. First published in Tube. There is a record of planting willows on the river embankment in "Degree of Land" - "Plant thorns to strengthen the land; mixed with poplar (willow) to prepare for the water".

Therefore, since the Spring and Autumn Period and the Warring States Period, the ancient Chinese people knew how to plant willow berms. Therefore, under the deliberate influence of the official, there were many weeping willows by the ancient Huaxia River.

Why was there a custom of folding willows to send them off in ancient times? If you send it to a friend, you naturally have to send it outside the city. And the moat outside the city is full of weeping willows, and it is natural to be unhappy to say goodbye to friends. As soon as the baby is unhappy, he will be angry. Hey? There's a weeping willow here, so I'm going to get angry with it...... Then, the baby broke a willow branch and was in a much better mood......

Friends are strange - good friends, why do you pinch other people's willow branches? Did the willow provoke you? This must not tell the truth, otherwise it will seem a bit lo than ...... So the baby's heart moved, and he gave the willow branch to his friend...... You see, this is the willow branch of your hometown, a good friend, bring the willow branch of your hometown, and see the willow branch as if you have seen your hometown, if you have seen me, your good friend......

Then, this saying spread, and there was a custom of "folding willows to say goodbye......

The reason why the willows are broken is really because the moat outside the city has been arranged by the government to plant willow trees. If you want to fold anything else, you can't fold it. Also, the branches of other trees are too high, and you have to work lightly if you want to break them...... Don't want to weep willows, willow branches hang down and let you break ......

……

Planting willow berms, in addition to the roots of willow trees can stabilize the soil, is also related to the tenacious vitality of willows. In the spring, if you just plant a willow branch on the moist ground by the river, you can grow a big tree. Even, when the spring breeze blows, the catkins fly away and fly to a moist land, and willow trees can grow...... Unlike other trees, it is very difficult to cultivate, and the trouble is dead. Therefore, the willow tree became the first tree of the berm in ancient China.

However, it seems that in the Ming and Qing dynasties, the willow trees on the river embankment were destroyed on a large scale. The reason for this is speechless - to make gunpowder...... During the Ming and Qing dynasties, most of the charcoal in the gunpowder formula was willow charcoal. So, the willow trees were destroyed on a large scale and were used to burn willow charcoal......

Marin wanted to use willow berms because of the ease with which willows can survive and spread. Also, willow bark appears to contain salicylic acid. Legend has it that aspirin, a miracle drug later developed in Germany, was originally extracted from the bark of willow trees transplanted by Europeans from Asia. Later, of course, it was synthesized. But the first discovery and research of aspirin began with willow bark.

I don't understand how to synthesize salicylic acid into the miracle drug aspirin marin, after all, I don't study chemistry professionally. However, he can get those children who study chemistry to specialize in salicylic acid extracted from willow bark in the future. In this way, from generation to generation, one day aspirin will be made.

……

The city of Bremen reacted violently to Marin's blockade of the Weser River. However, Marin didn't care at all how they reacted.

While deploying a group of troops around the city of Bremen, Marin also set up artillery on both sides of the Weser River. If the merchant ship of Lai May did not dare to break through, it would be sunk directly.

The people of Bremen were furious at Marin's near-scoundrel behavior. But they couldn't defeat the Beihai Kingdom, so they could only choose to ask for help from abroad...... Unfortunately, the city of Bremen is not a sovereign city. Even if they wanted to appeal to the Imperial Diet, they were not eligible. As for asking for help from the Hanseatic League, the Hanseatic leader Lübeck and the vice-leader Hamburg were silent......

So, the Bremen people understood - they were abandoned......