Even though the city was not transformed into a real fortress in just one month, the newly built several large sharp corners still played the role of a fortress.

Unlike the early obtuse bastions in Europe, the newly rebuilt Bago City was transformed from a Chinese-style four-corner building into an octagonal one, and these angles formed were the best cross-fire to cover the firing area.

The Burmese army had only 3,000 men, and of course could not carry out siege operations, but could only attack two of the eight angles, thus forming two parts, both of which would be fired from both sides, both from the left and right.

One of the major characteristics of the Wanli musket is that there is rifling in the barrel, although this rifling is both shallow and straight, and the spiral rifling of later generations is completely incomparable, but at present, it still has far more shooting accuracy than the smoothbore guns of the same era. Coupled with the fact that Gao Pragmatic knows the best ratio of black powder and the principle of "particle gunpowder", the firing range of the gun can almost reach the best state under the current technical conditions.

And Wanli's tactics of cooperating with the fortress to defend the city, Gao Silian, as a colonizer who opened up Huaying with very few troops, is actually very familiar.

Just like the "Shuishan Fort" that Huang Zhiting visited during the military parade in Jingang, Gao Silian built at least seven or eight large fortresses as fortress strongholds in the process of expanding to Huaying, and he was very experienced in how to maximize the firepower of the fortress when defending the city.

It stands to reason that the enemy can shoot before entering the angle, and that area is called the "first firing area" by the Gao Jiajun. But at this time, the killing effect of shooting is usually not very good, and it is easy to frighten the enemy, so when it is necessary to demonstratively kill the enemy, Gao Silian will not choose this tactic of firing at the first time.

The second firing zone is the area after the enemy enters the corner. This area is usually ready for crossfire, but it depends on the size of the city or the bastion itself, and if the city is too large, the second firing area may not be able to cover all firepower, because the range of the guns is still insufficient.

As for the third firing zone, that is the corner tip of the angle, which is the area where the crossfire is completely covered and can inflict the most powerful attack, and when the enemy army arrives here, the enemy will not only be stunned or even collapsed by a sudden burst of powerful fire, but also face a desperate return after their collapse - they will be beaten all the way back.

The Burmese Army's 3,000 probe troops were stunned by expectations, and within the crossfire coverage of the 3rd firing zone, they were met head-on by the Bago garrison.

The low-ranking officers of the Golden Harbor Garrison, which had been enriched to the Bago Garrison, personally led the shooting and loudly reminded the recruits of the shooting steps when they were shooting, when to charge, when to load, when to shoot, when to clean the barrel, and when to recharge...... And so on, these experienced officers shouted loudly, so as not to fool the Mon warriors who were new to the firearms.

Although Gao Silian, who was watching the battle from behind a bunker in the corner of the tower, was a little disappointed with the shooting speed of these new subordinates and was also dissatisfied with their shooting accuracy, the success of the tactic itself was unquestionable, and the Burmese troops who rushed up to try to erect ladders collapsed after a few rounds of random shooting.

In fact, the casualties of the Burmese army at this time were not large, and the Burmese army's losses would not exceed 200 people in the direction of this angle that Gao Silian could see, assuming that the other angle was also a similar result, the losses of the Burmese army in these rounds of shooting were about 400 people.

According to the point of view that Gao Pragmatic repeatedly emphasized to them, the tactic of "lining up to shoot" is often a comparison of discipline, that is, who can withstand the first wave of damage from the countershoot without collapsing, so it is common for the first and second platoons of the battle line to be completely wiped out sometimes.

Gao Silian understands this tactic, but the Burmese army on the opposite side obviously does not understand, not only does not understand, but they also face a different situation and shoot at the battle line - the shooting is always face-to-face, you have a chance to destroy me with one shot, I also have a chance to destroy you with one shot, whether you live or die depends on luck and shooting speed.

The key problem why the Burmese army began to collapse after only losing this number of men was that they were unable to fight back in the face of the enemy in the fortress. With only waist knives, they were not even equipped with bows and arrows, and there was no way at all except to raise the rudimentary wooden shield in their hands in vain.

In addition, the progress of erecting the ladder is also directly zero, because although the fortress has been built, Gao Silian has not given up the traditional tactics, and there are still soldiers on the city wall who are responsible for throwing rolling stones and sassalwoods downward, pouring "golden juice" on their heads. In addition, the firing port in the corner wall can also shoot at the Burmese soldiers who are attacking the city with ants on the opposite wall.

All in all, a three-dimensional strike has been formed in this area, and the Burmese army is almost in a state of turtle in an urn, unable to advance if it wants to, and difficult to retreat if it wants to.

In the end, these unlucky eggs could only forcibly brave the frantic fire of the fire net to retreat, and when the lucky ones finally escaped and ascended to heaven, they found that there were few comrades around them.

King Mang Yingli, the golden building and white elephant of the Taungoo Dynasty in Burma, looked at the soldiers who fled back in embarrassment, and an angry "all cut" stuck in his throat for a long time, and finally swallowed it back.

After all, he also saw the situation just now, if these soldiers continue to stay in the corner of the city wall, there is no other point at all except waiting for death, and now his strength is damaged, he only has these 70,000 people on hand, and killing one more is a loss of his own strength.

Captain Reddy walked over, his face was not very good-looking, and the words he said were even more ugly: "Your Majesty, it seems that we are facing very big trouble, and the situation has exceeded the pre-estimate. ”

Mang Yingli gritted his teeth, but he didn't speak with a stiff face - Lao Tzu is not blind, do you need to say this nonsense?

Fortunately, Captain Reddy didn't just come to taunt his employer, he came with a solution to the problem.

"Your Majesty, I thought that at this moment, if you didn't want to pay a huge price to take the city, then we should consider spending money to solve the problem."

Mang Yingli was stunned for a moment, turned his gaze to Captain Reddy, frowned and asked, "Spend money to solve it?" Do you mean bribing the opposing guards? But we don't even know who the opposing guard is...... Maybe Abrabon? Hmph, this traitor, I want to cut him with a thousand knives, and want me to spend money to buy him, that's a dream! ”

"No, no, no, Your Majesty, I don't mean buying off the defenders' generals when I say spending money - although that can be an option too." Reddy shrugged his shoulders and said, "I mean, spend some money on some cannons to attack this city. Your Majesty, you know, we in Portugal have advanced artillery, and if we can buy two hundred, or at least a hundred, it will be of great help in the capture of this city.

As for I, Simon Reddy, I know the Governor of Malacca and even the Governor of Goa, and I can buy these cannons as soon as possible through my connections, so that Your Majesty can recover this city of great political and economic significance as soon as possible, and I hope that you will consider this suggestion carefully. ”

As soon as Mang Yingli heard this, he sneered and said, "The artillery you sell is too expensive, a cannon of one thousand taels of silver, even the emperor of the Ming Dynasty can't afford to buy a few." ”

"Your Majesty misunderstood, one thousand taels and one is a ship-borne long and heavy artillery, and that was the quotation to the officials of the Ming Dynasty in the early years...... Of course, if Your Majesty needs it, these long and heavy cannons can indeed be moved to the shore for use, and through my connections, the price can also be much lower, such as eight hundred and one door, what do you think? ”

Mang Yingli still sneered: "But as far as I know, the cost of such a long and heavy cannon does not exceed three hundred taels of silver at most." ”

"Oh...... I admit that what you say is true, but you have to take into account another point, these long and heavy cannons from the European mainland to Burma are very expensive, not to mention that we will also give away four base shells, so eight hundred taels of silver is definitely a friendly price. ”

If Gao Yingli is here, I am afraid that he will laugh out loud directly, because after a series of standardized production transformation and technological improvement, the price of similar artillery made in Jinghua is far lower than the cost mentioned by Mang Yingli: Mang Yingli said "no more than three hundred taels", but in fact, the cost of similar artillery in Jinghua is only one hundred and sixty taels.

By the way, in the Kingdom of England at this time, the cost of artillery of the same level was about two hundred taels per gun after the conversion meeting. The reason why Jinghua can be cheaper, in addition to the iron mold casting cannon, which was used up in the crossing, is that the most critical problem is that Kaiping Industrial Zone can provide high-quality and low-cost metal.

Unlike the bronze cannons used by the fleet, the artillery used by the land division is made of iron from the first gun to the fourth gun, because there is no need to worry about the high humidity and high salt environment at sea causing the artillery to corrode, and Jinghua's iron-smelting and steelmaking capacity is huge, so it will not fall into the cost trap at all.

Even Gao Shishi is now a little skeptical that he can consider directly casting iron artillery for the fleet, because Daming is really short of copper, and the cost of this bronze cannon is enough for several iron cannons. It's just that the barrel of the bronze cannon is easy to recycle and recast after the expiration of its service life, while the iron cannon is a little troublesome to recycle and recast.

The two groups of people on the craftsman school have been arguing for a while, and neither side can convince the other, and the half-level of Gao Pragmatic does not dare to make up his mind, so he has to put this matter on hold for the time being - after all, the British in the original history still had a large number of naval bronze cannons in the Yicrow period.

As for the iron mold casting cannon, when Gao Pragmatic put forward this idea at the beginning, he really thought it was a "major innovation", who knew that he only mentioned it, and the masters understood.

Later, Gao pragmatic learned that some of them were blowing too much, and this thing was actually not particularly novel in theory. For example, in the Han Dynasty, the Two Jin Dynasty and the Song Dynasty, there were iron molds unearthed for casting agricultural tools, and Gong Zhenlin was just used to cast cannons.

So why hasn't anyone done this before? Actually, it's because there are technical difficulties.

The iron mold technology is not difficult to do in its own hardware, cast iron or cast steel can be, it is nothing more than a bearing container, in addition to fixing the gun mold, that is, the heat dissipation effect is better.

The advantage of the iron mold is that it is easy to integrate, unlike the clay mold casting cannon that must rely on time to wait for the shade to dry, a cannon has to wait for a few months after casting, and the iron mold casting cannon can be used directly after a little putting, and these hardware, the level of the Ming Dynasty has been completely realized.

However, the iron mold also has disadvantages, from the point of view of metal casting and metallography, the heat dissipation of the iron mold is too fast, which makes the pig iron liquid have the problem of supercooling when cooling, and the cementite in the molten iron has no time to precipitate (graphitization has not had time to proceed) The graphite has solidified, so the cementite in the iron mainly exists in the form of iron carbide, that is, the so-called white iron.

Of course, due to the large degree of supercooling of the molten iron during the solidification process, the metal crystalline particles on the surface are relatively dense, the body tube is smoother, and the airtightness is much better than that of the mud mold.

The real benefit of iron molds is that they speed up production and don't have to wait for months like clay mold cannons. This point is particularly prominent in Gong Zhenlin's iron mold, but the product of the iron mold casting cannon is very white, because the cooling speed is too fast, although it is relatively smooth, but almost all of the generated iron is white, resulting in an increase in brittleness and a decrease in the performance of the artillery.

So the result of this is that in order to increase the tensile strength, it can only be solved by stacking the mass by quantity, that is, by increasing the wall thickness.

How to solve this problem of high pragmatism? Oh, in fact, it can't be regarded as a high-pragmatism solution, in fact, it was later made by Jinghua Iron and Steel itself - the key is the blower equipment that Zhu Zaiyu made under the prompting of high pragmatism.

This thing is a bit troublesome to elaborate, but simply put, it is similar to the hot blast technology during the American Civil War, and the temperature in the blast furnace is high enough, so that the silicon content in the molten iron is higher, and the graphitization is more prominent when cooling.

However, this only solves the problem of white iron, which is roughly the evolution to the level of gray iron, but the problem of too fast cooling of iron mold casting cannon is not completely solved, it can only be said that it is barely usable, and the casting speed has been greatly improved, and it is acceptable after comprehensive consideration of high pragmatism.

As for the problem of the cooling rate of the iron mold, Gao Pragmatic knows the principle of the solution, which is the so-called water cooling of the inner mold, but this thing seems to be quite difficult, and it has been several years since Jinghua Iron and Steel got his prompt, but there is basically no progress. It's just that Gao Pragmatic only knows such a superficial theory, and his practical ability is completely zero, so he can only continue to wait.

The issue of purchasing artillery has reached an impasse, and Mang Yingli can't afford to spend so much money to buy expensive Portuguese artillery now, Captain Reddy left with great regret, and before leaving, he was very shocked Mang Yingli and said: "The capture of a large fortress is very difficult even in Europe, except for smashing a large number of artillery, there is almost only a long-term siege, Your Majesty should think about it." ”

Mang Yingli didn't know if there was an element of intimidation in his words, but the predicament in front of him was obvious, and it was definitely not the way to continue the assault at the moment, so he had to order a halt to the attack and begin to deploy a siege.

Gao Silian's strategic goal of fighting so that the opponent did not dare to attack in a battle was achieved.

In fact, he was also a little scared in his heart, not because of anything else, but because he had never commanded tens of thousands of people before, and the largest command force was only three or four thousand, and the fortress he was guarding was not a super-large "fortress" like Bago City, so he had always been worried about whether his side would be able to command it if the other party launched a general attack.

After all, the establishment of the Bago garrison was an accident in itself, which led to the fact that there are only some low-level officers left except for him who are from the Gao family, and the middle and high-level command system is basically empty. If you really face an all-out battle, the devil knows if there will be problems everywhere.

As a result, inside and outside Bago City, a situation was formed in which the two sides were afraid of the wolf.

Gao Silian took the binoculars and looked at the Burmese army who began to set up camp, breathed a sigh of relief, and cast his eyes to the east again, and said secretly: I don't know when the Dutong side will choose to launch a counterattack, whether to take advantage of the unstable foothold in Mangyingli to fight back, or wait for a while and wait for the Burmese army to completely relax before fighting?

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