Liu Chuang named the ballista Tianlei Huo, and the formula was kept strictly secret.

Not to mention Cao Cao, even if it is Liu Chuang's subordinates, not many people know the origin of this thunder fire. At the beginning, after Huang Chengyan handed over the formula of gunpowder, he accepted Zheng Xuan's invitation and devoted himself to compiling the Mengxue Hundred Family Names and the Three Character Classic. In addition to Liu Chuang, only Zheng Xuan and Zhuge Liang knew that this day's thunder fire was related to Huang Chengyan. The reason why Zheng Xuan invited Huang Chengyan to compile Mengxue was not to protect him. He learned about the gunpowder from Huang Chengyan himself, and he also realized the impact of the gunpowder.

After the gunpowder was made, Liu Chuang quickly opened a workshop in Xinchang, Liaodong, for production and processing.

And the person responsible for the production of thunder and fire on this day is Guan Hai.

The workshop is located in the wilderness of Liaodong, and no one knows its existence at all. After the thunder fire is made, it will be handed over to the Elk family trading house to be forwarded, which has gone through many twists and turns, and no one can figure out the real origin of the thunder fire and the production area.

Cao Cao asked Dong Zhao to explore the secret of the Heavenly Thunder Fire, and naturally he didn't gain anything.

Dong Zhao had no clue except for inquiring about a name.

Cao Cao closed his eyes, and after thinking for a long time, he brought Jia Xu over, "Wenhe, I don't care what method you use, and I don't care how much you spend, in short, I want you to figure out the origin of the heavenly thunder and fire for me, and try to get the method of making zuò, are you willing?" ”

Jia Xu was stunned, revealing hesitation.

This is a daunting task and extremely dangerous.

However, he also saw the effects of the thunder fire with his own eyes. Therefore, Jia Xu also knew very well in his heart that Liu Chuang introduced this day's thunder and fire into the battlefield. What kind of impact will it bring. If you can't do your best to figure out the secret of the thunder and fire. It will inevitably bring serious consequences.

Cao Cao handed this matter over to him. Instead of making Dong Zhao responsible, it also shows the difficulty of this matter.

Taking a deep breath, Jia Xu said softly: "If the lord wants me to preside over this time, Hugh wants to ask me, and Hugh wants to urge me...... In addition, I need him to help me by transferring Yuxue to my staff. If the lord can agree to my request, Jia Xu is willing to accept the matter. ”

Such a fetish. How could Liu Chuang not be guarded?

Cao Cao also knew that even if Jia Xu was to preside over this matter, it would be impossible to find the answer in a short time.

He said in a deep voice: "I will leave this matter to Wen He to preside, and I also ask Wen He to do his best." ”

"Whoa!"

Jia Xu, bow down to receive the order.

According to Cao Cao's idea, he withdrew from Anping and guarded the giant deer.

And after Liu Chuang won Anping, it was difficult to continue the offensive for a while...... Who knows, after Liu Chuang arrived in Xindu. And it didn't stop there. The first order he issued after entering Xindu was to let Zhang Liao, who was stationed in Qianqiu Pavilion, cross the river and attack.

Meantime. He also worshipped Shi Jian as a guerrilla general, and set off confidently to attack Boluo Pavilion along the river.

Cao Cao ordered Cao Zhentun's troops to block the mainland, but who would have thought that Liu Chuang's heavenly thunder fire was too powerful before, so that when Shi Jian put out the ballista, Cao's army began to rout. When Shi Jian attacked, even if Cao Zhen tried his best to command, he could not stabilize Cao's position.

But in fact, where did Liu Chuang get so much thunder and fire?

Hedong used it once, and Guanjin used it once, almost consuming the Heavenly Thunder Fire in his hand.

Although Xinchang Manufacturing Bureau began processing in Liaodong, in this era when science and technology are not developed, it is impossible to regenerate a batch of the same amount of Tianleihuo in a few months, or even half a year. This involves various aspects such as equipment and technology. In particular, the amount of various expenditures required to put the Heavenly Thunder Fire into use on the battlefield is extremely staggering.

After the Chinese ancestors invented gunpowder, it was only used to make fireworks.

Actually, there is no reason for this...... And what monarch is willing to invest huge manpower, material and financial resources to spend on this?

The emergence of black powder is indeed an epoch-making invention.

But black powder is not yellow powder after all, and he has a great shock and influence on this era, but when it comes to lethality...... It is still far from reaching the shocking level of later generations. In fact, Liu Chuang also knew very well in his heart that it was not so easy to turn black powder into yellow powder. And he didn't have the ability to make nitric acid explosives comparable to later generations. The use of black powder is far greater than deterrence. It can be said that once the formula of black powder is leaked, its deterrent effect will naturally weaken.

However, for the time being, the deterrent power of the heavenly thunder fire is still amazing.

Shi Jian killed all the way, and although Cao Cao ordered to resist, he couldn't stabilize the panic of the soldiers.

Liu Chuang, who is good at demon law, has the ability to call the wind and rain...... This also made Cao Jun up and down, panicking.

Every time he faced Liu Chuang's soldiers and horses, before they clashed, there would be an inexplicable fear. In this case, how did Cao Jun resist?

Of course, Cao Cao also discovered this problem, but he couldn't solve it for a while.

In fact, he also knew that Liu Chuang didn't have so much heavenly thunder fire in his hands, otherwise he would have a reason not to use it after a few battles?

However, it is one thing to know, and it is another thing to really face the attack of the Han army.

Cao Cao wasn't sure if Liu Chuang really didn't have the Heavenly Thunder Fire in his hands. If Liu Chuang uses it again, God knows what the ending will be.

"Retreat!"

After Cao Cao and Xun You discussed, they finally made up their minds to let go of the giant deer.

Lao Tzu can give you a peace, and you can give up a giant deer.

So, he ordered to abandon the giant deer, retreat to Handan, and garrison troops on the bank of Congtai.

It's impossible to lose two counties in a row, and it's impossible not to feel distressed...... But judging from the current situation, losing Julu and Anping is the best choice.

Handan, the capital of the ancient Zhao Kingdom, has a strong city wall.

Congtai is easy to defend and difficult to attack, which can defuse the huge threat brought by the thunder and fire.

More importantly, after Cao Cao retreated to Handan, the shortcomings of his excessively long grain route were eliminated. Similarly, after many wars, Anping and Julu are obviously insufficient. If Liu Chuang continues to go south, he will inevitably face a shortage of grain and grass......

"In my opinion, the giant deer is the limit of Chuang'er."

Xun You's expression was solemn. looked at Cao Cao and said, "But." If he still has the thunder and fire in his hands. It is also possible that the attack will continue southward. ”

Cao Cao sat on the Taishi's chair, twisting his beard and groaning.

"If he has heavenly thunder and fire, how can he abandon it?

When Zhang Liao besieged Game Tao before, if he had the heavenly thunder and fire in his hands, he would never have fought so hard.

At that time, as long as he took out the heavenly thunder fire to bombard a round, the gall pottery soldiers and horses would definitely collapse without a fight. Do you think there are enough soldiers and horses in your hands? When he was in Guanjin, he had already used all his strength. If he had heavenly thunder and fire, he would never keep it in his hand as an ornament.

So I made a bet with him. Bet that the thunder in his hands will run out......"

I have to say that Cao Cao gambles a lot.

Xun You was originally an assumption, and he actually didn't believe that Liu Chuang still had the Heavenly Thunder Fire in his hands.

Moreover, he was sure that the process of making thunder fire that day was not simple, otherwise why would he Liu Mengyan be so Yuan Shao before? After a few rounds of thunder and fire, with Yuan Jun's kind of urine, he would have collapsed without a fight, so why bother to fight for life and death?

Now that Cao Cao has made a decision, Xun You will not say more.

"What about Yuan Chang?"

Cao Cao was stunned for a moment, and immediately showed a bitter smile.

"I was able to hold my ground. It's not easy.

If Xun Youruo guards the Bumpy Mountain, he will be stationed in the Pi family. The road from Guanzhong to Hedong has been blocked.

Moreover, Ma Chao did not stop in Xiliang, and Zihe was able to block him in stability, but he was powerless to fight back...... Yuan Chang! As I said at the beginning, I asked him to hold out in Hedong for 15 days. If there is no change after fifteen days, let him decide, and I will not blame him in any way.

Now, fifteen days have come in the blink of an eye...... I believe that with Yuan Changzhi's wisdom, he will definitely be able to make the best choice. ”

What's the best option?

Cao Cao didn't say it, and Xun You knew it in his heart.

Zhong Xuan is a very smart person, he will never die lightly.

Moreover, he and Liu Chuang are still nominal nephews, and Yingchuan Xun and Zhong are also world friends, whether Liu Chuang or Xun Chen, how could they persecute Zhong Xuan to death? Zhong Xuan, after making a sufficient gesture, surrendered to Liu Chuang. There is no doubt about that.

But when this kind of thing is spoken, it always makes people feel uncomfortable and very comfortable......

+++++++++++++++++++++++++++++++++++++

In the middle of June of the eighth year of Jian'an, it was late summer.

The cool breeze in Baibo Valley was slow, and Zhong Xuan hiked to the top of the mountain and raised his eyes to look down the mountain.

He has been trapped in Baibo Valley for more than ten days...... There are still 5,000 soldiers and horses in their hands, but the food and grass are gone, and the soldiers have long had no intention of fighting again.

At the foot of the mountain, the Han army was blocked at the exit of the Baibo Valley.

Xun Chen personally led a large army and besieged Zhong Xuan.

He did not send troops to attack, and did not send people to persuade him to surrender, but only blocked the exit of the White Wave Valley. Zhong Xuan tried to break through, but before he could reach Taniguchi, he was shot back by a rain of arrows. In this regard, Zhong Xuan was also very helpless, he knew that his son-in-law had lost his morale.

In my mind, the scene of the Battle of Pingyang still comes to mind from time to time.

Even now, Zhong Miao has not figured out how he lost to the other party.

Although the Han army was strong and strong, he had 20,000 soldiers and horses, and even if he couldn't win the other party, it was not difficult to hold on for 15 days.

Who knows, a big explosion like the sky and the earth cracked, causing Cao's army to collapse without a fight.

Zhong Miao still remembers that the deafening explosion made him sit down and his horse was frightened, and he was torn off. If it weren't for the fact that his subordinate general Yang Wei desperately protected him from the encirclement, he would not be able to fight in Pingyang, and he Zhong Xuan would have become Xun Chen's prisoner.

To be honest, Zhong Xuan was very unconvinced.

But what's the use of not being convinced?

The deafening explosion, the billowing smoke, the pungent smell......

Even Zhong Xuan himself did not have the confidence to face the Han army again, let alone his subordinates to win the soldiers.

The fifteen-day deadline is coming.

Zhong Xuan was not sure in his heart that the five thousand soldiers under his command would resist desperately.

After three days of food deprivation, the sons and daughters have long lost their fighting spirit...... In this case, even if he Zhong Xuan has great ability, how can he resist the other party?

Thinking of this, Zhong Miao couldn't help but grit his teeth, and his face showed a look of embarrassment. (To be continued......)