As the name suggests, the cave siege is to dig tunnels to siege the city.

In fact, the tactics of digging tunnels in siege have existed in ancient times, but at that time, the siege of the cave only arrived inside the city from outside the city through the tunnel, and unconsciously carried the gods of troops outside the city under the nose of the guarding city to a certain place in the city, and then at a critical moment, he took the city together while he was unprepared and attacked inside and outside.

This siege method was widely used in ancient times and had significant effects. But we should know that war is constantly improving. With the promotion of this method, the defenders also figured out defense methods. The best way is to check the fluctuations in the well water surface in the city. Once the well water sinks, it means that tunnels are being dug outside the city, causing soil erosion.

Or dig a few places in the city, then bury a large water tank and listen to whether there is any movement underground through the water tank. This method is reflected in the old anti-Japanese movies. A young Japanese devil squadron leader with a sanitary face hiding in the county town, sneaking his ears to the edge of the buried large tank every day to listen to the movement, fearing that the Eighth Route Army outside the city digs tunnels and breaks into the city.

However, the Ming army's siege of the cave is different from the above. The Ming army used the siege of the cave is actually a blasting operation, that is, first digging the tunnel and digging the tunnel under the city wall without knowing it, and then transporting the gunpowder into it and blasting it directly.

This kind of siege method was created by the Taiping Heavenly Kingdom in its original history. When the Taiping Heavenly Kingdom fought against Wuchang, it was a method of siege to capture the city by siege. Zhu Yicheng also adopted such a method to capture Hangzhou and Nanjing. Now Yang Xu's old trick was repeated, and he wanted to use this method to capture Ulan-Wud.

The most important thing about siege in the cave is that the opponent cannot discover it in advance. Therefore, when he decided to use the siege to attack Ulanwude, Yang Xu did not stop his attack on Ulanwude. However, the current attack is more used to attract Ulanwude's defenders and cover the siege tactics.

Civil engineering work cannot be completed in a short time. Moreover, the city walls of Ulan-Ude are extremely strong and there is only one chance to attack the city in the Ming army. Yang Xu must ensure success.

Ten days later, with the efforts of the Ming army engineers, the cave operation was finally completed. The Ming army dug three tunnels and dug them directly under the wall of Ulanwude from about five miles outside the city.

After the Ming army's earthwork was completed, the defenders of Ulanwude still did not notice the Ming army's movements, which made Yang Xu breathe a sigh of relief. Next, Yang Xu issued an order to transport gunpowder into the tunnel as soon as possible. Taking advantage of the night, the Ming army soldiers carefully moved boxes filled with gunpowder to the city of Ulanwude through the tunnel. When it was dawn the next day, the Ming army, who had been busy all night, finally buried thousands of kilograms of gunpowder.

As soon as the sky lighted up, the Ming army began to fire artillery at Ulan Ude. As the cannon sounded, Gregori came to the city to inspect the defense line and arranged troops to deal with the Ming army's upcoming siege.

These days, the Ming army was like this almost every day, first with a bombardment, and then sent infantry to attack the city. After the infantry was defeated by the defenders, the Ming army then bombarded the city again, and then continued to attack the city...

You and I go back and forth, and you have to repeat this movement three or four times a day. Gregory had already figured out the habits of the Ming army. In his opinion, the Ming army did this to no avail, because the impregnable Ulan Ude was not something that the Ming army could break. The Ming army did this without any benefit except to leave a few bodies under the city of Ulan Ude.

However, Gregory was happy to see such a rigid attack method of the Ming army, because the more the Ming army was like this, the less it was possible for them to take down Ulan Ude. Moreover, as the weather gradually became colder, the severe cold was coming soon, and by that time the end of the Ming army would arrive.

"Your Excellency, it's snowing!" As soon as he arrived at the city head, Gregory had time to inspect the city defense, the adjutant beside him reminded happily.

Gregory was stunned at first, then he was delighted. He looked up at the gray sky, and a snowflake happened to fall on his forehead.

When I reached out and touched, Iron Chi touched a newly melted water stain. After looking carefully, more snowflakes were floating in the sky. Although the snowflakes were not big, snow was snow after all.

"Haha! Haha! OK! Good! Good!"

Gregory laughed loudly, God blessed his people, those Ming army, damn pagans, wait! The first snow has begun, and the temperature will drop sharply in a few days. When the heavy snow covers the entire Siberia, the Ming army and Mongolians outside the city will be frozen to death.

The little snowflakes were floating, not only Gregorian, but also the entire Ulan Ude defenders knew it quickly, and at the same time, Ula cheered.

At this time, the Ming army outside the city seemed to be shocked by the sudden snowfall. The Ming army's artillery stopped unexpectedly. The Ming army outside the city did not send infantry attacks as usual. Instead, it was a little turbulent. In the eyes of the Ulan-Ude defenders, the Ming army must have been panicked, because fools all know what this means with the first snow.

More than ten minutes later, the Ming army still showed no sign of attack. On the contrary, the Ming army's troops seemed to be mobilizing something.

"They are going to retreat." Gregory smiled confidently, and the adjutant beside him also had a smile on his face.

This behavior of the Ming army was normal for Ulan Ude's defenders. The appearance of snow completely lost the possibility of capturing Ulan Ude. The defense Russians saw that the Ming army still showed no sign of attack and even had the intention to retreat. They all felt relieved and began to cheer unscrupulously.

In the eyes of these Russians, the failure of the Ming army was a foregone conclusion. If the Ming army did not want to be wiped out in front of Ulan-Ude City, then there was only the only way to retreat immediately.

For a moment, cheers, laughter and excitement resounded throughout Ulanwude. Many happy Russians even took off their pants at the top of the city, took out their guys unscrupulously and let them go in the direction of the Ming army, competing with each other who shot further, in order to vent and humiliate the Ming army outside the city.

"Your Excellency, congratulations, for winning a great war for the empire!" The adjutant patted Gregory's flattery.

Gregory was proud, but said beautiful words: "This is all God's arrangement, I just did it. I should..."
Chapter completed!