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The castle is near the sea, so even if it is flooded, it will soon flow into the sea.

Everyone discussed repeatedly, but they couldn't think of a good way, so they could only besieged until the castle ran out of food.

Tie Hong asked, "Do you want another night attack?"

"I'm afraid it's not easy to fight." Zhang Xianzhong shook his head.

At this moment, an officer in his 20s raised his hand.

The officer's name is Li Cunhui, and he is a missionary officer transferred from Liaodong.If there were casualties in the Luzon Datong Army, ordinary soldiers would supplement them on the spot, but mission officers were transferred from the mainland.

Li Cunhui said: "The cities of Liaodong Tartars also have sharp-edged enemy towers similar to bastions. Later, they learned from us to build bastions. I have participated in several siege battles. The difficulty of attacking bastions is that the besiegers are on the way to attack. , was bombarded by the defending artillery and caused a large number of casualties. However, the artillery of the siege side hardly caused damage to the defenders. I was in the army, and I have been teaching myself mathematics. I think this is a geometric problem.”

Those present did not understand.

Li Cunhui took out a small notebook and wrote and drew: "Our army's previous trench digging was too complicated, and the amount of work was too large. In fact, it can be simplified. Just align the edges and corners of the bastion, and align the edges and corners of the bastion. Extending outwards, dig a ditch in the shape of a "B" along this line. At each corner of the trench, dig a section of parallel trenches. In this way, it is difficult for the defending artillery to hit the attacking party. And the attacking party In front of each section of parallel trenches, you can use sacks of soil to build fortifications, hide behind the fortifications and in the trenches, use firecrackers to shoot at the city, cover the friendly troops who continue to dig the trenches, and block the enemy who goes out of the city to destroy the trenches."

This little book was passed down, and one after another was carefully read.

The schematic drawing is very simple and vivid. Even people who have not learned geometry, as long as they have a normal mind, they can understand the benefits of this excavation method.

Doubling the amount of trench excavation works, while reducing casualties when digging trenches.Especially the additional parallel trenches, where fortifications were built on the spot, made it impossible for the defenders to come out to make trouble.

Zhang Xianzhong was very interested and asked, "How to deal with the artillery of the defenders? It is difficult for the artillery of the attacking side to hit the defenders, but it is easy for the artillery of the defenders to hit the attacking side."

"It's also a matter of geometry."

Li Cunhui continued to draw the pattern: "The artillery on the attacking side should not be laid out in a single word. A castle with four corners as bastions, such as the castle of the Dutch. The artillery positions on the attacking side only need to be set at eight points. Every An artillery position is on the parallel line of the castle wall. As for which point to set on the parallel line, it needs to be calculated based on the height of the wall, the caliber of the artillery, the weight of the shell, and the shooting elevation angle.”

Zhang Xianzhong was really confused this time: "You still need to use arithmetic?"

"This involves the analytic geometry created by His Majesty, and it is also related to the physical and mechanical movement," Li Cunhui continued to draw a schematic diagram, "After careful calculation, the shells fired by each artillery position, as long as the error is not too large, can fall on the city wall. Moreover, the cannonballs jumped and rolled forward along the city wall, and a single cannonball could hit a string of enemy troops, and it was useless for the soldiers on the defensive side to hide behind the parapet."

Everyone gathered around, and they understood the general principle, but they were completely confused about how to calculate it.

Li Cunhui said: "I have calculated the Dutch castle in front of me in detail. Because one side of the castle faces the sea and the other side is too close to the city, only three of the theoretical eight excellent artillery positions can be used. In addition, due to the Complexity, the angular line extension excavation method I designed can only dig the trench to the moat, but can't dig all the way to the bastion. Therefore, the artillery can only be suppressed by parallel shooting at low elevation angles, and then people have to use their lives to attack. "

Tie Hong said: "Don't be in a hurry to attack the city, go try your artillery or something like parallel shooting."

Everyone went out of the city together, and Li Cunhui was on the east side of the castle, using a modified version of the measuring ruler to make observations.First find the extension line of the castle wall, then use the equation to calculate the height of the wall, and then calculate the shooting elevation angle and the drop point of the shell.

For a few 10 minutes, I did nothing but do math problems.

The position of the artillery position is calculated, and then the artillery position is built.

In front of the artillery positions, sacks filled with soil were used to pile up fortifications layer by layer, leaving only a hole at the barrel.

The three cannons were pushed up and arranged vertically in a line.

The artillery of the defenders can already hit this artillery position.But this location is too weird to pose a threat to the city wall at all, so the Dutch defenders all stood in the castle to watch the excitement, waiting for the Datong army to waste ammunition by firing cannons outside the city.

"Can this be done?" Sun Kewang expressed doubts.

"Boom boom boom!"

Three shells were fired, crossed the bastion in the southeast corner, and then hit the wall connecting the two bastions.

This style of play will not cause any damage to the city wall, and the continuous bombardment will not be able to collapse the city wall for a year.However, the flying direction of the cannonball is kept parallel to the city wall, as long as it is not shot too crookedly, it will definitely land on the city wall.

As for where it falls on the city wall, it doesn't matter anymore.

Because the shooting elevation angle is very small, after the shells fall, they bounce off the city walls.Every time it bounced and rolled, it would hit the defenders of the city, and a dozen shells would form a large string.

The watchman on the hot air balloon was dumbfounded.

Three shells smashed out, hitting more than 20 enemies while bouncing.The Dutch army was all in the bastion, and the walls were full of Dutch civilians. They were frightened by this method and ran away crazily. In a blink of an eye, no one dared to stand on the wall.

"Fight back, fight back!"

The Dutch artillery commander finally couldn't sit still, and ordered the city defense artillery to aim at the artillery position and shoot.

"Push the cannon back!" Tie Hong ordered hastily.

It is not a formal siege now, only three artillery pieces are used for experiments.And the city fire artillery of the defenders will definitely be able to smash the fortifications of the artillery positions.

After the experiment was over, everyone went back to summarize.

Sun Kewang said: "This method is really useful. But it can only attack the defenders on the city wall, not the defenders in the bastions."

Lieutenant General Zhan said: "It is enough to hit the defenders on the city wall. The bastion is dealt with by digging trenches. The artillery suppresses the enemies on the city wall, and many people will be killed when attacking the city. If the city has no ridges Fortress, with this bombardment method alone, the defenders dare not stand on the wall, so the siege can be taken easily?"

Zhang Xianzhong said: "That's right, if there was such a method of firing artillery a month ago, why would we use night raids to attack Batavia?"

"It's not that easy to win," Li Cunhui said, "but it can indeed reduce the casualties of the siege. I have been thinking about it when I was in Liaodong, but I didn't learn analytic geometry at that time. It was the bombardment of the city of Batavia. At that time, I had some ideas, and I finally figured it out two days ago."

The method is very good and can be promoted by the whole army, but it is useless against the bastion in front of us, mainly because the moat is too disgusting.

Of course, it can be knocked down with a little effort.

Dig the canal first, and divert the water from the Tiger Canal to other places into the sea.Then fill the moat with negative soil, and then excavate z-shaped trenches with angular lines, build fortifications with extended parallel trenches, and suppress the city wall in a parallel and low elevation angle, so that the bastion can be forcibly attacked.

This offensive plan has to wait until the rainy season has passed.

If everything goes well, it should take three months from digging the canal to capturing the castle.

Chapter 829 [Breaking the Governor's Mansion]

"Bang bang bang bang!"

Inside the castle, there were sporadic gunshots.

After hearing the news, civil and military officials came to the north city wall to check.

Liu Hanyi asked, "What are the Dutch doing?"

A watchman who just got off the hot air balloon pointed in the direction of the castle and said, "There are gunshots coming from the position of the Dutch Governor's Palace. At first there were sporadic gunshots, then the sounds became denser, and then became sparser again. It has been going on for a long time. For more than ten minutes. The defenders of the four bastions of the enemy army went towards the governor's mansion one after another."

This is the role of the hot air balloon. If you stand on the city wall and observe, you will never be able to see it so clearly.

"The enemy's internal strife?" Liu Hanyi asked doubtfully.

Deputy envoy Sun Jie asked: "Is it because the enemy is using tricks to lure us to attack, and then kill us by surprise?"

"I'll go up and have a look!" Zhang Xianzhong said.

Soon, Zhang Xianzhong also boarded the hot air balloon, picked up the binoculars and observed carefully.

Due to the occlusion of the building, it is difficult for outsiders to see clearly what is going on inside the castle.

Fortunately, the Governor's Mansion was built quite high, and Dutch soldiers could be vaguely seen hiding on the roof of the Governor's Mansion, shooting continuously towards the outside of the Governor's Mansion.Similarly, there are also soldiers outside the Governor's Mansion, firing guns into it, and bullets leave marks on the outer wall from time to time.

Moreover, outside the Governor's Mansion, there seemed to be more than one force, and they were also firing at each other.

Zhang Xianzhong said to the flag commander: "Wave the flag and gather troops to attack!"

It was impossible for the flag commander to listen to Zhang Xianzhong, but he admired Zhang Xianzhong a lot, and chose to carry out half of it, waving the flag order to gather soldiers.

Liu Hanyi couldn't understand Ling Qi, and asked, "What did you say on the hot air balloon?"

Tie Hong explained: "Gather soldiers."

Liu Hanyi was overjoyed: "Zhang Village has been on the battlefield for a long time, so I'm sure you won't be mistaken. Hurry up and gather troops to attack the castle!"

Zhang Xianzhong slipped down from the hot air balloon, impatiently said: "I can't wait, we count as much as we gather, and go immediately to attack the city. This opportunity must be seized, and the enemy cannot be allowed to quell the civil strife!"

Tie Hong immediately said: "Soldiers here, you and I will attack the nearest southeast corner bastion. I will attack the southwest side of the bastion, and you will attack the southeast side of the bastion. Yu Zhan, you continue to gather troops, depending on the situation. Choose which side to support."

"Yes!"

Vice General Zhan responded.

Planks, rafts, and wooden ladders have been stationed in Beicheng District. At this moment, the soldiers rushed out of the city gate after lifting them up.

The Datong Army, the Ronin, and the Han Rebel Army were all crossing the river, and the Dutch defenders in the bastions were still hesitating whether to fire.Because their commanders are attacking each other around the governor's mansion. Some people want to rebel and seize the governor, while others want to quell the chaos and protect the governor. There are no officers in the bastion to command for the time being.

Even if there is no commander, the first reaction of the defenders should be to shoot and fire.

The reason why they hesitated was because they still wanted to survive in their hearts, and they didn't want to be besieged by the Chinese army until they starved to death.

This time, there were a few European soldiers who followed the attack.

When they voluntarily surrendered in Malacca, they promised to let them continue to serve as soldiers, but at first they were only auxiliary soldiers.Some of the soldiers of the Datong Army stationed in Malacca died of illness due to acclimatization and illness, so they recruited European auxiliary soldiers to supplement them, and were borrowed by Liu Hanyi to attack Batavia.

Although these were the Dutch army who surrendered, the Portuguese and Germans were the most numerous.

At this moment, the ladder was just being built, and before they had time to climb, the European soldiers shouted in Portuguese and German: "We surrendered in Malacca and served as soldiers for the Chinese emperor. We can eat enough every day, and we will receive several times your military pay." , and can save money to buy silk to make clothes! I have married a wife and is a very obedient Malay woman. She washes and mends my clothes and gives birth to my children. Do you want to ask for a wife? Do you want to Have enough food? Do you want to have a son?"

There were not many soldiers left in the bastion. Seeing that the enemy was already climbing the city wall, and there were European soldiers shouting to induce them, they actually put down their weapons and surrendered on the spot.

And the Dutch civilians on the city wall threw down their weapons and fled to the Governor's Palace the moment the Chinese army entered the bastion.

The prince of Johor also came with Johor soldiers. Seeing that the siege was going well, his eyes lit up immediately, and he drew out his machete and shouted: "Heroes and fearless Johor warriors, come and kill the Dutch with me!"

Seeing this, Sun Jie shouted anxiously: "Don't let Johor soldiers enter the castle, they will kill indiscriminately, these Dutchmen are still useful!"

In fact, there was no need for Johor soldiers to kill indiscriminately. The Dutch soldiers who had defected had already rushed in with the Chinese army.They killed Dutch civilians when they encountered them, and robbed property by the way, without any psychological burden at all.

As we said earlier, Germans accounted for 75% of the Dutch army overseas.

The hundreds of years of religious wars in Europe were first detonated in Germany.There are countless big and small lords there, playing dog brains with each other, and countries often use the German region as a battlefield. After more than 100 years of fighting, poor people are everywhere in Germany, and they are also discriminated against. They also have resentment towards Dutch civilians.

Once you seize the opportunity, you must kill yourself!

Outside the Governor's Palace.

Justice Siddens, hiding behind a building, shouted anxiously: "Climb up the Governor's Palace from the side!"

Another Dutch official replied: "I can't climb it, there are also lackeys of the governor there!"

Sidensi said again: "Leave the governor's office alone, go to negotiate with the officers who attacked us, and ask them to lead troops to arrest the governor!"

The well-endowed rebel raid has turned into an offensive and defensive battle for the Governor's Palace. These Dutch civilians are too stretched.

The Dutch army is now divided into four groups, one is the governor's cronies who defend the governor's mansion, the other is the officials' cronies who attack the governor's mansion, the other is the Dutch military officers who help the governor suppress the rebels, and the third is the neutral faction who stays behind the bastion.

The soldiers who stayed at the bastion followed the Chinese army and went in, while the other three forces were still fighting around the Governor's Mansion.

"kill!"

The Han rebels and ronin who were advancing lightly also rushed the fastest this time.They had no armor burden, crossed rivers and climbed walls very quickly, and killed the Dutch soldiers who were fighting from behind.

Seeing the Chinese army coming, Siddens walked out from behind a pillar excitedly: "I am the Batavia City Judge, my name is Siddens, and I am going to surrender if I capture the governor...I...ah...don't kill... ..."

This guy was so confused that he was shot to death by the rebel army.

The writer Neuhof, who was hiding nearby, was so frightened that his vest was sweating, he knelt down very neatly, and then walked on his knees with his head in his arms, saying in very broken Chinese: "Surrender, surrender!"

And their enemies outside the Governor's Palace, there are about 100 soldiers, all of them are diehards who are unwilling to surrender.

At this moment, relying on the building, hiding and constantly firing cold shots.

This kind of cold gun is particularly disgusting. Tie Hong didn't want to sacrifice the lives of his subordinates for nothing, so he asked Zhang Xianzhong to take the ronin to eliminate them.As for the Datong soldiers, they shot towards the governor's mansion to cover the ronin charging to kill the enemy.

Zhang Xianzhong and Sun Kewang led their respective teams, relying on the building to move forward slowly.

With an order, hundreds of ronin pounced out, and more than a dozen were knocked down by cold guns in an instant.The rest of the ronin continued to charge, there were no decent fortifications here, and when they got close, they swung their samurai swords and chopped off their heads.

Lin Laoshi's right ear was blown away by a bullet, he rushed across the flower bed bleeding all the way, and stabbed the Dutch soldier to death with a gun.Then he continued to move forward, and there was an enemy hiding behind a pillar. He just heard the gunshots.

When Lin Laoshi rushed to the side of the column, the Dutch soldiers were still buried in filling the ammunition, and only raised their heads when they heard the sound of footsteps, and a long gun had already pierced his throat.

The fighting gradually subsided, and the two Dutch armies in the diplomatic war in the Governor's Palace were no longer struggling. They were either killed or surrendered.

The Dutch civilians who were chased over also knelt down one after another near the Governor's Mansion, lying there trembling.

However, the governor is still inside, and there are still a group of cronies.

Zhang Xianzhong shouted: "Whoever has the biggest official here, come and talk!"

No one answered, no interpreter.

A German-born Malacca Datong Army took the initiative to translate these words.

Neuhof quickly crawled over and said, "The most... the highest position is the Batavia City Judge. He was killed by mistake by you just now. The other councilors were all arrested by the governor."

Zhang Xianzhong pointed to the governor's mansion and asked, "How many defenders are there?"

Neuhoff said: "They are all close friends of the governor. There are about 20 soldiers and a few civilians."

"Damn, there are only more than 20 defenders of the Governor's Mansion, and you haven't attacked for an hour. This is a fart!" Zhang Xianzhong cursed, "Where is the most firecrackers?"

Neuhof raised his arm and pointed: "There are more than ten people on the balcony on the second floor. As long as they show their heads, they will shoot. At first, we attacked the lobby on the first floor, but unfortunately we were defeated at the corner of the stairs. Now the governor The gate of the mansion has been blocked by furniture, and it cannot be pushed open if there are fewer people."

Tie Hong ordered: "Surround the Governor's Mansion, bring the artillery over, aim at the gate and blast it open! Call Yu Zhan and let him take the prisoners."

Governor Rainiers climbed to the top of the building and watched the Datong army move the artillery, and fell into despair in an instant.