In fact, throughout the ages, there has been an emperor who did not want to expand his territory.

However, this is not a simple sentence.

Li Er then asked Li Chong how to attack Goguryeo.

Yi Chong asked him if he knew the importance of Goguryeo.

The country of Goguryeo, from a small county town in the Western Han Dynasty as the basic plate, may have a population of only 20,000 or 30,000 at the beginning, and has grown to 3 million now, which is one-fifth of the registered population of the Tang Dynasty.

It can be seen that this country is awesome.

To conquer such a country, Datang had to spend 25 years.

Li Ji began fighting Goguryeo at the age of fifty-one and fought until he was seventy-six years old.

And, a year later, Li Ji died of illness in Chang'an.

This is Goguryeo.

Of course, Li Er doesn't know much about Goguryeo now.

But......

When Li Zhong told him this, he would be clear.

I thought it was just a country that could be destroyed casually as long as I worked hard, but now the reason why I haven't done anything to it is because I can't look down on it for the time being.

Outcome......

Unexpectedly, this bone is quite hard.

Li Chong said: "That is, in the past 25 years, Tubo has learned some advanced culture of the Central Plains, coupled with these 25 years of recuperation, the population of Tubo has also developed to the point that it is estimated that there will be 10 million people in later generations, of course, this number is only a speculative number, but I think that no matter what, there must be a population of four or five million."

"There are too many enemies to consider in the Tang Dynasty, whether it is Tubo, Tuyuhun, or Western Turks, as well as Goguryeo, and there is also a Xue Yantuo in the north."

When Li Chong said this, Li Er's heart also sank like a plumb sinker.

But fortunately, these forces were not so strong in the same period, but became so strong one after another.

Li Er: "So your proposal is to take Goguryeo first?"

Li Chong: "It would be best if we could win it first. If you take it, you can still contain Xue Yantuo, Shen Ya, Xi and other tribes together."

Li Er: "But you also said that you have been fighting for twenty-five years. In the end, it will not use troops, or what, a small country, it will take twenty-five years?"

Li Er was puzzled, it must be that after his death, there was no one in Datang.

In order to figure out this state, Li Er had to ask, "Have I ever fought Goguryeo?"

Li Chong said, "I fought once, and it was your own recruitment."

Li Er didn't expect that he would even fight.

Li Er: "What about the results? Lost?"

Li Er said, how could he lose?

Li Chong said, "I didn't lose, but I didn't win either. You took 100,000 men to fight, and you took more than 100,000 prisoners back. But the intended goal, the destruction of Goguryeo, was not achieved."

Li Er: "Why hasn't it been realized?"

Li Chong: "The weather is cold, the food and grass are about to run out, and the city is too difficult to attack, so we have to withdraw our troops. On the way back, you fell seriously ill, and then you began to take pills, and eventually, coupled with the dissuasion of the ministers, Goguryeo did not come down after your death. I have to leave it to the rest of the people to do it."

Li Er: "You can take it down if you go?"

Li Chong: "No, you didn't ban my experiment, I don't know if it will work, I have to try it first."

Li Erxin said, "Your hot air balloon is really good for reconnaissance, and if it is paired with a telescope, the effect will be even better." It's a pity that he can only fly in the sky for two quarters of an hour, and he can't control the direction of flying. With that, you think you can attack Goguryeo?"

Li Er suddenly thought, "If it's a few hundred and sneak attacks at night, maybe it's really okay. But it's easy for you to fly into the palace, so Mowgli may let me ban it."

Li Chong knew that Li Er was a smart person, and of course he knew the role of hot air balloons.

It's just that now the enemies of the Tang Dynasty are all nomads, and you are developing this now, except

Storm the palace, who else can you fight.

That's why hot air balloons are banned.

You were born at the wrong time.

And this thing, when facing nomads, is definitely not very useful.

However, now that he heard Li Chong say that the city was too difficult to attack, Li Er seemed to understand all this.

Li Er: "Then why don't you explain to me? If you give your reasons, do you think I won't listen to you?"

Li Zhong took a deep breath, and then replied, "I just think the time has not come, and the reason for doing this is to let the prince take a hot air balloon and take a telescope to see what the crown princess looks like. When the time comes, fly over the crown princess's house, and the crown princess will definitely come out to see."

Li 2: "......"

Li Chong: "If you don't look good, then you don't want this princess."

Li 2: "......"

Li Chong: "To tell the truth, this crown princess, there are not many deeds about her in the history books, I don't know if it's good or not. But...... I must hope that the crown prince will marry a virtuous helper."

Li Er's face, you don't need to explain, what kind of internal help are you, you only look good or not. Virtuous or not, I don't think you care at all.

Li Er: "You don't have to explain. I know you only like good looks."

Li Chong: "Isn't this normal? It's a man who likes to look good."

Ill-intentioned!

And the crown prince actually followed him to do such a thing.

Seeing Li Er, it seemed that there was some misunderstanding.

Li Chong said, "The prince righteously refused my help to him. Is trust between people so fragile? I said okay, wait for a few more tests, and make sure that there are no accidents, so let him ride, he still feels uneasy. It's a pity that it's not me who got married, otherwise, even if I go over the wall, I have to see what it looks like. Otherwise, the marriage will not be secure."

Li Er rolled his eyes at him, "Okay, I don't want to hear you say this. Since hot air balloons have such a big effect, let's continue experimenting."

Li thought for a while, "In the future, the palace guards should pay attention to the sky."

Originally, they were very tired on duty, but now they have to pay attention to the sky at all times, and Li Chongdu feels pity for them.

Li Er was puzzled.

Li Chong explained: "This thing actually has no technical content, I can do it, others can do it, if others want to float into the palace to kill you, then I can only say that I can't stop it." And...... Once I experiment more, others will know more, and sooner or later, this technology will be known to everyone. This thing has been studied, to tell the truth, the harm to Datang may be much greater than the harm to other forces. Even...... If you learn from the Turks, Xue Yantuo, and Tuyuhun, the border towns of the Tang Dynasty will be even more dangerous."

After Li Zhong finished speaking, he said, "Of course! It can't be said that this thing is invincible. Anyway...... This is like a double-edged sword, which can not only look at the crown princess and fight Goguryeo, but also put a certain amount of pressure on the sky of the Tang Dynasty. And it must be more pressure on our Datang. Other nomads, they don't have cities."

Li Er looked at Li Chong, and finally asked, "Then you still make it?"