Combining vertical and horizontal has always been the most practical and the best means of warfare.

It's just that when you're using means to plot against others.

Others are likely to be plotting against you as well.

The so-called praying mantis catches cicadas, and the yellow finch is behind, and it doesn't care about this.

The land of Hebei, east of Liaoshui.

Whether it is Goguryeo or the Goryeo people, they may never be able to change their nature of remembering to eat and not to fight.

Seeing the suffocating chaos of the Central Plains Dynasty, the king of Goryeo: Gao Jianwu's mind slowly became lively.

However, this life is a living fan, and he didn't suffer Yang Guang's loss before!

Now I want to take the opportunity to make some benefits, but I am afraid that I will be caught and rubbed on the ground again......

So after enduring it for several years, I recently made up my mind and decided to send troops out to test it.

The monkey stole rice and tried many times on the edge of Liaoshui, and when Gao Jianwu found that no one seemed to care about him, he raised his troops to cross Liaoshui with confidence and tried to encroach on the land west of Liaoshui.

(Insert a sentence here: the real Yang Emperor of the Sui Dynasty in history made three expeditions to Goguryeo.) Although both ended in failure, the real failure was only the first expedition, and the other two were judged to be failures by later generations because they did not achieve the expected strategic goals.

A conquest of Goguryeo, at that time the Sui Dynasty was the most powerful, and because of this, Yang Guangcai was arrogant, resulting in a major strategic mistake, so that the Sui Dynasty soldiers would lose millions, and there were countless ordnance and weapons!

However, even in the face of such a huge loss, the rich and powerful Sui Dynasty could still afford it! So soon, there was a second expedition to Goguryeo.

The process of the second conquest of Goguryeo was relatively simple.

Sui Jun learned the lesson of the last time, fought steadily, and immediately beat the stick and shouted dad and mother!

Just when the Sui army was about to capture Liaodong City and destroy its ancestral temple, Yang Xuangan, the son of Yang Su in the Sui Dynasty, suddenly took the opportunity to rebel!

This made Yang Guang have to give up the upcoming victory and hurriedly return to China.

Therefore, this defeat is only a failure to achieve strategic significance, and there is no reason for defeat.

And because the stick was so badly beaten this time, the third expedition to Goguryeo, before Yang Guang could send troops, Goguryeo was so frightened that he ran over and surrendered.

In this regard, Yang Guang, who was so happy, naturally accepted it happily.

However, there was a disagreement between the two parties in the matter of letting Gao Jianwu enter Beijing as a minister and pay tribute, so this time, it did not achieve the expected goal, and it was also judged to be a failure.

To sum up, this is the so-called third expedition to Goguryeo, and it ended without even fighting...... ）

Finding that no one cared about themselves, the ecstatic Goguryeo people set out from Liaoshui and marched all the way to the southwest.

In the beginning, they did take advantage of it, because the places they occupied were all poor and remote, and no one cared, so they succeeded, and this arrogance became more and more arrogant!

Until, their claws reached Dou Jiande's territory......

Who is Dou Jiande? That's definitely the No. 1 bull, or the kind that is really self-made and doesn't rely on anyone!

Generally speaking, people like this can't be provoked!

For example, Liu Bang, such as Zhu Yuanzhang!

Ruthless people like them may be able to tolerate the Han people attacking each other, but they will definitely not tolerate outsiders taking advantage of the opportunity!

In layman's terms, no matter whether the meat is in a rotten pot or a rotten bowl, it will always be their own!

But you want to reach out and want to get some chopsticks?

I'm sorry, not only the meat will not be given to you, but the hand holding the chopsticks will also have to be chopped off for you!

Goguryeo, who has always been sneaky in his work, never thought that they would face such a number one person!

As a result, they didn't say anything, they just arrived at the edge of Hebei, and they were immediately caught and cut by Dou Jiande, and the cutting was a miserable ......

A few Goryeo sticks, one by one, hated their parents for giving birth to two legs, and they were directly beaten and fled back to Liaodong, and they didn't dare to show their heads when they were killed!

In this way, Dou Jiande, who returned from victory, on the way back to the army, with the power of a great victory, swept away Luo Yi in Youzhou in one fell swoop.

At this point, Hebei, the land of Youzhou, was all owned by Dou Jiande, and the edge was unmatched for a while.

There are clouds in the book of war: the outside must be safe!

Now that the interior has been calmed, Dou Jiande has refocused his eyes on Li Tang and Wang Shichong.

So when Wang Shichong's letter of request for help reached him, Dou Jiande had already known about his battle with Li Shimin.

Rescue Wang Shichong?

This naturally has to be saved! After all, he is finished, and he will have to face the Tang Dynasty in full swing! The word "cold lips and cold teeth" is really not just talking!

To save, to save!

But how to save it, and when to save it? This is a very debatable question.

So when he received Wang Shichong's letter, Dou Jiande immediately organized his staff to analyze the current form bit by bit, and then gave Wang Shichong a reply.

As for what was written in the reply letter, what agreement did Dou Jiande and Wang Shichong reach in secret? I don't know anything about Datang here!

Even Xiao Han, who knew something about this, didn't have the heart to think about these "little things".

Instead, he wanted to learn from Wang Shichong and decided to build a hard shell to protect himself.

Inside the city of Luokou.

Under the uninterrupted work of tens of thousands of people day and night, it only took more than half a month, and a far more precipitous and taller city wall was firmly stuck in the mountain pass

The whole city wall is no more than a mile long, but it is more than three feet high.

The walls are all made of boulders and cement, and after they are built, they are smashed with a heavy hammer, except for a small pit, and even a crack in the fine lines cannot be found!

This level of solidity definitely surpasses that of most buildings in the world today.

"It's all watered, don't miss anything!"

A young team was walking atop a busy city wall, shouting and helping his men splash a bucket full of water down the wall.

Clear water flowed happily down the city walls, and the gray cement was stained with water, and immediately turned black-brown, and at the same time, its surface was like drinking water, and a series of small bubbles bubbled.

Seeing this magical scene, Cheng Yanjin immediately stopped and asked Xiao Han, who was walking in front, suspiciously: "Hey?" Xiao Han, what are you doing? Drink water to the walls"

Xiao Han didn't even bother to reply, rolled his eyes and said, "Drink water for the city wall?" Am I idle? Or are you crazy?! ”

"And what are they doing here?" Cheng Yanjin pointed to the soldiers who were still splashing water down, and asked Xiao Han strangely.

Xiao Han smiled, leaned to the side first, let a team of soldiers carrying buckets, and then said to Cheng Yanjin: "This is because the weather has been too hot recently, and I am afraid that the cement on the city wall will crack if it dries too quickly, so I have to splash water!" Hey, aren't you going out to pacify the surrounding area after the city wall is repaired? Why don't you do it yet? ”