Otherwise, once the method of saltpeter ice making spreads, everyone's efforts during this time will be in vain......

But the people are not unaware of it, and when some people pass by the vicinity of the mansions of the adults, they will feel a refreshing coolness coming from the whole body......

It's like walking outside on a 40-degree day, and suddenly passing by the door of a bank or a store, and the cool breeze of the air conditioner is blowing in your face...... It feels like two words, comfortable!

However, the people can only feel the coolness, and they don't know why it is so cool, and most people think that it is a high-end product imported from 'abroad' by the adults, which can cool down, and they think that they can't afford it.

Therefore, they didn't think much about it, but some traders from other countries were very surprised and asked questions, but they couldn't get results.

After that, a strange phenomenon appeared in Chang'an City......

During the day, people were reluctant to go out because the weather was too hot. But now, many people are keen to go out, and they don't do anything when they go out, they just sit around the mansions of the adults......

This kind of behavior is roughly equivalent to modern aunts and uncles going to supermarkets, banks and other public places to rub air conditioners......

Anyway, there are roads around the officials' mansions, and they sit or stand next to them, and they don't break the law, and they can still be cool, so why not?

When the empress and the ministers learned the news, they couldn't laugh or cry, and after thinking about it again, they decided not to care. It doesn't matter anyway, as long as you don't expose saltpeter ice.

After all, this method will definitely not last long, and what we can do now is to hide it as much as possible, and then pit Chen Guo and Wu Guo for a wave......

......

Southern Chen, Qingbei County.

It is said that it was not originally called this name, but back then, the ancestors of Chen Guo wanted to conquer the northern part of the Tang Dynasty, and even almost succeeded, so that it could be changed to Qingbei County.

Take the meaning of purging the northern part of the Tang Dynasty.

The Tang Dynasty and the Chen Kingdom face each other from north to south, separated by an endless mountain range, which is a natural barrier.

If it weren't for this towering, endless, and demon-infested mountain range, the two sides would have fought for so many years, and it would definitely not be the situation that it is now.

Qingbei County shook the southern city, and Chen Guo built a 'war fortress!'

It is not difficult to guess from the name alone that this city was built entirely for the south, and the south is naturally the northern part of the Tang Dynasty!

This city is that there are no civilians, all of them are soldiers of the Chen Kingdom, but even so, there are hundreds of thousands of people in the city!

A small part of them are logistics personnel, most of them are combat personnel, and if the situation is urgent, logistics personnel can also go to the front at any time!

The individual strength of Chen Guo's people was much weaker than that of the Tang Dynasty, so it was often possible to defeat the Tang Dynasty with many more troops.

But even if the total number of troops in the northern army of Datang Town is less than 50,000, and the number of soldiers who guard the town at all times is no more than 30,000, and they have hundreds of thousands, they have not taken advantage of it for so many years.

Among them, the strength of the Tang Dynasty soldiers is one reason, and the other reason is that the mountain range between the two countries limits the strength of the army!

In the mountains and mountains, the military formation or something, it can't be used at all, more often, it is personal force, but personal force Chen Guo is far inferior to Datang, so for so many years, it has been dragged.

The state of Wu borders both the state of Chen and the Tang Dynasty, a small part of which is in the northern part of the Tang Dynasty, and the other part is in the western part of the Tang Dynasty.

Due to the vast land and resources of Datang, the two countries have always wanted to conquer Datang, seize cities and land in Datang, and expand their own national territory.

In the eyes of Chen and Wu, the land of Datang is vast, and the land is vast and sparsely populated, if it can be grabbed, it can grow a lot of crops, domesticate animal husbandry, etc., and it is definitely a rich land.

But in the eyes of the two countries, the people of the Tang Dynasty are all guys who only have 'muscles' in their heads, and they will not use such a large land to guard it, but they are living in extreme poverty......

In the spirit of humanitarianism and the spirit of 'shameful waste', the two countries had no choice but to join forces after years of war and the situation that they could not win the Tang Dynasty.

Let's join hands to fight together, and the land that has been beaten down will be distributed according to the merits!

So much land, in the hands of a group of women with only muscles in Datang, it's too wasteful, or let us run it better, isn't it?

On this day, in the southern city, Chen and Wu had several strategists gathered here.

"According to our intelligence, the weather in Datang is already extremely hot today, although it is not yet the peak, but it has also reached the point where every household is reluctant to go out, our opportunity has come!"

"Yes, according to my information, Datang is much hotter than ever before this summer, and it is our best chance!"

"Those southern barbarians, I guess they thought that we would be the same as in the usual summer, and the two sides would tacitly truce, and only fight a few games once in a while, right?"

"Hey, isn't that just right? This time, it's a lifelong lesson with the Southern Barbarian, if it goes well, maybe you can directly capture Chang'an City, enter the Tang Dynasty, and let the Tang Dynasty disappear from now on!"

"Don't be too optimistic, it's too difficult to capture Chang'an, after all, there is the sixth martial artist in the world, and when she reaches her level, one person can block thousands of troops and horses......"

"Hmph, no matter how powerful Wu Zetian is, can he still kill hundreds of thousands of our horses? But it is indeed unrealistic to capture Chang'an. ”

"These native-born Southern barbarians can't stand the ghost weather of the Tang Dynasty, and if we enter the territory of the Tang Dynasty, the soldiers will inevitably be even more unbearable!"

"Therefore, our main goal is to crush the northern defense line of the Southern Barbarians and completely annihilate the Northern Army!"

"As long as this is done, Datang North will be hired by us!"

"That's right, according to my observations, the last few days have been sunny and there will be no rain, which means that we can wait a few more days. When the temperature reached its highest, those southern barbarians couldn't stand the heat, so they suddenly attacked and caught them off guard!"

"Okay! This time my Wu country will cooperate with your country, and it will definitely work in one fell swoop, at least, we must also clear the northern part of the Tang Dynasty!"

The strategists of the two countries decided on a strategy, and then decided to attack the whole army at noon three days later!

In fact, in the summer in the north of Chen Guo, the temperature is not much lower, but it is a few degrees lower than that of Datang.

Therefore, in the past summer, both sides would tacitly agree on a 'truce', but the Chen State, which had a lower temperature, would launch several wars from time to time to consume the strength of the Tang Dynasty.

But this time, the two countries joined forces and decided to launch a general offensive in the most difficult summer of Datang, with a total of more than 500,000 troops, attacking Datang!

However, what the strategists of the two countries didn't know was that when they were 'planning', all kinds of materials were constantly being sent in the military camp of the Northern Army in Datang Town......