Three Kingdoms: Cao Cao, please answer the question!

Yizhou now has [-] soldiers stationed in Zangmao. If Yizhou attacks, Jia Xu has already made up his mind to give up half of Yizhou to Wuling.

"It is indeed difficult to face Yizhou and Jiangdong at the same time."

Jia Xu was in Jingzhou, but he didn't know that the envoys sent by Sun Quan had gone north along the coast, intending to persuade Gongsun Kang and the Xiongnu and Xianbei in the north.

If Sun Quan can really do it, the pressure on Cao Cao and him will increase greatly.

Even if Cao Cao's power is so powerful now, he can't resist enemies from all directions.

That will be a great crisis that can destroy Cao Cao's power.

……

Chapter 177 Maps!

Cao Cao originally thought about visiting the Western Regions in the future, but he didn't expect that the reward for answering the questions would give him a map first.

That's right, the people in Hefei City answered this question correctly, and the reward for the correct answer is a map.

However, this map is very simple, and only draws the approximate territories of the various countries.

The big man occupies a lot of space on the right side of the map.

The north is the territory of Xianbei. After defeating the Huns a hundred years ago, Xianbei became the largest alien race in the northern grasslands.

The northern Huns were driven to the west, and once deterred the small western countries, but then the Han Dynasty sent troops to destroy them.

The Huns had no choice but to go further west, and with the development of hundreds of years, they became the Huns, which led to the demise of the Roman Empire.

There are still many small countries in the south of the Han Dynasty, which is nothing to worry about.

The west is the Faqiang country, which occupies a huge area.

The Han Dynasty once sent people to explore the plateau area occupied by the Faqiang Kingdom. The Faqiang Kingdom is all highlands, and people who go there will die inexplicably (altitude sickness).

That's why Liangzhou is a long one, in order to avoid these highlands.

Further west is the Guishuang Empire, the Parthia Empire, and even the Roman Empire mentioned.

Looking at the whole picture, the Han Dynasty is not considered big, which aroused Cao Cao's ambition.

"It would be great if all the places on this map were the territory of the big man!"

Guo Jia said: "Then wish the prime minister realize his wish as soon as possible."

The field of answering questions finally dissipated, and the sky could be seen again.

It was midday and the sun was shining brightly.

In a few days, most of the remaining chill of winter has melted away, and even the north wind blows without shivering.

Jiang Ji's concrete has become very hard after initial solidification, although it does not look good, it is irregular.

"Prime Minister!" Cao Cao invited by Jiang Ji came to see.

Cao Cao stood in front of the concrete, drew his sword and slashed at it.

The Qinghong sword went deep into the concrete, which made Jiang Ji a little embarrassed, because the concrete was not as hard as stone as expected.

But Cao Cao thought it was enough.

He said: "This kind of hardness can already resist most attacks. The concrete is liquid at first, and it can be formed by pouring. It is much simpler than building a city with stones."

Cao Cao looked at Dian Wei who had been following him all the time, and asked him to try it too.

Dian Wei took his halberd and chopped down, but not as deep as Cao Cao.

Cao Cao snorted and picked up the broken concrete block. The place Dian Wei cut was mixed with many other things, just some thatch that ignited the fire.

But it is clear that only thatch is added, but the hardness here feels much higher than other places.

"How is this going?"

Dian Wei rubbed his head, and suddenly said honestly: "I also add thatch to the clay when building a house in my house, so that the clay will not collapse, and it will be stable."

Although Cao Cao is knowledgeable and knowledgeable, he still doesn't know about this kind of thing.

However, Dian Wei was born in poverty and built a house by himself. This is actually common sense among the people.

Clay is so weak that you can break it apart with your hands. How can you build a house with such a thing?

But you can mix it with other things, such as bamboo sticks or wooden branches, to make the clay wall more stable, and adding dry grass can make the clay more compact.

But no one really knows how it works.

Add grass to the clay, and when you break it, it's like tearing the hay.

One piece of hay is nothing, of course, but what about ten or a hundred?It is estimated that it is difficult to destroy a cow.

Cao Cao noticed this, and said to Jiang Ji: "In the future, some hay will be added to the concrete."

"Yes!"

The matter of concrete is not instant, and it will take at least half a year to build a concrete city wall.

So Cao Cao didn't ask Jiang Ji to make concrete, and now there are more important things.

"There are more than two thousand Liannu in the army, your task now is to transform them."

Jiang Ji got the method of making Liannu. Compared with concrete, the upgrading of armaments is obviously more important.

Cao Cao, who had given all his orders, was not idle, and sent someone to send a letter to Jiangdong to arrange what Guo Jia said was the backhand.

In addition, people were sent to mobilize the army.

In the process, a large army in Jiangdong was ready to go.

With Lu Su as the governor, Cheng Pu, Huang Gai and others as the generals, they headed towards the three counties of Lu'an, Chengde and Shouchun.

The three counties went from south to north, attacking Lu'an first.

When the boat reaches Wan County, the small boat can go northward by the river, but the number of people carried is not large.

The rest of the people can only walk, and it will take at least six or seven days to reach Lu'an.

Sun Jian's movements were fast enough, and Hefei was basically unable to rescue him.

However, a messenger has been sent to inform the plan. After reading the plan, Zhou Yu should know what to do.