Tongguan, Cao Xuan is already working on the retreat.

Half a month, at most half a month here, he decided to leave.

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

And the most critical step in defending Tongguan City is to defend the Jinqiu Pass, for which Cao Xuan sent another thousand people to Jinqiu. And these thousand people belong to Cao Xuan's own personal guards.

On the tenth day after Zhu Youzhen left Chang'an, when You Yong was repeatedly unable to conquer Jin Steep Pass, and was a little helpless, Zhu Yi, the deputy capital supervisor who would be the supervisor, led a group of people to Tongguan.

Zhu Yi, in the secret camp of Daqingshan, belongs to the room fire pig.

This is a special force. They are not good at fighting, but they are all ingenious, and they have some crazy ideas that ordinary people can't reach. Li Ze's cultivation of them was different from the rest of the secret camp that either focused on fighting or focusing on tracking and spying on assassination, and this group of people was undoubtedly the most knowledgeable group of people in the secret camp.

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

Whether it is the development of military bombs such as fierce fire bombs, or the invention of civilian weapons such as hydraulic hammers, they all come from this organization that has never been known to outsiders.

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

Even in the now recognized Wuwei Academy, in all these aspects of research, it is far behind them. And with the rise of many detailed classifications of various subjects in Wuwei Academy, the main direction of attack of the chamber fire pig has gradually shifted. They now specialize in the military-industrial side. The original civilian talents and scientific research achievements were basically transferred to Wuwei Academy. The rest are some things that are not suitable for public disclosure and are extremely confidential.

Zhu Yi is chubby.

Unlike the other friends in the secret camp, both men and women are brave and fierce, he is always smiling, because he rarely exercises, he is white and fat, and he looks very happy.

But whether it was You Yong or Shi Zhuang, they were very polite to him.

Because this dead fat man who looks like he is smiling at Mimi, the things he got out are really unusual. The purified fierce fire oil bomb came from him, and this thing has been too helpful to Tang Jun over the years.

"Deputy Supervisor Zhu, the Golden Steep Pass is completely constructed of hard stones, and it is extremely special, and the fierce fire oil bomb has been used many times, and the enemy has roughly figured out its characteristics, and there are some special methods to deal with it, which makes us in the Jin Steep Pass, even if we use the fierce fire oil bomb, the effect is not significant." You Yong said to Zhu with some worry. "Now that Li Xiang has arrived in Luoyang, I don't have much other way but to use human lives to pile up. General Shi is ready to go into battle shirtless. ”

Zhu Yi smiled and glanced at Shi Zhuang and said, "In this weather, if General Shi goes to fight with his bare arms, he is afraid that it will be very cold." ”

"It's not cold, it's not cold!" Shi Zhuang clenched his fists and said, "It's hot and tight to slash, think about it, when the knife goes down, the hot blood splashes on the body, how can it be cold?" ”

Zhu Yi shuddered, and waved his hand again and again: "It's too brutal, it's too brutal, don't tell me about such a thing." ”

Brutalize your mother's ass!

Shi Zhuang scolded in his heart, if there is really a king of Yama in this world, on the account of his old man, the account under the name of your Zhu Fatzi is only afraid that it is many times more than the account in the name of my Shi. Lao Tzu kills people, one knife and two cuts, one by one, you kill a dog, it is a piece of killing, and none of the people who die die happily.

"What good things did Deputy Supervisor Zhu bring us this time?" Shi Zhuang didn't think so, but his face was still full of smiles, for these generals who led the troops to fight, people like Zhu Yi really had to be supplied.

"I did bring a few things." Zhu nodded and said: "It's not too mature, experiment, this time bring it to the battlefield to test the water and see how the effect is?" ”

"Does Li Xiangke know?" Shi Zhuang asked.

"Childe knows, but what he made before, Childe has always been dissatisfied." Zhu Yi sighed, "Actually, in my opinion, it's already very good, but every time I am told by Gongzi that it is useless, I have changed it for nearly two years for this thing." ”

You Yong and Shi Zhuang glanced at each other, "What are you studying at the former site of the Daqing Mountain Secret Camp?" ”

"yes!" Zhu Yiyi.

The old site of the Daqingshan secret camp has not been abandoned because of the cancellation of the secret camp, where is the current guard is more stringent, and there are very few people who can enter and exit there, even people like You Yong and Shi Zhuang have never set foot anywhere.

However, this does not mean that the two do not know some visions somewhere.

In the past one or two years, the sound of thunder has been heard in the blue sky and white days in Daqingshan, which is regarded by the surrounding people as a vision of heaven and earth. The local people once reported to the government to find out, but in the end they were suppressed.

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

The eyes of the two looked at the dozen or so wooden compartments outside the big tent.

"Inside?" The two asked Zhu Yi in unison.

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

Golden Steep Pass.

In the sound of warning horns, Cao Zhen walked up to the city tower and watched the Tang army in the distance once again line up in front of the pass. It's been almost a month since they fought, and the more they beat Cao Zhen, the stronger their confidence became, and the Tang Army couldn't stop at it, and when they were effectively restrained by fierce fire and oil bombs, they were helpless.

If you want to capture the Jinqiu Pass, the Tang army has to take your life to fill it.

But so far, the Tang Army has not done so.

Of course, this does not mean that Tang Jun will not do this all the time.

When another batch of elite reinforcements arrived at Jinshu Pass, Cao Zhen's confidence became stronger and stronger. Now in the Golden Steep Pass, there are 5,000 elite soldiers, the Tang Army wants to fill it with their lives now, there are no ten times the casualties, they don't want to capture the Golden Steep Pass, but do they have so many people to fill in?

Even if there were, would the generals of the Tang Army dare to fill it in?

If they don't capture the Golden Steep Pass, the Wuli Secret Gate will be their nightmare. It would be impossible for them to directly attack the city of Tongguan.

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

Cao Zhen didn't know what happened in Chang'an, and Cao Xuan didn't tell Cao Zhen about Chang'an, for fear that it would affect Jin Qianguan's morale.

"Father, why only do you want us to keep it for ten more days?" Cao Zhen glanced at Cao Huan, who had come over with reinforcements, a little strangely, and said, "Don't say it's ten days, it's a month, three months, and I can hold it." Ten days later, is it possible that we still really give up on Jin Steep Pass? Don't want Jin Steep Pass, how to guard Tong Pass? ”

"Young marshal, how can I know Cao Shuai's calculations?" Cao Huan smiled: "Anyway, let's just do what Cao Shuai wants, and after ten days, we will withdraw from Jinshuguan." ”

Cao Zhen frowned, something should have happened. But my father didn't want to tell me.

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

In the distance, Tang Jun was busy setting up something, and Cao Zhen raised the monocular in his hand. This thing was also obtained from the Tang Army. It took a lot of money to get so many of them. But it's a good thing, and when you pull it open, it's as if you're in front of you.

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

"What is this?" Shi Zhuang and You Yong also looked at the guy in front of them with some confusion, no wonder when they came, there was such a box in the carriage dragged by several horses, and now they see the soldiers installing him in place, each of them is afraid that it weighs thousands of catties.

"This thing was named artillery by Li Xiang!" Zhu Yiyi.

"Artillery?"

"Yes, that's a further use of gunpowder." Zhu Yiyi.

"Shocking fire, a swarm of bees?" The corners of You Yong's mouth twitched down.

Shocking fire, swarming, these are weapons destroyed by gunpowder, but in the army, they are not liked at all. It's scary, but the lethality is really despicable, especially the swarm of shit, which is all over the ground after igniting, and there is no goal at all.

"It's two different things!" Zhu Yi shook his head again and again and said: "Thunderbolt fire, a swarm of bees, it is all toys, not much different from fireworks, but this artillery is a really life-threatening thing." ”

"The thunderbolt on a sunny day in the big green mountain, is this thing made?"

"Yes!" Zhu nodded and said: "We think the power is very good, but every time Li Xiang sees it, he denounces it as rubbish, saying that such artillery is not as good as a trebuchet." So we're always improving. Improving the formula of gunpowder, improving the casting of artillery barrels, two years, this time, Li Xiang finally agreed to let us go to the battlefield to experiment, and said that it was better than garbage. ”

Looking at Zhu Yi, who was a little melancholy, Shi Zhuang and You Yong didn't have any hope for this thing.

How good can something be better than garbage?

The two of them were in high spirits.

"Wait a minute, I'll bring someone on it myself!" Shi Zhuang said to You Yong.

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

"Deputy superintendent, calibrate now!" A soldier from the room fire pig to Zhu Yiyi.

"I'm here myself!" Zhu Yi walked to a cannon, where he was squinting and thumbs up for a while, and then said, "The elevation angle will be raised by one point." ”

The entire ten guns immediately raised the elevation angle according to Zhu Yi's orders.

"Deputy Supervisor, do you use solid bullets or blooming bullets?"

Zhu raised the monocular in his hand, glanced at the dense Liang Jun in the distance, and smiled slightly, like a poisonous snake spitting out a letter: "So many people, of course, use flowering bullets." ”