Just when the high-level of the Qin State sent planes to participate in the war, the Yan State finally took action. They will use poison gas for the first time.

"What's the weather like tomorrow? I'd like to know in advance. "Ju Xin came to the front line of the Yan army with a secret weapon. This front line is an open field. Only around the direction of the Qi army there is a small high ground more than a hundred meters high, this high ground is insignificant, but it can overlook all the surrounding situations. The movement of the Yan army's forces was under the control of the highlands.

And this area is right in the middle of the two weather stations in the Qin Kingdom. Therefore, the Qin State usually sends a meteorological team to measure the meteorological data here by the way. Ju Xin visited the meteorological control area of the Qin State. Eventually, the place was finalized with some high-ranking officers. Since this place is on flat ground, there are more people to defend it, and there are probably more than 2,000 Qi troops, and the rebel army jointly defends the area.

"Tomorrow's weather? Wait a minute, sir, I'll check it out for you. "Qin Jun's meteorological officer went to check the information.

"I'll see what the isobars are like." The weather officer said.

"Sir, is it the drama master who came to check the weather?" One of the deputies asked.

"Yes. Who knows what this adult thinks, he comes every day to ask about the weather. "The weather officer is a little annoyed.

"What's the weather like lately?" The weather officer asked.

"A ridge of high pressure passed. The weather is fine and it is perfect for flying. But we didn't have a mission. The deputy said.

"Well, it looks like this high weather is going to last for a few days." The weather officer said.

"I think so, though, there's a little bit of a breeze. Northerly. The deputy said.

"I see. I'll tell you about it. The weather officer casually took a copy of the weather information and said. It is clear that the weather officer is suspicious of coping. Because the meteorological observation stations of the Qin State need to be established a lot in order to completely unveil the mystery of meteorology, which is only initially established in the Qin State. And here, it's just terrible. The state of Qin only sent a platoon, about forty or so meteorologists. These personnel can only provide very limited meteorological information. And it's usually very uneventful, and there's a big risk of surprises. The good thing is that it is winter and spring. Just keep an eye on the situation in the north, and that's pretty much it. Especially the report from Xianyang.

Meteorologists in the Qin State gradually discovered that the cooling of the Qin State was mainly due to the oppression of the two same high-pressure systems in the west and the north. Considering the cold land of the north, they regarded it as a cold air. It was the presence of this gas that led to the cooling of the Qin State. This shows that the meteorological observations of Qin are still not very complete. And there's a lot of room for improvement. This is mainly due to the limitations of the transmission and understanding of meteorological data.

Meteorological data is usually calculated on a daily basis. If further away. It takes three to seven days. When these materials arrive. Often, meteorological phenomena have already occurred. It is precisely this kind of primitive data that gives Qin meteorology a solid cognitive process.

"My lord, here's the thing, the last time a ridge of high pressure passed not long ago, we are now in the range of high pressure control, and the range of high pressure control is usually sunny weather. Other words. The next few days will be good weather. The weather officer said with a very gesture.

"Oh, is it windy then?" Juxin asked.

"Wind. Yes, breezes, northerly winds. The weather officer said.

"What, what wind?" Ji Xin didn't know what this meteorological officer was talking about, what kind of high-pressure ridge or high-pressure control. He didn't even know. But just know that the weather is sunny and windy.

"Northerly winds. There is a good chance that it will be a northwesterly wind. The weather officer explained.

"Which direction?" Ji Xin asked excitedly. One condition has been met.

"That direction." The meteorological officer pointed in the direction of the Qi people.

"Okay, thank you, thank you. I'll be rewarded when I get back. Ju Xin said excitedly. Then excitedly left the weather station of the Qin State. The weather officer looked at the guy strangely.

"Sick." The weather officer said.

As he spoke, he took a bottle of soda and left.

The time has finally come to release the poison gas. It's finally here. Ji Xin shouted happily in his heart. I couldn't scream out, but I was excited enough. The power of this weapon was enough for a resounding success.

Ju Xin began to prepare secretly.

In the early hours of the morning, a team with very strange equipment walked into the position of the Yan army. They are wrapped in cowhide all over their bodies. Only two eyes are covered with a glass piece, and there is also a large metal disc in the position of the mouth and nose. It looked very scary, and many Yan soldiers looked at these strange troops blankly. They're even scarier than goblins.

And they did not hesitate to carry the cylinders into the position. Some were also holding strange metal tubes. These people were wearing chemical gas protective suits from the early Qin Dynasty, which did not play much role at all.

Only the activated charcoal component in that gas mask still has some effect. Qin's waterworks used not only chlorine, but also activated carbon. The filtration effect of activated carbon has been recognized by the Qin people, and the Qin people are very aware of the harmfulness of poisonous gas, so when they do chloride synthesis, it is usually carried out in a sealed space. But even this often leads to minor poisoning in some people. The reason for this is that some places need to be viewed manually. In order to avoid casualties, protective clothing that is very psychologically comforting but plays a small role has appeared.

One of the royal guards of the Yan army took on this burden, and many of them had seen the cruelty of poison gas with their own eyes, and many of them could not eat for many days after seeing it. There were also many people who asked to quit, but those who quit were killed. To prevent leaks. To comfort these people. Yan Guo ordered such a set.

With this kind of protection, these people are finally a little more stable.

"Listen, before the sun comes out, we're going to deflate." Ji Xin said protectively. With that, he left. The protective suit is stuffy. And I couldn't breathe.

Early in the morning, the sun had not yet come out, but some light had already appeared in the east, and a Qi soldier yawned to check the surroundings.

The sleepless night made the Qi soldier a little tired. He is very much like sleeping, but the leaders of the Qi army are very strict, and those who secretly sleep lose their heads in their sleep, this is the battle to defend the territory. The Qi soldiers controlled their tiredness.

"Let's see what's new." The Qi soldiers stepped on a mound of earth and looked towards the Yan position. This look made him sober up a lot.

The yellow-green mist slowly drifted towards the Qi army.

"I, we're wrong." The Qi soldiers rubbed their eyes vigorously with their hands.