The Rise of the European Emperor

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In addition to the reason that even if a small hole is corroded, it may not be able to blow up the iron city gate, there is another important reason - with the reaction speed of the whole iron city gate and dilute sulfuric acid, it is estimated that it will take several days to corrode the hole. . And for such a long time, the defenders in the city will definitely be able to respond accordingly.

Moreover, such a long corrosion time, in addition to the fact that the defenders in the city may not give you time to slowly corrode, it is also easy to leak secrets, which is also a very important issue.

In this era, strong acid can corrode steel, which is not a common chemical knowledge that everyone knows. Because modern chemistry has not yet emerged, and European chemistry is still in the ignorant and backward stage of alchemists. Even if many alchemists can produce dilute sulfuric acid, they still don't understand the chemical principle.

In the future, Marin still wants to rely on the gate covered with white iron to defend against the enemy's attack. How can he expose the chemical knowledge that dilute sulfuric acid can corrode the big iron gate in public?

In fact, if it is replaced by aqua regia, which is extremely effective, it will meet Marin's requirements. Aqua regia splashed on the iron city gate can corrode large holes in a few minutes. If the amount is enough, it is not impossible to corrode the entire city gate.

But the problem is that aqua regia is made up of concentrated hydrochloric acid and concentrated nitric acid in a ratio of three to one. Marin has now mastered the production methods of concentrated sulfuric acid and concentrated nitric acid, but the production method of concentrated hydrochloric acid has not yet been mastered. Although concentrated sulfuric acid and salt are heated, hydrogen chloride gas can be obtained, and hydrochloric acid can be obtained by collecting it with water. However, this yields only dilute hydrochloric acid. It is not that simple to obtain concentrated hydrochloric acid.

Because both hydrochloric acid and nitric acid are volatile acids, unlike sulfuric acid, concentrated sulfuric acid can be purified by heating. If dilute hydrochloric acid is heated, hydrogen chloride gas may volatilize before water...

Therefore, concentrated hydrochloric acid is more difficult to prepare, and aqua regia is also difficult to obtain. Even if Marin can develop aqua regia, it will probably take a long time. By then, the daylilies would have been cold...

...

Marin began to think hard about the countermeasures. Regarding the problem that the dilute sulfuric acid was easy to flow down after pouring it on the iron door, after thinking about it, Marin got a solution—that is, use a brush to paint the dilute sulfuric acid on the iron door like paint Up... In this way, the possibility of going down is reduced...

In order to enhance the viscosity and prevent the dilute sulfuric acid from flowing down quickly, Marin even made people mix some special ingredients into the dilute sulfuric acid, which increased the viscosity of the dilute sulfuric acid and made it less easy to flow down the iron gate. As long as dilute sulfuric acid adheres to the iron door for a long time, the reaction time is long enough, it is definitely better than flowing to the ground soon...

As for the problem that brushes are easily corroded by sulfuric acid, this is very simple-prepare more brushes...

But,

Even if there is a small hole corroded on the iron door, the big problem that it may not be able to explode if you put it in a gunpowder barrel, there is still no way to solve it...

...

After Marin tried to pour the waste water of the mixed solution of paint ingredients and dilute sulfuric acid into a waste ditch, he suddenly asked:

"By the way, take a closer look and see where the outlet of the drainage ditch in Siena City is. There must be a drainage ditch in Siena City, right? Look for it!"

After asking this sentence, Marin suddenly remembered that in many movies of later generations, it seems that many spies and assassins sneaked into the city or mansion through the sewers. Maybe, it can be done through this... The Iron City Gate is difficult to deal with. Could it be that the sewer exit is also an iron gate?

...

It really made Marin guess right-the sewer exit of Siena City is indeed an iron gate, and it is very thick...

After careful investigation, Marin's special forces soldiers discovered that there was indeed a sewer exit in Siena City, just near the northeast gate.

Of course, the smell of sewers is really bad. Therefore, the exit of the sewer is a short distance away from the northeast city gate, so that the stench of the sewer will not affect the defenders at the top of the city.

However, because the whole city has three gaps in the northwest, due south and northeast. Therefore, the sewer exit is not too far from the northeast gate.

However, the architect who designed the city was very clever, using a small river ditch outside the unremarkable city gate as the outlet of the sewer. Even, the superb architects added a "cover" (that is, laid a layer of bricks to cover the roof) above the sewer outlet near the river ditch and the northeast gate, which perfectly covered the sewer outlet. If you don't peel off the brick cover, you will never think that this is the sewer exit of Siena City.

Marin's special forces soldiers also judged that this was the sewer exit of Siena City based on the unpleasant smell. After all, the sewer outlet must smell bad...

But after removing the brick cover, the soldiers of the special forces were also dumbfounded - because there is also an iron gate at the exit of the sewer...

This iron gate is very small, less than 1 meter high, and looks more like a bigger dog hole. But in order not to affect the outward discharge of sewage in the city, this iron gate is not completely closed, but a large iron gate similar to the steel structure of later generations.

In the middle of the night, Marin put on a mask himself and went to investigate. In the end, Marin came to a conclusion-although the reinforced iron gate of the sewer exit is extremely strong, it is much easier to deal with than the authentic large iron gate of the city gate.

Of course, this iron dog hole door cannot be removed with great fanfare. This dog hole door, even if the reinforced door is broken, it will be difficult for Marin's soldiers to enter the city through this big dog hole less than one meter high. Because this dog hole is too small, if the enemy army in the city finds that someone has broken in from here, they can easily defend this dog hole by sending a small team. Because this hole is too small, a large group of people can't rush in at all. Even if the iron gate is smashed open, they can only climb in one by one. And in the process of climbing in, the other party only needs to send a few people to wait inside the dog hole with knives, and chop off as soon as they come, and the problem can be easily solved...

...

Therefore, even if Marin knew that removing the iron gate of this dog hole could send people into the city, he couldn't let people do it with great fanfare. Because, once discovered by the enemy, it is very easy for the opponent to defend...

Unless... unless the iron gate of the dog hole at the exit of the sewer can be destroyed without anyone noticing, and then quietly send someone into that "dog hole", the effect can be achieved. The main thing is to let a few "violent generals" get in first, and then block the enemy troops who come to counterattack, and provide protection for the follow-up troops to enter...

It is worth noting that although the defenders in the city sometimes send people to pay attention to the exit of the sewer, there are no defenders who will guard the side of this "dog hole"...

why? Because this is the sewer outlet, it smells bad. Which soldier is willing to stand by the sewer exit at all times?

Therefore, even the soldiers guarding the exit of this sewer are still standing at the foot of the city wall more than ten meters away, looking at this side from time to time, and no defenders are willing to stand guarding this smelly ditch all the time...

If someone dared to violently destroy the iron gate of the sewer exit, the defenders more than ten meters away would definitely notice. It is easiest during the day, you can observe it with the naked eye, or you can listen to the sound. In the middle of the night, just listen to the sound directly. Because, in the middle of the night, everything is silent, if you want to destroy the iron gate of the sewer, you will definitely be heard...

What's more, because of the ingenious camouflage of the sewer exit outside the city, generally few people will find the sewer exit. Even if you find it, it’s useless—it’s blocked by a heavy iron gate... If you dare to violently destroy it, a small team of guards are not for nothing. If you block it casually and yell, you won’t be able to break through it...

...

Of course, the so-called "thick" iron gate here is only for the dog hole. Compared with the real big iron city gate, the iron gate of the sewer here is really not thick and heavy... However, under normal circumstances, it is too difficult to destroy this iron gate without being noticed...

But coincidentally, Marin really has a way to destroy this iron gate quietly...

So, Marin called a credible special forces soldier and ordered:

"You, wearing masks, lurk at the iron gate of the sewer in the middle of the night, and use a brush to brush the mixture of dilute sulfuric acid and paint on the iron gate of the dog hole... You guys take turns to brush until the iron gate of the dog hole Until the door is corroded... that is, until the iron door can be opened quietly..."

"What about after opening?"

"Send a few fierce generals to get into the 'dog hole' first, and cover the brigade to get in slowly... Finally, the inside and the outside should work together to capture the northeast gate..."

"Fighting General?" Everyone suddenly turned their attention to Kahn who was next to him...

"Why are you looking at me? Do you want me to go into a dog hole?" Kahn suddenly felt very bad...

"Ahem, let's not talk about this, you guys, go and destroy the small iron gate of the 'dog hole'..."