Three Kingdoms: Cao Cao, please answer the question!

"If there is no reinforcements in the future, our attack on Hefei will be declared a failure!" Gan Ning said.

Then he asked again: "Where is General Dong Xi?"

Lu Meng replied, "He has died in battle!"

Everyone was silent, Dong Xi was considered a general of Jiangdong, and he died like this unexpectedly.

"Okay, the deceased is dead, and then we retreat to the edge of the answering space. If Jiangdong is confused in the message later, the lord has no time to care about him."

"Then we can only go back to Jiangdong!"

This was Zhou Yu's original idea. In fact, it doesn't matter whether there are 7 or 8 people, it is extremely difficult to capture the current Hefei.

Zhou Yu already had the idea of ​​asking for reinforcements before the answering field, but the answering field was delayed.

The Jiangdong Army retreated, while Cao Jun returned to Hefei City.

The number of casualties is more than [-], and the number of enemies wiped out is countless, but there is no doubt that this is a great victory.

Cao Cao showed his achievements and rewarded the army with wine and meat.

This time it looks like a big battle, but in fact it is far from starting.

"When the answer field disappears, Jiangdong's reinforcements may be waiting for us!" Cao Cao said.

The generals felt awe-inspiring. If they guessed with Guo Jia that Sun Jian had suppressed the chaos in Jiangdong at this time, what would Sun Jian do next?

Of course it is to send troops.

Not only to win Hefei, but also to consume the strength of the family.

Only these two points are enough.

So reinforcements are very likely, no, they will definitely come.

The so-called whether they can believe what they have or not, they are going to prepare for a big battle next.

And news came from Jiang Ji that the cement had been made, and the next thing was to need river sand.

Hefei has a well-developed water system, so it is not difficult to find river sand.

Moreover, preparations had already been made before, and Jiang Ji had already begun experimenting with concrete, but he didn't know if it was successful.

After all, he wasn't the one who got the reward, maybe there was something wrong with the formula he heard.

Cao Cao arrived and went to see the concrete that was made. It was still wet, but there was a footprint on it, which was very soft.

"Can such a thing be as hard as a rock?" Even Cao Cao was skeptical.

It takes at least one day to solidify, and the initial solidification will usually occur within three hours, but the weather is still cold now, and there is a lot of humidity in Yangzhou.

In addition, the concrete itself is not very standardized, so it may take more than two days to solidify.

"Just wait until it solidifies." Jiang Ji said a little nervously.

"Call me after it solidifies. Whether Hefei can withstand Jiangdong's attack is very important!"

Cao Cao already had the idea of ​​casting a concrete city wall in his heart. As long as the casting was successful, it would be useless for the Jiangdong Army to move any siege equipment.

Of course, this is by no means a day's work.

At this time, the last question appeared in the sky.

"This is!"

"how is this possible?"

"The Big Four..."

When the last question came out, it could be said that the world was shocked.

……

Chapter 175 Four Great Powers!

[Question [-]: Which are the four major powers in the world today? 】

【This question is multiple choice】

[a: Ancient Egyptian Empire, Babylonian Empire, Shendu Kingdom (Tianzhu), Han Dynasty]

[b: Roman Empire, Shendu Kingdom, Hun Empire, Han Dynasty]

[c: Roman Empire, Guishuang Empire, Parthia Empire, Han Dynasty]

[d: Sasanian Dynasty, Arab Empire, Carthage Empire, Han Dynasty]

[e: Roman Empire, Sasanian Dynasty, Shendu Kingdom, Han Dynasty]

The four major powers in the world today!

Not to mention shocking.

Because the people of the Han Dynasty thought that they should be the only powerful country in the world!

But in fact it is not so.

There are three other powerful countries that are comparable to themselves.

"I've heard of Shendu Country, but isn't that a small country in the southwest?" Liu Xie asked with some doubts.

"Shendu country is not small even if it is said to be small, and there are millions of people." The eunuch replied.

Liu Xie was surprised: "There are a million people?"

Although he cared about the world, what he cared about was the world of the Han Dynasty, and he didn't understand the affairs of foreign countries.

In his eyes, foreign countries should be small countries with no more than tens of thousands of people.

The eunuch is a book reader, and knows a lot about these things.

The eunuch said again: "There are hundreds of countries in the Western Regions, and the small ones only have a thousand people. Back then, the Protectorate of the Western Regions governed more than fifty countries, and there were hundreds of thousands of people."

"And the Guishuang Empire is a big country in the Western Regions, and there are actually records. Have you heard of the Great Xia Kingdom, Your Majesty?"

Liu Xie nodded, "Of course! Didn't Zhang Qian reach the Great Xia Kingdom back then?"

"That's right. At that time, the Xiongnu were fierce and endangered the border of our Han Dynasty. As a last resort, Emperor Wu sent Zhang Qian to join forces with the Yuezhi to attack the Xiongnu."