Ma Jun said: "Therefore, in order to maintain this horn momentum, the Yuantai people will launch an attack on Qishan Pass after resting!"

Feng Hanzhao said: "This is a heavy burden!"

Zhen Zhen was a little unconfident in himself at this time. It took time for her to come up with a psychic battle, and now she wasn't sure if it was on her side. Can the rumors she hopes to spread as soon as possible reach Yuantai in time? Can it play a role in Yuantai's decision-making? Everything is unknown, and this uncertainty is really tormenting.

Feng Hanzhao noticed Zhen Zhen's face and said, "Let's go down." Feel free to report any situation. ”

"Yes. Your Highness. Ma Jun solemnly handed over his hand and sent Feng Hanzhao and the others away.

Walking to no one's place, Feng Hanzhao held Zhen Zhen's hand and said, "The first time I see a dead person on the battlefield, I will definitely be uncomfortable."

"Is it that obvious? I thought I was covering it up pretty well. Zhen Zhen said, "When have you seen it?" ”

"When I was in Dazhou, when the prisoners were executed after the autumn, my father asked me to sit next to the prison officer and watch. The knife fell in his hand, and the bright red blood could spray a foot away. Feng Hanzhao said.

"Don't you have nightmares?" Zhen Zhendao.

"Those people have done many evils, and they have died innocently. Why should I have nightmares for them? Feng Hanzhao said, "The moment the Yuantai people hit Qishan Pass, they are no longer ordinary people. He is an enemy who may invade Daning in the future and plunder the people. We have to find a way to stop him. And among these methods is to hurt him so that he can no longer continue to do evil. Although our methods are very violent, morality is on our side. ”

"There is much help for the righteous, but little help for the unjust." Zhen Zhendao.

"Yes, that's what it means. It's not the killing we provoked, we're just fighting back in self-defense. ”

"I feel better after hearing what you say. I just saw that it was also a life, and if I had withdrawn earlier, there would not have been so many casualties on either side. ”

"No one has a rule that says you have to succeed the first time you do something. The first time you go into battle, it is a victory to survive. ”

"What does the emperor mean exactly? I really can't think of how this way of retreating can be feasible. Look at the method we came up with a few days ago, it won't be immediate! How long will it take for it to reach Yuantaide's army and cause them a disturbance! Could it be that I am going to take a loudspeaker and shout at Yuantai? There is no electricity again. Zhen Zhen said annoyedly.

"What is a horn?" Feng Hanzhao asked.

"It's a thing that shapes like that." Zhen Zhen casually picked up a branch and drew a horn on the ground. As soon as the hand slipped out, the shape of the drawing was not very good, so I drew another one next to it.

"It looks simple, but what's the use?" Feng Hanzhao asked again.

"You can amplify the sound. But what needs to be used is an electromagnetic induction device. Zhen Zhen looked at the two speakers on the ground and had a whim, "Hey, wait, maybe you can try it without electricity." For example, try stringing together several horns. Zhen Zhen remembered that the physics teacher introduced a sonic experiment---- connecting more than a dozen hand-held amplifiers end to end, and the sound emitted could shatter glass. Zhen Zhen drew a lot of trumpets connected together on the ground and explained the principle to Feng Hanzhao.

Zhen Zhen said: "The horn I want to make now doesn't need to shatter the glass, it only needs to transmit the sound from Qishan Pass to the Yuantai military camp." The principle of loudspeaker amplification is very simple, but it is a technical job to make it. What material to use, thickness, size, all have to try. ”

Feng Hanzhao asked, "What are you going to do it with?"

Zhen Zhen said: "Use iron sheets, or something similar." Made of paper, too soft. ”

Feng Hanzhao called a soldier from Qishan Pass: "Where is the nearest blacksmith shop here in Qishan Pass?"

The soldier said: "There is no Qishan Pass, and I have recently had to go to Qishan County to have a blacksmith shop."

Feng Hanzhao called his guards again: "Go to Qishan County immediately and invite all the blacksmiths in the county." Then Feng Hanzhao called someone to tell Ma Jun again, and finally went back to his residence to gather people.

Zhen Zhen only found out at this time that Gonggong Cao was not in his house, so he left a message and immediately followed back to Qishan County.

By the time they arrived at the county office, three blacksmiths had already arrived. Zhen Zhen didn't talk nonsense, and directly said what he wanted while drawing: "Can you make it out of iron sheets?" Also, because the sound needs to be transmitted very far, it is necessary to install a tin cylinder between the horn and the horn. ”

The blacksmiths quickly understood what Zhen Zhen meant, and they all said that they could give it a try.

"Then you can go back and do it now, and bring me the sample when you've made it." Zhen Zhen arranged, and gave each family a silver ingot.

The blacksmiths were afraid that they would miss the big business sent to the door, and as soon as Zhen Zhen finished eating on the front foot, the three blacksmiths on the back foot sent the samples over.

Zhen Zhen looked at it, it looked like there was no problem, the key was how to ensure that the sound could be transmitted. Let's discuss making a smaller one first, and install it on a tree or roof to see the effect.

Zhen Zhen chose the largest blacksmith workshop to take the lead, and the three jointly developed it, so that no one would suffer.

Feng Hanzhao's guards were all sent to the blacksmith shop to help with the hard work.

The next day, a horn was erected on the roof. Zhen Zhen sat in the room, talking to an empty pipe, and the sound was smoothly transmitted along the pipe from the loudspeaker on the roof. But the sound could not be heard for a mile or so. This distance is clearly not enough.

Fortunately, the blacksmiths have figured out the way and are trying to improve it. Three days later, when the experiment was carried out on the gate building of the county seat, it was simply empty, and everyone came to see this huge iron shell, a thing called a trumpet.

Zhen Zhen spoke two miles away---- all the iron sheets were only enough to do so long---- she had already thought about what she said: "Fathers and elders of Qishan County, sisters, Yuantai people are once again sharpening their knives and trying to rob our harvest of grain. Every grain of rice here is planted by our Daning people, why give it up! Fathers, fellow villagers, sisters, I hope everyone will unite and not be afraid of the attack of the Yuantai people! Young and old! Let's join the battle to defend Qishan Pass and protect our homeland together! ”

A long, long time later, the people of Qishan will recall this voice that resounded over the county with their children and grandchildren, and proudly said: "The queen mother was just married to the emperor and became the crown princess." Only a teenager, not afraid of death at all, the voice is sweet and crisp, sonorous and powerful, after listening, people can't wait to rush to Qishan Pass to beat the Yuantai people away. ”

The blacksmiths made the loudspeaker detachable, and two days later, it was reinstalled next to the beacon tower at Qishanguan.

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