No matter how much Hu Jie regretted it, at this time, Zhang Sixing had already led his subordinates to the main gate of the circular mansion without hindrance. However, their attack did not go well, because the round mansion of Hu Jie's old mansion was too sturdy.

"Sir, those windows are too small for us to get into, and those walls are so strong that they can't be blown open by opening the door, so we have to go through the gate."

Looking at Lu Feizhang who came to report, Zhang Sixing couldn't help but be stunned and asked,

"What, and a wall that can't be blown up with a door opener?"

The open-door bomb is a product in the arsenal that has been operating in Kunming at the moment, and it is a weapon produced by borrowing the characteristics of "non-Newtonian fluid", which is mainly used to destroy barbed wire and blow up pillboxes.

But such a thing was so thick that it didn't blow up the walls of the first floor of this mansion, which made Zhang Sixing scratch his head a little.

"Sir, the walls are not only thick, but they also have bamboo pipes in them, and I guess there is sand in them. You know, bamboo pipes are very elastic. ”

"Let's go, take me to see, I don't believe it, there are walls that can't be blown up by open door shots."

In the blink of an eye, he came to the location where Lu Feizhang and their first blast had just begun, and what surprised Zhang Sixing was that the explosion point on the wall only caused a pit in the wall. The walls that looked like dirt had not been broken by explosives.

"Sir, I'm afraid I'm a triad."

Of course, Zhang Sixing knows what Sanhe soil is, clay, lime and glutinous rice juice, but it is too unbelievable that such a thing can block the explosion of modern explosives.

"Explosion"

Lu Feizhang's sappers shouted, and then pulled the guide of the door opener. Fire. Demand.

"Boom ......"

After the strong explosion, Zhang Sixing put down the hand covering his ears. Then he went up to the explosion site to check, and to his surprise, the wall was still not blown up.

The Sanhe soil in front of him had been blown out of a hole under the second explosion, but what made Zhang Sixing depressed was that a row of standing bamboo pipes appeared in the wall.

Yes, it's a bamboo pipe, but it's hard to imagine this thing being so strong.

But he understood the reason in a blink of an eye, and he remembered that the Dutch had used this technique in the city of Red Nest in Wanwan. They tied the knots of the bamboo pipes and filled them with rubble. The walls built in that way could not be easily pierced by the iron shells of gunpowder cannons at that time.

Of course, it's not just because of the sturdiness of the walls, a large part of it is due to the elasticity of those bamboo pipes. He could figure out the principle, but he really didn't expect that the wall of the pillar in the wall was so strong.

"If you continue to blast, I don't believe that you can't blow it up."

At this time, Lu Feizhang proposed just now, and it seemed to be a way to go through the gate, but it was not easy to get in there. Because there is a 24 heavy machine gun in the depths of the doorway, which is spraying flames outwards at the moment, blocking the doorway of the gate with firepower.

This is something that Zhang Sixing did not expect, from the intermittent firing of heavy machine guns. He could hear the machine gun shooters coughing violently as they fired, but they had no intention of surrendering.

Importantly, the machine gun was installed deep in the doorway, and the heavy machine gun was built into a sturdy pillbox.

In a double-layered enclosed space, even if the delta wings overhead are pepper ash sprinkled upwind, it may be difficult to penetrate from the doorway into the bunker in the doorway.

Moreover, the machine-gun bunker was so strong and powerful that it could not be blown up even with the "three no grenade launchers". Compared with the grenadiers of the Japanese army, the "three grenade launchers" used by the paratrooper school can shoot at the ground or shoot flat like a bazooka. All you need to do is find a large rock or wall to withstand the recoil and you can launch.

Faced with this situation, Zhang Sixing was anxious.

The "Offensive Smoke Egg" is a "non-lethal weapon" and its effect lasts no more than thirty minutes. That is, after 30 minutes, whether it is washed with or without water, the person who was attacked will be relieved. Even if you wash it with water, you can recover faster and be able to start fighting.

But he thought of a way in a blink of an eye, took off the microphone of the walkie-talkie and shouted,

"Populus Hu, hurry up, I want the airship to enter the field and prepare to rappel."

After instructing Populus Hu, he asked Lu Feizhang again,

"Did Zhang Changlin's sniper team go to the roof?"

"Go up, go up, and they don't have any trouble."

This answer made Zhang Sixing relax slightly, when the rope landed, the soldiers in mid-air were the most dangerous. At this time, it is necessary to continuously suppress the enemy.

With snipers to escort them, then there should not be much danger to the poplars who are slinging down.

With Zhang Sixing's order, a "booming" engine immediately came from the air. Looking up at the sky, which was getting lower and lower, it looked extremely oppressive, but it was actually vulnerable, Zhang Sixing looked worried.

Looking away from the airship, he saw that many soldiers on the ground were looking up at the airship, and he yelled,

"What to see, hurry, blow the wall open, hurry up and ......"

With his shouts, the work of the sappers in their hands proceeded faster. They are desperately poking the bamboo pipes with multi-purpose sapper shovels, and the only way at the moment is to break a hole in the bamboo pipes, and then stuff the "door opening bomb" directly inside.

The effect of the explosion in different directions is not the same, and a hole was cut in the bamboo pipe with a few blows, but the contents inside made it difficult for the sappers.

The bamboo pipe is also a triple soil, the difference is that the soil is mixed with a large amount of hemp silk. This makes the soil in the bamboo pipe as solid as the outer wall, even if you use another door opening bomb, I am afraid that it will still not be able to blow up the wall.

This situation made Zhang Sixing pin all his hopes on the people who were carrying out the rope landing in the middle of the round mansion. Only if they eliminated the heavy machine gun blocking the door from the inside, the large forces blocked outside could break in.

Hansen and Tetsujiro Yamaoka, who were also participating in the operation at this moment, glanced at each other, and finally understood what Zhang Sixing said, at least three different sets of plans should be prepared for the battle. Moreover, the logistics and equipment required for the three sets of plans must all be prepared.

The current situation was something that neither Hansen nor Tetsujiro Yamaoka had thought of, and it was true that if there was heavy artillery, there should be no problem with such a stockade. But if you attack with infantry, such a sturdy house can be used as a defense hub.

Also, the Germans had not yet fought the Battle of Stalingrad at the moment, and where would they know the difficulties of attacking a strong fortress.

Of course, this kind of fortress attack is not very difficult for Zhang Sixing. After all, at this time, the huge hull of the airship had been "covered" in the air above the empty space in the middle of the circular mansion.

Looking at the group of sappers struggling to wield the armament shovel, and looking at the airship in the sky, Zhang Sixing sighed in his heart:

Or is it more suitable to attack from the air, ground combat......

Thinking about the war between Russia and Ukraine in later generations, and then thinking about the war in Iraq and Afghanistan, Zhang Sixing knows that the ground war will exist for a long time, but what determines the direction of the campaign is the ubiquitous air power in the sky.