Speaking of which, Pargani actually doesn't want to get this kind of ugly "black cauldron" helmet. However, because the mercenary group's business is not good, it is difficult to finance. Originally, the standard helmet of the "Gentleman Mercenary Group" was to make a spearhead on the top of the helmet and insert some feathers. That way, it looks more handsome. Moreover, it is also a popular style in Europe.

Unfortunately, because he had no money, Pargani had no choice but to order an iron helmet with no spearhead on the top of his hat. Because, this saves a lot of money. After all, now helmets are all handmade by blacksmiths. It costs a lot of money to put a spearhead on top of an iron helmet. Only a few officers had eyes open to their heads and could stick some feathers into them. Therefore, Marin saw that the 800 "black cauldron" was purely because the "gentleman mercenary group" was short of money, and the spearhead on the top of the helmet was cut corners. However, this is also more like the steel helmet of later generations. If you wear it on your head, it's actually quite handsome. But on the back......

Marin also realized that in the future, the helmets of his own army must not be dyed in pure black color. Otherwise, it will be like carrying a black pot on your back......

"Well, I don't know if these Italians will survive in the end......" Marin said with some emotion.

After all, it was he who deceived these 10,000 Italian lads to Germany. Moreover, send them to death......

However, Marin still underestimated the cunning of the Italians. Italy has a strong business atmosphere, and ordinary people are more shrewd and profitable than the honest and simple German people. Therefore, compared with the Germans, the Italians are a little calculating and unwilling to suffer.

This quality, when used in business, is an excellent quality. However, when used in the army, it is very unlucky. Because, small businessmen who are calculating are most afraid of losses. And dying in battle is a great loss. As a result, business-minded Italians are often reluctant to sacrifice their lives to fight their enemies. If they see something wrong, they will surrender happily......

In other words, Italians are like the kind of city people and clever people that Qi Jiguang refused. Such people can easily flee for their lives on the battlefield in order to protect themselves, which can lead to the rout of the army.

The Germans, on the other hand, have a somewhat honest and upright character. Such a person is the most suitable to be a soldier. Because, even in the face of difficulties, those honest German soldiers would persevere, and were not accustomed to opportunistic shortcuts.

So, Marin's worries about the Italian mercenaries were unnecessary. Because, in the face of adversity, this group of "smart" Italian mercenaries will choose to surrender and will not be stupid and desperate......

……

Of course, the Italian mercenaries would not have surrendered casually until they showed their defeat. After all, people are lucky, especially those who think they are clever - perhaps...... If...... Can you win......

Therefore, before despair, the Italian mercenaries will not easily admit it. Only when you can't beat it will you give up.

In addition, as a famous Italian "often defeated general", in fact, Pargani also has a magical talent - escape......

After all, on the battlefield, it is also a skill to survive after losing and not be captured. And Pargani is precisely the best at escaping. Moreover, he fled for his life with his subordinates.

Pargani is not good at finding fighters, so it is difficult to win battles. However, he has a talent for catching the enemy's weak points when he is defeated and fleeing with his men......

Therefore, even though he often lost battles, because of this skill, there were still many Italian mercenaries who were willing to follow him. After all, when Pargani fled for his life, he took his brothers with him and did not abandon his men casually. And the leader of the mercenaries who only cares about his own life and escapes, as long as he does this a few times, no one will follow him anymore......

……

From Aurich to the city of Oldenburg, it is only seventy or eighty kilometers away. Therefore, although the Italian mercenaries did not march fast, they would still arrive first by the Eight-Nation Alliance. Because, the alliance of the princes of the eight countries had just arrived in the city of Osnabrück at this time. As is customary, coalition forces entered the city and ransacked it. Because they were busy with looting, the coalition army would definitely not be able to march fast.

Therefore, Marin was not in the slightest worried that the Italian mercenaries would arrive in Oldenburg later than the allied forces of the Eight-Nation Princes.

Moreover, Marin still had a back hand - 2000 Cossack cavalry, which had already lurked halfway from Osnabrück to Oldenburg.

If the combined army of the Eight-Nation Princes marches slowly, these 4 Cossack cavalry regiments will be ignored. But if the coalition forces speed up the pace, then the Cossack cavalry will take the initiative to harass and harass the other side, not confronting the other side head-on, just to delay the other side's march. In this way, it was possible to ensure that the Italian mercenaries arrived in Oldenburg first.

And Marin's arrangement really worked - a squadron of light cavalry with a size of 200 people sent by the coalition of the princes of the Eight Kingdoms was easily wiped out by the Cossack cavalry regiment.

This move really caused panic among the allied forces of the princes of the eight countries, and various countries sent scout cavalry to inquire about the news. However, by this time the Cossack cavalry had long since run away, and they were running away at night.

Because the Cossack cavalry did not let go of a single enemy cavalry, the princes of the Eight Kingdoms were a little uneasy. In this way, they are more cautious. The march, which was already slow, was slowed even lower. A few days later, because they found that everything was fine, the coalition forces continued north. At this time, the Italian mercenaries had already entered the city of Oldenburg and were deployed in their way......

……

And at this time, what is our traverser Marin doing? Alchemy...... No, it's really engaged in chemical production......

The things that Marin produced this time are a bit of a bombardment. Because, it has a very bullish name - aqua regia!

Yes, the aqua regia that dissolves gold and silver!

Of course, Marlin didn't want to use aqua regia to dissolve gold and silver or engage in wet alchemy. He engaged in Wang Shui in order to deal with the big iron gate in the capital of the princes of the Eight Kingdoms......

As long as Marin "makes a comeback", he will definitely quickly beat back the alliance of the princes of the eight countries. However, it was not easy to destroy the eight vassal states.

Those little Boguo are okay, they are relatively easy to fight. Among the eight vassal states, the financially powerful Duchy of Braunschweig-Wolfenbitel and the Duchy of Braunschweig-Lüneburg were all replaced with large iron gates that could not be bombarded by artillery. Even Gerddon, the capital of the kingdom of Gerdon, is surrounded by four large iron gates. Of course, when the Gerdon Count was still the Duchy of Gedes, it was built because of its abundant financial resources. As for the other minor states, including the modest Saxony-Lauenburg Duchy, the capital is still oak gates......

For the oak gates, Marin had already prepared - burning the gates with gasoline......

During Marin's absence, Kohler's men did not stop buying oil from the Vistula Valley in Galicia, Poland. Two years, but a lot of barrels have been saved.

Before making a move on aqua regia, Marin first extracted 30 barrels of gasoline. Then, according to the old rules, red dye is deliberately put in, and something that smells bad is added, so that people can't ask where it came from.

In this way, as long as you attack those cities whose gates are oak gates, you can directly burn the gates with gasoline. Then, when the door burned out, someone was sent to blast it......

……

But for the steel gates, it's not good. However, if sulfuric acid is used, the reaction speed of dilute sulfuric acid is slow, and concentrated sulfuric acid is easy to react with iron to form a thin film, causing the reaction to stop.

Therefore, it is better to use hydrochloric acid. But Marin suddenly remembered - if there was hydrochloric acid, why not just prepare the fastest reaction aqua regia and use it to corrode the steel gates? After all, aqua regia is a mixture of concentrated hydrochloric acid and concentrated nitric acid.

Concentrated nitric acid marlin has long been made, that is, it reacts with concentrated sulfuric acid and saltpeter to obtain nitric acid. It is not difficult to prepare hydrochloric acid, and it is directly heated with concentrated sulfuric acid and table salt.

So, when Marin was idle and bored, while others were busy fighting, he was refining hydrochloric acid and preparing aqua regia in the laboratory......

……

After the aqua regia was configured, it was really powerful. But during the test to destroy the iron gate, there was a big accident - the soldier who used it was poisoned......

It turns out that the nitric acid in aqua regia reacts with iron to form a toxic nitric oxide gas that can cause fainting. The soldier using the glass container containing aqua regia was leaning against the iron gate with the container. As a result, the nitric oxide gas floated up, and the soldier was directly unconscious after inhaling the poison gas. Then, the glass in his hand fell to the ground and poured directly on the surface of his feet...... Then, the soldier's right foot was severely corroded and burned, and although he survived, his right foot was crippled......

……

"This ...... Using aqua regia is so dangerous, it seems that you have to get a gas mask......" Marin was dumbfounded...... Fortunately, he didn't do it himself this time, otherwise, he would be the crippled......

"Dangerous goods are really not so fun, no wonder the country strictly controls these things in later generations...... "If aqua regia splashes on people's faces, it is much more serious than splashing sulfuric acid...... After all, aqua regia is the legendary "corpse water......