In Tongguan, Cao Xuan is already working on the retreat.

After half a month, he had to stay here for half a month at most, and he decided to leave.

And in half a month, he felt that he could still persevere.

The most critical step to defending Tongguan City is to defend Jindou Pass. For this reason, Cao Xuan sent another thousand people to Jindou. These thousand people belonged to Cao Xuan's own personal guards.

On the tenth day after Zhu Youzhen left Chang'an, when You Yong repeatedly failed to defeat Jindou Pass and was a little helpless, Zhu Yi led a group of people to Tongguan.

Zhu Yi, a fire pig in the secret camp of Daqingshan.

This is a special force. They are not good at fighting, but they are all skillful and have some crazy ideas that ordinary people cannot reach. Li Ze's training of them is different from other secret camps, either focusing on fighting or tracking, spying and assassination. This group of people is undoubtedly the most knowledgeable group of people in the secret camp.

They control the most secret things under Li Ze's rule.

Whether it is the development of military-based sulphur bombs or the invention of civilian-based sulphur hammers, it comes from this organization that has never been known to outsiders.

They not only study civilian things, but also murderous things.

Even in the Wuwei Academy, which is now recognized as the research on all these aspects, is far behind them. With the rise of many detailed classifications of various subjects in the Wuwei Academy, the main direction of the fire pigs in the room has gradually shifted. They are now specializing in the military industry. The original civilian talents and scientific research results have basically been transferred to the Wuwei Academy. The rest are all things that are not suitable for publication and are highly confidential.

Zhu Yi is fat.

Unlike other secret camp friends who are muscle-filled, both men and women are brave and fierce. He always smiles because he rarely exercises his body. He looks very funny, as he is fat and fat.

But both You Yong and Shi Zhuang were very polite to him.

Because this fat man who looks like he is smiling, the things he makes are really extraordinary. The purified irritating oil bomb was made by him. This thing has helped Tang Jun so much over the years.

"Deputy Supervisor Zhu, Jindou Pass is completely made of hard stones, which is very special. Because we used the fierce turret bomb many times, the enemy has roughly understood its characteristics and has some special methods to deal with it. This makes it not significant even if we use the fierce turret bomb in Jindou Pass." You Yong said to Zhu Yidao with some worries. "Now that Li Xiang has arrived in Luoyang, I don't have many other ways, so I can only use human lives to pile it up. General Shi is ready to go barefoot."

Zhu Yi smiled and glanced at Shi Zhuang and said, "In this weather, if General Shi went to fight with his bare arms, he would be very cold."

"Not cold, not cold!" Shi Zhuang pinched his fist and said, "It's so hot that it's hot. Think about it, if the knife goes on, how can it be cold if the hot blood splatters on your body?"

Zhu Yi shivered and waved his hands repeatedly: "It's too cruel, too cruel. Don't tell me about such a thing."

Brutal, your mother's fuck!

Shi Zhuang cursed in his heart, if there was really a word from King Yama in this world, in his old man's account, the account under your Fatty Zhu's name would be many times more than the account under my name of Shi. I killed someone, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, one by one, and no one by one dies, is killed one by one, and no one dies happily.

"What good things did Deputy Supervisor Zhu bring to us this time?" Shi Zhuang was dissatisfied, but his face was still full of smiles. For those generals who led troops to fight, people like Zhu Yi really had to offer.

"I did bring a few things." Zhu nodded and said, "They are not very mature yet. Experimental products. This time I will take them to the battlefield to try the waters and see how the effect is?"

"Do you know?" Shi Zhuang asked.

"Young Master knows, but you have always been dissatisfied with what you made before." Zhu Yi lamented, "Actually, it's already very good in my opinion, but every time I'm told you that you're useless. For this thing, I've been changing it for nearly two years."

You Yong and Shi Zhuang looked at each other, "Is it something I studied at the former site of the Daqingshan Secret Camp?"

"Yes!" Zhu Yidao.

The former site of the Daqingshan Secret Camp was not abandoned because of the cancellation of the Secret Camp. Wherever it is, the guards are now more stringent, and there are very few people who can enter and exit. Even people like You Yong and Shi Zhuang have never set foot anywhere.

However, this does not mean that the two of them don’t know some strange scenes.

In the past one or two years, the sound of thunder has always been heard in the blue sky and sunshine, and the surrounding people have regarded it as a strange phenomenon. The local people once reported to the government to ask for a look, but in the end they were suppressed.

It seems that this abnormal noise is related to what Zhu Yi is studying.

The two of them looked at the dozens of wooden bins outside the tent together.

"Inside?" The two asked Zhu Yi at the same time.

"The two generals seem to be impatient." Zhu Yixiao said, "Why don't we try the power of this thing today!"

Jindou Pass.

Amid the sound of warning horns, Cao Zhen walked up to the city tower and watched the Tang army in the distance line up again in front of the pass. After nearly a month of fighting, the more Cao Zhen was attacked, the stronger the confidence, and the Tang army was only able to stop it. When their stinking bombs were effectively restrained, they were helpless.

If you want to capture Jindou Pass, the Tang army has to fill it with their lives.

But so far, Tang Jun has not done so.

Of course, this does not mean that Tang Jun will never do this.

When another group of elite reinforcements arrived at Jindou Pass, Cao Zhen's confidence became stronger and stronger. Now there are 5,000 elite soldiers in Jindou Pass. The Tang army wants to fill in the life now. There are no ten times the casualties. They can't afford to capture Jindou Pass, but do they have so many people to fill in?

Even if there is, will the generals of the Tang army dare to fill it in?

If they don’t capture Jindou Pass, the Wuli Secret Gate will be their nightmare. It will be impossible for them to directly attack Tongguan’s city.

If Tongguan is not lost, Chang'an will be safe.

Cao Zhen did not know what was going on in Chang'an, and Cao Xuan did not tell Cao Zhen about Chang'an, for fear that this would affect the morale of Jindou Pass.

"Why do we just need to guard the King of Fathers for another ten days?" Cao Zhen looked at Cao Huan who was reinforced with some strangeness and said, "Not to mention ten days, even one month or three months, I can still defend it. After ten days, can we really give up Jindu Pass? If Jindu Pass is not allowed, how can we guard Tongguan?"

"Young Marshal, how could I know what Cao Shuai is planning?" Cao Huan smiled and said, "Anyway, we will do as Cao Shuai plans. In ten days, we will withdraw from Jindu Pass."

Cao Zhen frowned. Something must have happened. But his father didn't want to tell him.

But it doesn't matter. After ten days, everything will be clear.

The Tang army in the distance was busy setting up something, and Cao Zhen raised the monocular lens in his hand. This thing was also obtained from the Tang army. It cost a lot of money to get so many. However, it was indeed good things. After being pulled apart, things several miles away seemed to be in front of him.

"What is that?" Cao Zhen looked at the black iron guys in confusion, slowly raising his head.

"What is this?" Shi Zhuang and You Yong also looked at the guy in front of him with some confusion. No wonder when they came, there was a box in the carriage dragged by several horses. Now when they saw the soldiers installing him in place, each one was afraid that it would weigh thousands of pounds.

"This thing was named Cannon by Li Xiang!" Zhu Yidao.

"artillery?"

"Yes, this is the further use of gunpowder." Zhu Yidao.

"Shocking fire, swarming?" You Yong's mouth curled down.

The shaking fire, swarms, these are weapons destroyed by gunpowder, but they are not liked at all in the army. It is quite scary, but the lethality is really despised, especially the bullshit swarm, which ran around the ground after igniting it, and had no goal at all.

"It's completely different things!" Zhu Yi shook his head and said, "Thunder Fire, all the bees are all toys, not much different from fireworks, but this cannon is really a life-threatening thing."

"The bolt from the blue in the Daqing Mountains is what this thing is made of?"

"Yes!" Zhu nodded and said, "We think the power is very good, but every time Li Xiang looked at it, he scolded it as garbage, saying that such a cannon is not as useful as a catapult. So we kept improving it. Improve the formula of gunpowder and improve the casting of cannon barrels. For two years, this time, Li Xiang finally agreed to let us take to the battlefield to experiment, and said that it was finally better than garbage."

Looking at Zhu Yi who was a little depressed, Shi Zhuang and You Yong also had no great hope for this thing.

How good can something better than garbage be?

The two of them were interested in Lanshan.

"Wait a minute, I'll take someone with me!" Shi Zhuang said to You Yong.

Zhu Yi glanced at the two of them and pulled the corners of his mouth a little longer.

"Deputy Supervisor, calibrate immediately!" A soldier from the fire pig in the room called Zhu Yidao.

"I'll come in person!" Zhu Yi walked to a cannon, and worked hard for a while, squinted his eyes and gave a thumbs up, before saying: "Add the elevation angle by one point."

The entire ten cannons immediately raised the elevation angle according to Zhu Yi's instructions.

"Deputy Supervisor, use solid bullets or flower bullets?"
Chapter completed!