Chapter 1058： Drill dog hole

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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. Another important reason is that-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 before the hole is produced. . And for so long, the defenders in the city can definitely respond accordingly.

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

In this era, strong acids 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 many alchemists cannot understand the chemical principles even if they can produce dilute sulfuric acid.

In the future, Marin still wants to defend the enemy's attack by relying on the door covered with white iron. How can the chemical knowledge of dilute sulfuric acid be corroded by the large public under the general public?

In fact, if it is replaced with a highly effective royal water, it is in line with Marin's requirements. Wang Shui splashed on the Tiecheng Gate, and the cave could be eroded in a few minutes. If the amount is sufficient, it is not impossible to corrupt the entire city gate.

The problem is that aqua regia is formulated with concentrated hydrochloric acid and concentrated nitric acid in a three-to-one ratio. Marin has now mastered the preparation of concentrated sulfuric acid and concentrated nitric acid, but the preparation of concentrated hydrochloric acid has not yet been mastered. Although concentrated sulfuric acid and common salt are heated, hydrogen chloride gas can be obtained, and hydrochloric acid can be obtained by water collection. However, only dilute hydrochloric acid can be obtained. It is not so simple to get concentrated hydrochloric acid.

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

Therefore, concentrated hydrochloric acid is relatively difficult to prepare, and it is difficult to obtain aqua regia. Even if Marin can develop Wang Shui, it is estimated that it will take a long time. By then, the daylily would have been cold ...

...

Marin began to meditate on countermeasures. For the problem of easily flowing down after pouring dilute sulfuric acid on the iron door, after thinking, Marin got a solution-that is, use the brush to paint the dilute sulfuric acid as the paint on the iron door Up ... so, it reduces the possibility of going down ...

In order to enhance the viscosity and prevent the dilute sulfuric acid from flowing down quickly, Marin even makes people mix some special ingredients into the dilute sulfuric acid, which makes the viscosity of the dilute sulfuric acid increase and makes it more difficult to flow down the iron gate. As long as the dilute sulfuric acid is attached to the iron gate for a long time, the reaction time is long enough, it is definitely much better than quickly flowing to the ground ...

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

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

...

After trying to pour the wastewater of the solution of paint ingredients and dilute sulfuric acid into a wastewater ditch, Marin suddenly asked:

"By the way, take a closer look, and see where is the gutter outlet in Siena City. There is always a gutter for a bigger city of Siena? Look for it!"

After asking this sentence, Marin suddenly remembered that-in many films in later generations, it seems that many spies and assassins just sneaked into the city or the house through the sewer. Maybe, it can be done through this ... Tiecheng Gate is difficult to deal with, is the sewer exit also an iron gate?

...

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

After careful investigation, the special forces fighters of Marin's men discovered that there was indeed a sewer exit in the city of Siena, near the northeast gate.

Of course, the smell of the sewer is too bad. Therefore, this sewer outlet is a short distance away from the northeast gate, lest the smell of the sewer affect the defenders at the head of the city.

However, because the entire city has three gaps in northwest, south and northeast. Therefore, this sewer outlet is not too far from the Northeast Gate.

It's just that the architect who designed the city was very clever, and used a small river ditch outside an inconspicuous gate as an outlet for the sewer. Even superb architects added a layer of "cover" (that is, a layer of brick roof) above the sewer outlet near the river ditch and the Northeast Gate to perfectly cover the sewer outlet. If you don't peel off the brick cover, you can't think of it as the sewer outlet of Siena.

The special forces fighters of Marin's men also judged that it was the sewer outlet of Siena based on the unpleasant smell. After all, the smell of the sewer outlet is definitely not very good ...

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, only 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 personally put on a mask and went to investigate. Finally, Marin came to the conclusion that the reinforced iron gate of the sewer outlet, although extremely strong, is much easier to deal with than the authentic city gate.

Of course, you can't get rid of this iron dog hole door with great fanfare. Even if this reinforced door was damaged, this martial arts officer could hardly get into the city through this big dog hole less than one meter high. This is because the dog hole is too small. If the enemy in the city finds someone rushing in from here, as long as a small team is sent, they can easily guard the dog hole. Because, this hole is too small, the big horses can't rush in. Even if you open the iron gate, you can only climb in one by one. In the process of climbing in, as long as the opponent sends a few people to hold the knife and wait inside the dog hole, he will cut off one with his head, it is easy to solve the problem ...

...

Therefore, even if Marin knew that the iron gate that got rid of this dog hole could send people into the city, he couldn't get people to do it in a big way. Because, once discovered by the enemy, the opponent's defense is very easy ...

Unless ... unless you can destroy the iron gate of the dog hole at the exit of the sewer without knowing it, and then quietly send someone to drill into the "dog hole" to achieve the effect. The main thing is that it allows several "terrorists" to get in first, and then blocks the enemy troops who come to counterattack, and provides protection for the subsequent entry of ...

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

Why? Because this is the sewer outlet, the smell is bad. Which soldier is willing to stand by the sewer outlet at all times?

Therefore, even the soldiers guarding the sewer exit are standing at the foot of the city wall a dozen meters away, looking at it from time to time, and no defenders are willing to stand by this stinky ditch to guard ...

If anyone dares to violently destroy the iron gate at the exit of the sewer, the defenders a dozen meters away will definitely notice. It is the simplest during the day and can be observed with the naked eye or listen to the sound. In the middle of the night, just listen to the sound. Because, in the middle of the night, all sounds are silent, and if you want to destroy the iron gate of the sewer, Tieding will be heard ...

Also, because the sewer outlets outside the city are cleverly disguised, few people generally find this point. It ’s useless even if it ’s found-there is a heavy iron door blocked ... you dare to violently destroy, the guards of a small team are not in vain, just block it, roar, and you do n’t want to break in ...

...

Of course, the so-called "thick" iron gate here is only for that dog hole. Compared with the real big iron city gate, the sewer iron gate here is really not thick and heavy ... However, in general, it is not noticed to destroy this iron gate ... it is too difficult ...

But by coincidence, ~ www.novelhall.com ~ Marin really has a way to quietly destroy this iron gate ...

So Marin called in credible special forces soldiers and ordered:

"You, with a mask, lurking at the sewer iron gate in the middle of the night, and use a brush to brush this mixed liquid of dilute sulfuric acid and paint on the dog gate iron gate ... You take turns to brush until the dog gate iron Until the door is corroded and damaged ... that is, until the iron door can be opened quietly ... "

"What about after opening?"

"Send some squads to drill into the‘ dog hole ’first, cover the brigade and slowly drill in ... Finally, inside and outside to seize the Northeast Gate ..."

"Mr. General?" Everyone suddenly turned their eyes to Kahn ...

"Why do you see me? Do you want me to drill a dog hole?" Kahn suddenly felt bad ...

"Cough, let's not talk about this first, a few of you, let's go to destroy the little iron gate of the" dog hole "..."