Zheng Sen remembered that it was around the end of the year that the Manchu Qing Dynasty broke through the border wall of the Ming Dynasty again and broke into Gyeonggi. It's just now www.biquge.info and he's not sure if anything will change in history. Theoretically, if we can carefully count the losses of the Manchus in each battle, as well as the gains they have gained, as well as the trade status between them and the eight major families in the Guannai, we can know relatively accurately when the Manchus will be able to launch a new round of attacks.

However, Zheng Sen does not have such an intelligence network in his hands, and he lacks the talents who can do such systematic analysis. Of course, Zheng Sen also made efforts in this regard, and with the expansion of the Zheng family's caravan in various places, Zheng Sen also began to arrange for them to collect various information such as prices in various places, and theoretically, by synthesizing this information, a lot of important information can be obtained. It's just that Zheng Sen doesn't have the talent to conduct such an analysis, and the formation of such a system and the cultivation of such a talent have taken a long time, even several generations, in history. For now, at least, Zheng Sen can only be extrapolated from limited information and then based on the frequency of previous Manchu wars. Based on this unreliable way of reasoning, Zheng Sen feels that the north should be safe before July to August this year.

According to the current state of Jianxin's relationship with the Zheng family and the "Dutch", once Jianshen breaks through the barrier, they will definitely attack the Zheng family's stronghold in Jinghai. So Zheng Sen still had a few months to strengthen the defenses of this stronghold in case of a possible attack by Jianxuan.

The children of the factory team are generally only fifteen or sixteen years old now, although they have eaten well and practiced well over the years, and they have been brainwashing nationalist, and their morale is high. However, it may not be a good idea to directly engage in a field battle with Jianzhi from the beginning. Moreover, most of the generals of the Zheng family are laymen for land warfare, and some of the foreigners hired by the Zheng family are actually only low-level officers in their own country, and they can be used for military training, and they are probably inexperienced in commanding field battles. If you don't get it right, maybe it's Li De.

"Relying on fortifications and relying on the power of the sea to fight this battle is probably the best choice. It's just that if history does not change, I am afraid that Jianshen will not break through until the end of the year, and the sea near Jinghai is afraid that it will freeze, so it will be difficult for warships at sea to effectively provide fire support to the ground forces. And once defeated, there was no retreat. Therefore, we must first work out a set of comprehensive combat plans. Zheng Sen thought.

The exercise on the map is also a subject that must be learned by the members of the factory protection team above the captain level, so Zheng Sen first asked people to draw a new map near Jinghai, and made a sand table based on these maps, and then handed it over to the guys of the factory protection team for discussion as an exercise on the map.

At the same time, Zheng Sen also began to place some orders for new weapons from his factories.

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These days, Wang Zhixian has begun to get used to the fact that there is a fleet to arrive in Jinghai every day, and then there is a steady stream of convoys going to Beijing, but in the past two days, that Guo Shen General has played a new trick, and the young soldiers under him have nothing to do and began to dig trenches in the ground, crisscrossing and crooked, and the zigzag trenches seem to be some kind of fortifications, but the trenches they dug made Wang Zhixian, who had stayed in the north for a few years, and was not completely ignorant of war or anything, felt a little strange.

Most of the general trenches are to avoid direct impact from the enemy and bring obstacles to the enemy's movement, so the trenches should generally be wider and deeper to ensure that the enemy cannot easily cross them. But the width of these trenches is too narrow, not to mention the ordinary soldiers, even he Wang Zhixian, can easily step over, to say what this thing can block, Wang Zhixian thinks that it can also cause a little trouble to the shield car or something, but this trouble is not too small, because the infantry who follow can easily cross this small trench by taking a wooden plank to it. As for the cavalry, it was even easier to jump over. And if you want to defend against cavalry, the distance between the two trenches should be closer, so that when the enemy's cavalry jumps over the first trench, because it is too late to adjust the pace of the horses, they may be planted into the second trench with men and horses. But these trenches dug by Fujian soldiers, the distance between the two trenches is dozens of steps away, and looking at the depth of the trenches, Wang Zhixian feels that he can easily climb out of them. What is the use of such a trench?

Of course, it is not uncommon to dig such an impractical trench, and it would be strange if my Ming army could dig trenches seriously. If the officers and soldiers in other places were replaced, they would not have taken the trenches seriously, and it was too normal to dig such useless and perfunctory trenches.

However, these Fujian officers and soldiers are absolutely abnormal, because they dug out these perfunctory trenches with an absolutely serious attitude, and if they are perfunctory, the Nat are absolutely serious and meticulous and perfunctory. Wang Zhixian has seen the process of digging trenches by these Fujian young soldiers, and the width, depth, and direction of their trenches have been honestly measured with a ruler, and the effect of the soldiers digging them is also very strict in accordance with this regulation.

Of course, there are more things than these trenches, which Wang Zhixian actually did not see, behind these criss-crossing trenches, some young soldiers are placing artillery firing points. The latest forged and drilled six-pounder guns with double-barrel technology will be placed in these positions, as the forging and drilling techniques further increase the strength of the barrel, so that the length of the barrel of the new six-pounder gun has been greatly increased while maintaining the same weight. Coupled with the new style of hair that has just been completed under the direct guidance of Zheng Sen. Shoot. The effective range of this artillery is very close to the two 24-pounder guns that Zheng Sen sold to the Manchus. If we take into account that these young soldiers have already accurately measured all the positions in the vicinity, and if they fight, their six-pounder guns are naturally more accurate, and if the Manchus really plan to drag those two 24-pounder guns to shoot at these young soldiers' six-pounder guns, it is estimated that the Manchus will probably be beaten badly.

And the new version of the six-pounder gun has an additional advantage, that is, if there is no Zheng family's specialty. Shoot. Medicine, this kind of artillery is very difficult to use. Zheng Sen has seen in some military forums about the hair. Shoot. He knew that the faster the projectile burns, the more overpressure gas will be produced in a short time, and the greater the chamber pressure will be. Of course, the higher the probability of exploding. And if the gunpowder burns out before the shell or shell flies out of the barrel or barrel, the thrust they receive will be attenuated very quickly. Therefore, the shorter the barrel, the more rapid gunpowder is needed, and the longer the barrel, the more gunpowder needs to burn slower.

From that popular science article, Zheng Senfa. Shoot. The rate at which the energy is released depends mainly on the hair. Shoot. The burning rate and burning surface area of the drug. Hair. Shoot. After the composition and physical structure of the drug are determined, it is difficult to change the combustion rate according to the required law. But by . Hair. Shoot. The drug form of the drug can change the combustion surface, and the release rate of energy can be basically controlled according to the law, so the drug form has become the current control hair. Shoot. A simple and effective method of the law of drug combustion.

Zheng Sen knows that according to mathematical principles, under the condition of a certain volume, the surface area of the sphere is the smallest, and the increase in volume and the increase in surface area are not directly proportional. So if the gunpowder is made into a spherical shape, the larger the gunpowder ball, the same weight of the hair. Shoot. The smaller the burning area of the drug.

By controlling the surface area of gunpowder burning, Zheng Sen was able to effectively control the maximum chamber pressure of the gun. Therefore, the latest six-pounder guns can actually withstand much lower bore pressure than the old six-pounder guns, and the long barrel is actually specially adapted to large charges with low combustion speeds. Although according to the discipline to the critical moment, the artillery should completely destroy the artillery, but any accident can happen in the battle, so the possibility of the cannon being captured by the cannon is also objective, but if the cannon intends to use this cannon, it will be found that in the use of their hair. Shoot. In the state of medicine, if this cannon is to be used safely, the charge will be pitifully small, so that the power of this cannon will be ridiculously small. And if they increase the charge a little bit, it will naturally be a boom, and then ...... There is no then.

In addition to artillery and trenches, Zheng Sen also arranged the last shelter - a multi-layer tunnel based on the brains of the guys of the factory protection team. The proposal to dig a tunnel as the last refuge was put forward by a gunner named Niu Thirteen, and his proposal immediately triggered Zheng Sen's inspiration, which reminded him of an impassioned song: "Tunnel warfare, hey, tunnel warfare, ambush millions of divine soldiers......"

If you want to talk about playing authentic, during the Anti-Japanese War, the military and civilians in the Jizhong Plain of my country can be regarded as playing this thing out of the realm. Zheng Sen had also visited Gaojiazhuang and Majiahezi in his previous life to visit the miraculous underground Great Wall, so this set of methods was also used. A long tunnel has been excavated continuously, and its furthest exit is almost five kilometers away, according to the design. Where to step on the ice, and then it won't take long to transfer to the Zheng family's warship.

Now there are still a few months left, Zheng Sen began to prepare for the battle in Jinghai at any cost. This was their first battle with Jianshen on land, in order to win, in order to let their army have a good start against Jianxin, in order to break the myth that "the Jurchens are not satisfied with ten thousand, and they are invincible", so that the soldiers of the Zheng family can have no fear of them, Zheng Sen feels that it is worth paying no matter how much money he pays.