From dawn to dusk, the long swan sound stopped, and then a harsh golden sound came.

In front, the auxiliary soldiers and civilians who had been working hard for a day finally received an amnesty order and immediately retreated like a tide.

At this time, Zhang Qingchuan and Zhou Kunpeng not only felt like they were filled with lead, but they were not their own, but they had completely turned into machines and could only follow the abortion of people. Even though they were already covered in dirt and were injured, they didn't care at all.

As long as you can go back alive, that is the luck God gave them.

"Haha, official dog, if you have a vegetative, come up! Waste, a bunch of waste, hahahaha..."

"Come on, trash, try Grandpa's fairy water..."

"Dog guys come again tomorrow. I will serve you well. Whoever doesn't come will be the grandson, hahaha..."

As the model army's auxiliary soldiers and civilians retreated, there was a cheer in the battle formation of the refugee army, and all kinds of dirty words spread far away with the wind.

There were even extreme people who were standing openly on the earth wall and peeing in the direction of the Model Army.

In front of the fort, until the many men retreated to the safe territory and it was completely dark, Xu Changqing and others began to go down the mountain and return to the camp.

But after returning to the camp, there was no time to rest and even less time to have dinner, Xu Changqing continued to hold a military discussion and everyone discussed countermeasures together.

At this time, whether it was Wang Chengen, Zhang Ruoqi, Mao Pijiang and others, they all understood the strategic significance of Tongguan, and even more so how difficult it is to conquer Tongguan.

Especially Xu Changqing's high-intensity work rhythm also made them scold Sun Chuanting's ancestors who committed suicide and died dozens of times.

You said you would die if you die, but why didn’t you settle down on the Tongguan Fortress? It was easy to be tricked into this strong city by the thief?

Now, the Model Army has suffered hundreds of casualties, but it is still difficult to ascend to the sky!

Wang Chengen and others' faces were all under Xu Changqing's observation, but Xu Changqing would definitely not reveal it. He held a military discussion for more than an hour until everyone was hungry and hungry, and his chest was about to faint. Xu Changqing announced the meeting and let everyone go for dinner.

"Waste, waste! I actually asked me to wipe my butt. The court still rewarded the funeral so heavily. It is clearly a traitor!"

When Zhang Ruoqi returned to his tent, he couldn't help but scold him. He was so tired that he didn't want to eat the delicious food.

He was racking his brains at this time, but he still didn't think of a way to conquer Tongguan. He simply didn't bother to think about it anymore, so he lay on the bed and fell asleep soon after.

Wang Chengen is also similar to Zhang Ruoqi.

After all, I was old and my energy was far from being young. I spat and lamented a few times that Emperor Chongzhen's anxious temper, and then fell asleep.

But when Mao Pijiang returned to the tent, his whole body could not stop trembling.

Although he pretended to be like a transparent person today, he was observing Xu Changqing!

I don’t know without observing it. After observing, he suddenly... discovered something...

Even though Xu Changqing was hiding very deeply, he was born with keenness in observing his expressions and expressions, so he still caught him!

Xu Changqing seemed to be sure to take Tongguan. What he did at this time was just a show of his performance...

When he thought of this, Mao Pijiang felt cold sweat all over, and his hands and feet were trembling uncontrollably. What kind of mind and means could do this!

Being an enemy of such a person...

Mao Pijiang couldn't imagine...

...

"Master, the production of paragliders has made great progress, but if you want to use paragliders to throw flowering bullets, it may not be realistic. The main reason is that it cannot be ignited. The wind in the sky is too strong, and it is too difficult to ignite whether it is a flint or a fire slit..."

In Xu Changqing's big tent, Zhang Dagong was carefully reporting on the progress of paragliding to Xu Changqing in these days.

In fact, after seeing the topography of Tongguan clearly, Xu Changqing realized that it was impossible to take Tongguan by land, so he was studying paragliding for half a month ago.

The principle of paragliding is actually very simple. Just like a bat, you can just slide down from a high place.

No

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It is easy to make paragliders, but it takes a lot of effort to train the paragliders. During these days, Zhang Dagong and his team have been practicing secretly in a canyon dozens of miles away, deep in the Qinling Mountains.

After listening to Zhang Dagong's report, Xu Changqing nodded slowly.

Ignition is indeed a problem.

After all, there is no windproof lighter at this time.

Although Zhang Dagong had trained more than 200 paragliders on this side, if he could not form the original version of the "bomber" effect, it would still be of no use.

After all, Tongguan Road is too long, and even if Xu Changqing controls it at this time, there are still more than a dozen miles of areas.

If absolute suppression cannot be formed, let alone attacking Tongguan, even if it is the Tongguan Road, it will not be able to pass.

These more than 200 paragliders, in the face of the absolute advantage of the refugee army, were not even enough to plug their teeth...

However, as he thought about it, a cleverness suddenly flashed through Xu Changqing's mind. Why did he have to choose a thankless paragliding?

The most effective and stable weapon to actually throw a flowering bullet is clearly an airship!

When Xu Changqing thought of the background music of the airship appearing in the Red Alert in the later generations, he couldn't help but be excited!

At this time, even if you can't make airships, there is no problem in making a simple version of hot air balloons!

Thinking of this, Xu Changqing began to talk about Zhang Dagong's thoughts.

"Uh, this..."

Although Zhang Dagong was very good at studying these strange and lustful skills, he was still a little shocked by Xu Changqing.

He never thought that besides the paragliding that was already shocking, his great man could even come up with something more terrifying and incredible...

"Dagong, why are you looking at me like this? The key principle here is the conversion of air, that's it. I'll draw for you..."

Seeing Zhang Dagong's confused appearance, Xu Changqing kicked him in the butt with anger, quickly took paper and pen, and started drawing carefully.

Zhang Dagong came back to his senses and soon gradually realized that he nodded repeatedly.

...

After seeing Zhang Dagong off, it was already past midnight. Xu Changqing felt tired and couldn't help but shake his head and laugh.

If a hot air balloon is developed, it will definitely be a super killer weapon. It is certain that it will be ahead of this world for at least a hundred years!

However, Xu Changqing began to struggle with whether to take down Tongguan.

The benefits of taking down Tongguan are explained to all parties, and the main force of the refugee army in Shanxi will definitely return to the rescue. At this time, the declining situation of the Ming Dynasty was broken.

But there are also many disadvantages.

Tongguan, a fortress like a throat, was broken. How could the refugee army still sit still? They will definitely fight their lives to rob it!

Moreover, the terrain of the west line of Tongguan is much more relaxed than that of the eastern line, which is very likely to detonate a decisive battle between the model army and the refugee army in advance!

Especially if Xu Changqing blocked the momentum of the refugee army, the rat-like messes in the capital would be difficult to deal with.

After careful consideration, Xu Changqing decided to take Tongguan!

The big rats are indeed hateful, but Shanxi, including the people around them, is innocent. Xu Changqing cannot ignore the national justice and national justice for his own selfish interests!

If the refugee army could be wiped out, the court would have more energy to deal with the disasters of the Qing Dynasty.

Just like Lincoln's famous saying, as long as the big framework can be maintained first, it will always be easy to repair it later, at least it will be complete.

...

In a flash, it sped past for five or six days.

During these days, Xu Changqing has been constantly pushing the offensive on the surface, competing for the space on Tongguan Road East Road.

Secretly, a lot of effort has been spent to continue to increase research on hot air balloons.

In fact, China has long used hot air balloons, which can be traced back to the sky lanterns and Kongming lanterns that were unknown many years ago. Zhuge Liang has always been known as the inventor. By the Sui and Tang Dynasties, Kongming lanterns were already popular and were a kind of love for countless young men and women.

However, no one expected that this principle could also send people to the sky.

In later Europe and the United States, hot air balloons were an extremely popular and trendy sport. The International Aviation Association even rated that hot air balloons were the safest aircraft on the earth.

And the fact is true

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This is true. After all, the principle of hot air balloons is simple, the structure is simple, and the failure rate is lower than that of an aircraft.

Unfortunately, Xu Changqingkong has theory but no practice. He has never played hot air balloons before. It takes a lot of experiments and time from the selection of fabrics for making hot air balloons, process production, to fuel, temperature and many other aspects.

Fortunately, the overall situation could barely be maintained at this time, so Wang Chengen and Zhang Ruoqi also began to rack their brains to ease relations with the court on behalf of Xu Changqing.

However, early in the morning of the fourth day of September, Xu Changqing was about to take everyone to continue watching today's bulldozing offensive. Several horses suddenly rushed from the north, bringing a terrifying news that stunned everyone:

"The heroic city of Taiyuan is lost!"

"The migrant army has divided its troops into two groups at this time, one of which continues northward, heading towards Datong, and the other, heading towards Shunde, intending to rush towards Baoding and the capital."

The key is that the momentum of the refugee army has completely increased, and there are countless responders, and there are even a large number of landlords and gentry classes.

The whole environment is no longer optimistic about the imperial court.

"This, this, this...how could this happen, how could this happen..."

Wang Chengen collapsed directly on the ground, his hands and feet were cold, and the muscles on his face began to twitch unconsciously.

Zhang Ruoqi's face was also pale, and he was trembling and unable to control himself.
To be continued...