152 This caliber is a very widely used artillery caliber among modern weapons, whether it is a heavy tank, or a howitzer, a light cruiser gun, etc., it is a cannon of this caliber, which is a very good balance between lightness and power.

But the premise of this balance point is based on the power of modern shells, medieval artillery can only shoot out an iron ball, and the power is not comparable to modern artillery at all, so Duke wants to really destroy the fortress with one cannon, at least 300 mm caliber or more guns. It's just that in terms of weight, I am afraid that the artillery of this caliber weighs at least several tons, and even how to transport it to the front line is a problem, let alone build it.

The other point is that the cannon they made was not the kind of steel cannon that Duke had asked for, but a copper cannon. Bronze artillery is the earliest artillery, because the plasticity of copper is much higher, and the texture is much softer, so the requirements for the manufacturing process are naturally lower.

Copper Whisker's previous idea was also to make steel cannons, but after actual operation, they felt that it was basically unrealistic to make a few steel cannons in such a month, even if it was the use of hydraulic boring machine to continuously boring the barrel, the hardness of steel was far from being comparable to copper.

Moreover, the volume of the barrel and the required force are far from being comparable to such a small thing as the barrel. Through the test, even if it is an infinite replacement of boring tools, this month is at most a cannon boring. It's a joke to rely on this cannon to conquer Andorra City, how to say that this is also the main city of the pro-kingdom level, the defensive fortress is still very tall, and the thickness of the city wall is solid enough.

And at this time, it is too late to build a hydraulic boring machine, even if it is to build a hydraulic boring machine, the consumption of boring cutters can not be supplemented. Therefore, after all these considerations, they finally decided to use copper as the raw material for the cannon, and only copper can quickly boring out the barrel and make four cannons in a month.

It's just that the disadvantage of copper cannons is also obvious, that is, after a long period of firing, they will be more prone to heating than artillery. Moreover, because of the material factor, the copper cannon is easy to deform after heating, and it can no longer be fired at this time, so the service life of the copper cannon is lower than that of the steel cannon.

But Duke's strategic purpose is also very clear, that is, to get the artillery out in the shortest possible time, and to conquer Andorra City first. As long as Andorra City is conquered, then all the basic forces in the Storm Territory will rise to a higher level, and it will be no problem to slowly build an artillery factory at that time.

After Duke got the news that he had only made four copper cannons in the end, he could only choose to acquiesce, he understood that a month's time was actually a bit difficult in itself, and the copper whiskers were already very good if they could make them, what else did they ask for a bicycle?

In terms of artillery, if you count the follow-up events of the troops, it should eventually be able to reach six guns to participate in the battle. As long as the quality is passable, Duke believes that even a 6-inch cannon can at least open a gap in the direction of the castle under continuous bombardment.

If you can't even do that, that's okay, because Duke is ready for the next move. Now Stormcastle's granular gunpowder has been developed, and the Stormtroopers are fully equipped. If this kind of artillery can't collapse a fortress or a section of the city wall at that time, then as long as it can suppress the long-range defense or archers on the fortress or the city wall, it can basically be sent out to destroy the fortress with explosives or something.

With the current power of Stormcastle's granular gunpowder, Duke is very confident in blowing up a section of the city wall, and is even ready to do so. Therefore, Duke basically has full confidence in conquering Andorra City.

After the artillery side was settled, the entire Storm Army was mobilized, and even some reconnaissance cavalry in the early stage had already relied on the direction of Andorra City to exert pressure. Anyway, this kind of large-scale military attack, there is basically no possibility of covering up at such a close distance between the two sides, so it is better to directly tell the Prince of Andorra that he is coming!

Inside Andorra City, the Prince of Andorra is sitting in the conference hall with an extremely ugly face at the moment, and there are Archbishop Auray of Alpine City, Ryder, the head of the Teutonic Knights' Branch, Abel, the commander of the Andorran Prince's army, and other important figures, the reason why they are all gathered together today is because the Duke side has sounded the horn of attack, and soon Andorra City will also become a battlefield.

"Archbishop, Captain Ryder, I believe you have all received the news, Duke, a rebel minister, is preparing to send an army to attack Andorra City, and the Storm Army is already assembling, and they should follow their marching speed, and they will come to Andorra City in a few days, which is a very big threat to the current Andorra City!"

When the Prince of Andorra said these words, his tone was already a little nervous, because after Duke attacked Alpine City before, he had basically shifted all his attention from the previous Prince Edward or the Emperor of France to the Storm Territory.

Because of that time, he was also extremely shocked, the Storm Army, who had never looked down on it before, actually captured Takayama City so easily. Even if there is the Alpine Army as an internal factor, but his Eleventh Army does not even have the strength to fight back, so it surrenders directly to the Storm Army, which can also be seen that the combat effectiveness of the Storm Army is definitely not weak.

And in the end, the Prince of Andorra realized that the reason for the strength of the Storm Army was that the knights of the Bright Army Uther in Alpine City chose to back down in the face of the Storm Army, you must know that at that time, Casmaidu had not yet become the bishop of Alpine City, let alone appeared in Alpine City. There is only one reason why the Bright Army can take the initiative to retreat, and that is that the Storm Army is too strong, and the Knight of Uther thinks that even if the two sides make a move, they will not be able to gain an advantage.

Later, with the understanding and investigation, the Prince of Andorra can be described in four shocking words, he roughly knows the composition and number ratio of the storm army, they even the logistics army and recruits, the amount of training can be compared with their main force, if the entire mountain city alien army is added, then the storm army is at least more than 30,000 people!

You must know that the Prince of Andorra himself has only more than 40,000 people, and the small territory of Stormcastle has 30,000 people, and it is so well-equipped, which is also amazing. Moreover, it is said that Stormcastle also has a mysterious Sea Clan army, which is also incredible to the Prince of Andorra.