Because if you want to attack Yävre, then, there is a high probability that you will encounter a tough battle. www.biquge.info Therefore, it has become very important to prepare special large-caliber siege artillery.

In fact, in this era, in addition to the rear-loading bronze cannon (Furlong machine gun) was the mainstream, there was also a very ugly artillery gun with a large caliber and short barrel - the mortar gun, which was also an important component.

Mortars are short, thick, and ugly guns, and their muzzle velocity is very low due to the short barrel. However, its caliber tends to be large. A large caliber means that the shells are very heavy and very powerful to smash......

Generally speaking, in siege, mortar artillery is the main force. Because, the caliber of the Furlong cannon was too small, and the small iron ball smashed into the city wall, and it couldn't make waves at all. But the mortar cannon is different, dozens of pounds of iron balls are smashed up, even if the muzzle velocity is not high, but the weight is there, and there is a huge muffled sound when it is smashed, and the stone is easily smashed......

Moreover, because it is fired at a large elevation angle, the trajectory of the mortar gun is very tortuous, similar to the mortars of later generations. In fact, later mortars were developed from mortars.

Jävre's castle was reconnoitred by Sauer's spies, and it was built very strongly. Of course, there are no bastions against shelling yet. The bastion structure appeared in Italy at the beginning of the 16th century, mainly due to the Italian wars. Because, France is an artillery power, and it can dispatch hundreds of artillery pieces at a time. To resist shelling, the Italians invented the bastion structure. Then, slowly, the bastion spread to the rest of Europe.

But Jävre's castle apparently doesn't have a fortress structure yet, it's just an ordinary castle. But even in an ordinary castle, the main gun under Marin's command, the front-loading three-pounder gun, is difficult to blast out, even if it is replaced with a six-pounder gun. Because, whether it is a three-pounder gun, a six-pounder gun, or even a 12-pounder gun, it is a field gun, suitable for fighting in battle formations. If it is used to bombard the city wall, it will be insufficient. Because the weight of the cannonball is too small, it collides with the large stones that build the city wall, and the kinetic energy is not enough.

To give a simple reason, at the same speed, a small pebble hits a person's head, and it hurts at most, and it swells up and gets a bag or something; But if you hit the head with a shot put ball of the same speed, the head may immediately bloom, and the person will be killed on the spot......

Therefore, whether it is a siege or a naval bombardment of enemy ships, the larger the caliber of the artillery, the greater the destructive power......

In his previous life, Marin once watched a military program on BTV, which was translated from Lao Mei and talked about field artillery. In fact, Marin's three-pounder cannon data is also from this old Mei Lee. Elmy's program on the history of field artillery. Even, the barrel length of 0.65 meters was introduced by the old American host.

Marin was very impressed with the show where watermelons were beaten with cannonballs, so he remembered a lot of things. In the program, a special type of artillery was also mentioned - the Cockhorn mortar......

The Korhorn mortar, in fact, is a kind of mortar. It's just that its shape is better. According to the American uncle's host, the 24-pounder Korhorn mortar with a caliber of 14.7 centimeters and a range of 1,000 meters was invented by the Dutchman Barron Korhorn in the 17th century (1673).

Because it can shoot large iron balls weighing up to 24 pounds, it has amazing destructive power. Even if the muzzle velocity is not high, such a large iron ball, when it hits the city wall, the earth will shake the mountain. Moreover, it is projectile, it is smashed from above, and it can also go over the walls and hit the people in the city.

The most important thing is that this mortar, with a total weight of only 82 kg, is made of copper and is very light. Two soldiers could easily carry it around. When marching, the carriage was also easy to carry around.

Speaking of which, it was shorter and lighter than the Cullen naval gun that Marin had ordered to develop. However, it is precisely because the gun body is too short to shoot flat. Because, the shorter the gun body, the lower the muzzle velocity. The muzzle velocity is low, and the shell will fall not far from the muzzle.

Therefore, it is not suitable for ship gun, only for land warfare. Because, when firing on land, the Kohorn mortar can transmit recoil to the square base by relying on the large elevation angle, and then to the ground. And how stable is the earth? Therefore, after the launch of the Kohorn mortar, the displacement caused by the recoil is very small. Even if there is a displacement, as long as a line is drawn on the edge of the square base, with displacement, the gunner can easily move back to the original position. After all, it's light, and its full weight is only 82 kilograms......

But when you get on the boat, it's different, the hull is on the sea, and it's shaking from side to side. The naval guns fired at a flat range of 500 meters, and the hit rate was only one or two percent, and if they fired at a large elevation angle like a mortar, the devil knows if there was a possibility of hitting. Moreover, the hull does not stop shaking. Shaking has a great impact on flat shooting, and even more on curved shooting.

Therefore, the Korhorn mortar is only suitable as an infantry gun, not as a naval gun. However, because its shells are too heavy, they are full of lethality. Therefore, from 1673, when it was invented, until the American Civil War, it was the main force used by both warring sides to attack fortifications. Although the Northern Army also has the more powerful Super Mortar that General Grant likes to use. However, that heavy mortar, weighing up to 7 tons, was very difficult to maneuver on land and was often transported by rail lines. Unlike the Korhorn mortar, any carriage can be pulled around. Therefore, in the Civil War, when attacking city walls and fortifications, the Korhorn mortar was a very important artillery piece.

It's only 1501, and the fort against shelling has not yet appeared. If Marin made this kind of cannon that could fire 24-pound iron balls, and he could easily pull it away, it would be a joke......

When the time comes, dozens of 24-pounder Korhorn mortars will line up, and which fortress will be able to withstand a salvo? The bombardment of Vienna, perhaps, takes a little effort. But is it a matter of bombarding Jävre's little castle?

The fortification of the castle is also more related to the strength of the family. Vienna is a fortress operated by the Habsburgs, the top royal family in Europe, for hundreds of years, and it is naturally extremely strong, and later hundreds of thousands of Ottoman Turkish troops and many artillery pieces could not be conquered.

But what is Jävre's castle? It's just run by a small local family, the Wilmken family. Although the area of Yevre is not small, hundreds of square kilometers, it is as large as the territory of many counts. However, it is not very fertile, and like the rest of East Friesian Lamber, there are many swamps. Therefore, the Wilmken family did not have much source of income, and could only rely on a small amount of arable land and fishermen's supplies to survive. Therefore, they naturally did not have much money to build the castle of Jävre. The structure of the castle, according to Sauer's spies, is very average. Marin estimated that it wouldn't be long before dozens of 24-pounder Korhorn mortars fired at a single point......

So, Marin ordered the cannon foundry and began to study the Kohorn mortar according to the indicators he gave. According to data from the show that Marin watched in his previous life, the Korhorn mortar was 14.7 centimeters in caliber and used a 24-pound iron ball. In addition, its charge is 14.2 grams to 255 grams according to the program.

However, this charge was for granulated black powder of higher purity in the 19th century. Marin estimated that the current black gunpowder purification process is insufficient, and there may be errors. But that's not a problem, after the gunpowder is ready, you can test the range, and the measurement is recorded. After that, the charge is immobilized. Even, the method of fixing gunpowder can be used to facilitate the aiming and adjustment of artillery.

For its full weight of 82 kilograms, Marin did not force it. As long as the caliber remains unchanged, even if the full weight rises to 100 kg, it is acceptable. Because, lifting 100 kilograms of things, it is not too difficult, and it can still maintain high maneuverability.

It just so happened that the copper that Columbus and Draka bought from India last time had not run out, and the tin that had been bought from Cornwall, England last time when counterfeit silver coins were made, had not been used up. It is just right to use it for bronze cannons.

Once the Korhorn mortars were successfully developed, Marin planned to get a batch, and when the Danes had no time to take care of them, the Korhorn mortars lined up under Jävre Castle would use the 24-pound "iron ball rain" to smash the walls of Jävre Castle in the shortest possible time, and quickly take over the Wilmken family here......