In addition, you must leave a vent when digging a tunnel, otherwise people will not be able to suffocate inside?

It's a harsh winter, and the white air coming out of the vent can't be whirring, and you can see it from a mile away!

Once it is discovered by other defenders, it will be in vain, because there are ways to deal with it, the simplest is to use catapults to smash them indiscriminately, or artillery to bombard, and no matter how strong your tunnels are, they can collapse for you, let alone not strong......

Of course, it is also possible to take the form of a strong attack, but the damage can be very heavy, because Baisha City is three times stronger than Wolong Pass!

Lin Yue and the others made a sand table drill according to the situation of the city's defense, and came to the conclusion that if they captured the city, they would also suffer at least 30,000 casualties.

This is just a drill, if it is a real battle, I am afraid of more casualties!

The city wall is as high as five zhang and the width is up to six zhang, all of which are made of blue stone bricks and glutinous rice slurry lime, plus a thick layer of ice armor outside, Zhang Mingyuan said that if you want to make a hole, you need at least 100 shells to hit the wall with a circle of one zhang in a row.

After all, the power of artillery is still quite limited.

In fact, the Yanyun County Arsenal has now developed a more powerful artillery, but it has not yet equipped the whole army......

"If you really can't do it, just mobilize more heavenly troops to come over, send a death squad into the city, and see if you can storm the city gate?" Lin Yue thought about it and felt that if he wanted to attack, he had to have a considerable heavenly army to help in the battle.

But this place in Baisha City is very lacking in morality, and it is in the middle of the wind, and the wind blowing above the city is not the southeast and northwest winds, but a whirlwind!

When a hot air balloon sent to reconnoiter flew into the city, it was suddenly swept out of control by a whirlwind and fell directly into the city!

The reason why they did not mobilize more celestial troops to participate in the war was mainly due to weather reasons, because the spherical material of the hot air balloon should not be frozen, and it was easy to crack in extremely cold weather, and it was not good if the wind was too strong, and it was very easy to get out of control.

It's extremely cold now, and the wind from the northwest is particularly strong, and the wind blows like a knife when you stand on the ground, what does it feel like if you are in mid-air?

No matter how thick the leather coat can be blown through, and the control system of the hot air balloon is extremely precise, it is very inconvenient to wear gloves......

"It's not impossible to do this, but the chance of success is too small, and even if we transfer a hundred hot air balloons, we will only have one chance to act......" Xiao Chen hesitated, because the Heavenly Army was really not suitable for fighting in such weather conditions.

Everyone was discussing, and suddenly Yuan Kaishan broke in, and without saying a word, he knelt down directly for Xiao Chen with a poof.

"What are you doing here?" Xiao Chen was taken aback, "Get up and speak!" ”

"Master Hou, I'm afraid that Kaishan will have to go into the city!" Yuan Kaishan said, "Just now we went out on patrol and met a few people who came out of the city a few days ago, and one of them was an acquaintance, saying that my mother is in the city now...... Before the opening of the mountain, he was already disloyal to the emperor, but he can't be unfilial anymore! ”

"Huh?" Xiao Chen was taken aback, "There is such a thing?" Is that true? ”

"It's true, that man is still a distant relative of mine, and he saw my mother being taken into the city...... Duan Fengnian must have known that I had surrendered to the Great Shuai, so he took the old mother...... Dashuai, the old mother of the mountain is over eighty years old, how can she be so frightened? At this moment, I don't know whether I live or die, and I am anxious! ”

"Kaishan, you can't go into the city at this time." Xiao Chen sighed, "Otherwise, not only will you definitely die, but the old lady will also be unable to protect ......."

"Then at least our mother and son can die in one place, I have made up my mind, this is to say goodbye to the master, if the handsome man does not allow me to go, immediately kill myself in front of the hall!" Yuan Kaishan said and pulled out his knife across his neck.

"Open the mountain, don't do this." Xiao Chen hurriedly said, "Don't worry, let's think about it in the long run, I will find a way to ......"

"Kaishan is now concerned about the old lady, and his heart is like an arrow, but he has no intention of thinking about it!" Yuan Kaishan said that he walked out quickly with a knife, got on his horse and galloped away.

"Oops, it's time to open the mountain!" Xiao Chen and the others hurriedly chased them out, shouting loudly together, Yuan Kaishan turned a deaf ear, quickly whipped up, and arrived at the city in an instant.

"Hey, who should I be so bold to dare to break through single-handedly, hehe, isn't this General Yuan Kaishan? I heard that you have surrendered to Li Qiu'er, are you here to see me to kill me, or to be a lobbyist? Duan Fengnian at the head of the city saw clearly that it was Yuan Kaishan who came, and he sneered and spoke coldly.

"Lord Wang, Kaishan is here to send him to death, and he will die without regrets!" Yuan Kaishan dismounted and knelt in the snow, "I just ask the prince to look at the little affection of the old days, show mercy to his subordinates, and let go of the old mother of Gaotang!" ”

"Hahaha!" Duan Fengnian raised his head and laughed, but there was not the slightest smile in his eyes, "I don't know that you Yuan Kaishan and I still have a relationship?" I treat you well, but how do you repay you, how can you really make this king's affection embarrassing, it's okay, since you are willing to come back, I can't turn him away, come, pull him up! ”

As soon as Duan Fengnian waved his hand, a big basket immediately hung down from the city.

"Open the mountain, don't go up, come back quickly!" Duan Qiyun had just heard the news and rushed over, and when he saw Yuan Kaishan about to step on the basket with one foot, he couldn't help but shout.

"Open the mountain, don't be confused, if you go up, the old mother will die!" Xiao Chen shouted.

Yuan Kaishan hesitated slightly, but still stepped into the basket, and the people above immediately pulled him up quickly.

As soon as his foot landed, he was kicked over, tied up, and carried it in front of Duan Fengnian.

"Lord Wang, I am willing to open the mountain, I just ask the prince to let my mother live!" Yuan Kaishan kowtowed to Duan Fengnian repeatedly, and his forehead was instantly blurred.

"Hehe, since you Yuan Kaishan is so hard-boned, then I will fulfill you, come, take off his clothes, and give me a thousand knives to cut him, so that those dog thieves can see what the fate of betraying this king is!" Duan Fengnian said and suddenly laughed again, "But if you die, your old lady wants a white-haired person to send a black-haired person, and it's pitiful, I think it's better to send her on the road first, and let you be filial to her under Jiuquan!" ”

"Duan Fengnian, you ......" Yuan Kaishan was shattered when he heard this, and his eyes were about to split!

After a while, the two soldiers picked up Yuan Kaishan's white-haired old lady and threw it directly in front of Yuan Kaishan.

"Yuan Kaishan, you disloyal, unrighteous and unfilial dog! Stare your eyes wide and see clearly, your wife was killed by you...... Come on, cut her down! Duan Fengnian gave an order, and a soldier swung his knife to cut off the old lady's head and threw it directly under the city......