Chapter 1726： Diving equipment

The Calais Fort is extremely important for both England and France. With the Calais fortress in England, it was easy to intervene in European affairs, and easily land a large number of troops in the port of Calais, and then attack the northern France.

Originally, Henry VIII harassed France in this way. Because the first queen of Henry VIII was Princess Catherine of Spain, Henry VIII worked well with Spain in the early days. Whenever the French army went south to fight in Italy, England would land the army at Calais and then plunder the northern coastal areas of France. When the French reacted and fought back, the English army retreated into the Calais fortress, and then landed at the port of Calais to return to England, making France very temperless.

The French could not attack the Calais fortress, nor could they control the English Channel. In addition, when the timing of sending troops in England is well chosen, when the French main force is selected to go south, there is no way for the French to take England.

But since Henry VIII's daughter Bloody Mary (Mary I) dropped Calais, Britain could no longer easily attack northern France. After all, the landing of the army requires a safe landing at the port. Not only can the Calais Fort cover the landing of the British army, but also protect the retreating British army from being chased by the French army. Its function is difficult to replace.

After the French recaptured the Calais fortress, the northern region immediately became more stable and no longer worried about the English army looting the northern plains. Since then, the English can only attack the French ports on a small scale, and cannot go deep into the interior to ransack France ...

Edward is not stupid, he also knows the importance of Calais. However, he was stubborn because he was unsure of retaking Calais fortress from the French. Now, with the opportunity to recapture Calais, Edward does not want to give up.

However, Edward also had his hesitation:

"Even if the city gate is opened, the 5000 French troops in the city are not easy to provoke. It is said that there are 500 of the most elite French plate armoured infantry in the city. To deal with them, you must use a musket. However, it seems that the musket cannot be used on rainy days ... No, the muskets of the Beihai Kingdom can be used on rainy days. Earl Marin, will you support me? "

Marin nodded:

"This is no problem, I will support you 1,000 musketeers. They are equipped with 50 clockwork carbines each, enough to deal with the 500 French plate armoured infantry."

Edward nodded and said:

"That's fine. In this battle, I plan to send 20,000 troops, and your 4th and 5th legions send 10,000 troops, how?"

Marin shook his head:

"I can only send 5,000 troops, and I will never admit that those 5,000 people are my people. Your majesty is different from you. The North Sea State of the minister is on the road. Once the Calais Fortress is lost, the French cannot find it. England ’s troubles, but the trouble of finding the North Sea country is no problem. "

"So, this time the minister came over to pretend to be at odds with you, just because the French knew that I would send troops to help you recover the Calais fortress. If 10,000 people were dispatched, it would be easy for the French to see through. 5000 people were dispatched. , It ’s relatively easy to conceal. After all, most of them are your army. And after the battle, the soldiers and soldiers of the minister will withdraw overnight, without giving the French the opportunity to inquire about the news ... "

"Are you so afraid of the French?" Edward was speechless.

Marin shook his head and said nothing. He has already said this, the North Sea country is on land, and the French cannot retaliate against the British, and may anger him. Therefore, avoiding suspicion is necessary ...

In fact, the strength of the French homeland is not strong at this time. After all, the main force is Naples. If Marin is ruthless, he can also solve those people in France. However, Marin was worried about being stabbed by German princes. Moreover, if France really fell, Spain would emerge and become Marin's life and death enemy. Therefore, Marin would rather be low-key now, or venture in the past.

In addition, Marin actually concealed a killer, and did not tell Edward. Of course, this is only a spare. Only when the sewer iron gate is unavailable, Marin will use the killer ...

...

What killer? Marin actually dug a tunnel in Calais, which can connect the inside and outside of the city ...

It's just that there is something wrong with this tunnel-there is water ...

In fact, Marin had already sent a spy to seek a tunnel in Calais. But the French in Calais had a very strict investigation, so it was very difficult to dig tunnels. The difficulty lies mainly in how to avoid the French eyeliner and dispose of the soil excavated when digging the tunnel.

Because to avoid the French eyeliners, the spies only need to use the carriage that goes in and out of the city to pave a layer of mud on the carriage, and quietly carry the dirt out of the city. Then, they dug a well in public, but publicly brought a lot of dirt out. And the exit of that tunnel is on the wall of the well ...

This method was actually created by Marin based on the text "Underground Printing Office of Tbilisi" learned in previous life. After all, no one is willing to go down the tunnel to find some tunnel easily.

However, when the tunnel was dug to the end, there was a big problem-in the part outside the city, an underground underground river was dug, and a lot of water poured into the tunnel ...

Then, the tunnel more than two hundred meters long was filled with water. Moreover, the exit outside the city turned out to be at the bottom of a small river ...

After more than two years of hard work, Marin learned that the news was so angry that he wanted to kill. After blocking the exit hole at the bottom of the small river outside the city with stones, the tunnel was temporarily abandoned.

Until a while ago, Marin made a cylinder and a pump ...

Because of the rubber, making the valve becomes easier. Whether it is a water valve or an air valve, it becomes simple.

Marin showed that people made pumps to lay the foundation for future production of rubber tires. Then he asked the blacksmith to help him make a steel bottle similar to the liquefied gas tanks of later generations. Originally, Marin wanted to use this cylinder to collect the liquefied gas when refining gasoline. After all, it is too wasteful to let the liquefied gas escape directly in the air.

Unexpectedly, Marin had a sudden whims, inflating the cylinder with a pump, and then, it gave birth to the oxygen cylinder commonly used in future diving ...

It should be pointed out that the cylinders used for diving in the future will not contain oxygen at all, but compressed air. Marin pressed into the steel cylinder with a pump, which just formed the diving gas cylinder commonly used in later generations ...

Then, Marin naturally thought of "inventing" the matching diving equipment! What diving mask and breathing mask, and vented rubber tube ...

The most important thing about these things is that the airtightness is good, and there is no leakage. With rubber, these things are not too difficult ~ www.novelhall.com ~ After hundreds of failures, qualified products were made ...

...

In this way, the original irrigation tunnel that failed to dig was useful-as long as someone carried a compressed air cylinder and took a diving suit to open the blockage of the hole at the bottom of the river, it could follow the underwater passage Dive into the city. Then, come out through the well in the city and enter the city ...

As long as hundreds of compressed air cylinders and diving suits are prepared, Marin can pass hundreds of elite warriors into the city through this underwater passage and secretly open the city gate ...

This underwater secret passage is a bit like the passage from the tomb to the outside world in Jin Yong's novel "The Condor Heroes". However, in the novel, the passage can only be swallowed by the martial arts people through apnea, otherwise it will almost drown like Li Mochou.

But Marin knows science and has vulcanized vulcanized rubber, so he can easily create a diving breathing device so that ordinary people can also pass through this long underwater passage ...

Of course, this is just an alternative. Only if the scheme of using the sewer iron gate fails, will this scheme be used as a killer tool to overcome the Calais Fort ...