Cannonballs flew to the top of the city, exploding, and fragments flew like snowflakes towards the defenders.

The defenders didn't expect the range of Great Xia's artillery to be so long, so they hurriedly dodged.

The guards shouted, "Puran! Plan! ”

When the soldiers at the head of the city heard the order, they all ran down the walls and hid behind the buildings. The defender also ran to the side, preparing to move his troops to attack.

Chen Mu saw that the other party was retreating, but did not order to stop the shelling, but let the heavy artillery continue to bombard. Because there are still enemy artillery on the head of the city, it is good to destroy a few of them.

After a while, the door of the Black Earth Fortress opened, and Chen Mu was about to let the light artillery fire, but he was stunned.

For it was not a steam locomotive, nor a war horse, nor a camel that rushed out of the city. Not even musketeers.

Just a bunch of "civilians" with hammers in their hands!

They didn't even have leather armor on their bodies, but they looked as if they were not afraid of death, or they were willing to die.

"! What kind of cult did the Westerners engage in? ”

Chen Muyi gritted his teeth, raised his arms and shouted: "Fire!" ”

Chen Mu gave an order, and the 100 light artillery pieces of the Great Xia Army were fired in unison, and the explosive bombs were like an iron curtain, enveloping the heads of those "civilians".

Even in the fierce artillery fire, Chen Mu could hear the miserable wail on the battlefield.

But who is to blame for this?

Civilians with weapons are no longer civilians, even if it is just an ordinary hammer, it can make Great Xia's artillery unable to fire, and can make Great Xia's military formation lose its attack power.

Even civilians are civilians of enemy countries, and their lives are far less important than those of soldiers in their own country. Chen Mu could only order the kill.

It was not Chen Mu's Great Xia army that killed them, but those despicable Westerners.

This move of the Westerners is to waste the shells of the Great Xia army.

After a while, the tens of thousands of "civilians" who rushed out of the city were almost dead, and the Great Xia army wasted several rounds of shells.

Chen Mu saw that the number of targets had decreased, so he ordered the light artillery to stop bombarding and let the musketeers deal with the remaining enemies

At this time, another group of people rushed out of the Black Earth Fortress.

This time, it's the regular army.

Musketeers.

They rounded the battlefield from both sides and headed straight for the heavy artillery of the Great Xia army.

"Hmph, you want to steal our artillery?"

"Put away the heavy artillery!"

"Light artillery attacks enemy cavalry!"

"Musketeers come forward!"

Chen Mu issued a series of orders, and Great Xia's war machine followed.

Both sides continued to open fire, and the battlefield was filled with smoke.

These musketeers, also Slavs. Great Xia had a good communication with them before, and I don't know what kind of bewitchment they received, and they actually took refuge in the Western People.

After Chen Mu and the other heavy artillery were put away, he ordered a slow retreat.

This was also part of the battle plan, so the Great Xia army did not change the chaos, but retreated in an orderly manner.

The casualties on the battlefield were still increasing, but the Great Xia army still had a solid advantage with a hundred light artillery.

After the battlefield had moved twenty miles, the Western Army finally stopped the pursuit. Perhaps because of the proximity to the mountains ahead, they were afraid of an ambush.

Chen Mu did not fight back, but continued to slowly retreat. The Great Xia army retreated another thirty miles before setting up camp on the road.

After the count, the Great Xia army lost about a thousand musketeers, and it is estimated that the enemy army is about the same. Fortunately, the Great Xia army fought on steam tracked vehicles, and neither the corpses nor equipment were left for the Western Army.

Chen Mu ordered the body to be buried in the mountains, and then repaired on the spot.

The next day, the Great Xia army began to return to the midway fortress.

Now the advantage of the Great Xia Army is not great, even if it defeats the Western Army and recaptures the Black Earth Fortress, it will not be able to hold it. I can only go back and make adjustments.

This black earth fortress was originally the bridgehead of Great Xia, but now it has become a thorn stuck in the throat of Great Xia.

Although it is said that it is possible to take a detour from the Rakshasa country, it is summer and the temperature is not low. But it's all undeveloped land, like a desert.

A detour would require more supplies, and it would not be cost-effective.

If you take a ship, the speed will be much faster, but the corresponding distance is also several times farther, and the gain still outweighs the loss.

The best way to do this is to increase the transport capacity again.

When Daxia finds oil, and then replace all the steam tracked vehicles with electric vehicles, the transportation capacity will be two or three times higher. The desert will be very narrow.

Anyway, the West Kingdom can't attack it now. As long as the kingdom of Isis is defended, there will be no oil to use in the western kingdom. Moreover, most of the kingdom of Isis is a desert, and even Great Xia cannot find the location of the oil fields, and it is impossible for the Western Kingdom to explore it while fighting.

In fact, except for Chen Mu, no one in this world knows that there is oil under this desert.

Chen Mu didn't plan to dig here, but put his hope on the Rakshasa Kingdom and the Northeast region.

All the way back to Great Xia, Chen Mu went to Huaguo again, asked for a sample of oil and crude oil, and asked people to send one copy to the Rakshasa Kingdom and the Northeast region, so that they could find the same thing.

Chen Mu didn't know what the characteristics of the land above the oil field were, so he could only let them dig casually.

After returning to the national capital, Chen Mu began to work on scientific research.

Now there is no oil, and the engine cannot be applied for the time being, but Chen Mu has now mastered the electromagnetic induction technology and has thought of a major invention.

Phone.

Corded telephone, to be exact.

Chen Mu dismantled an old-fashioned dial-up telephone when he was a child, and remembers the general structure. One of the most important components is the horn, which requires electromagnetic induction technology.

As for the other parts, it is much easier, and it can be made after a few more attempts.

On this day, Chen Mu called Long Xueyao to the College of Engineering, pointed to the telephone on the table and said, "This is the phone I said, which can talk over long distances." ”

Long Xueyao didn't understand yet, "How can this call?" ”

Chen Mu picked up the microphone and put it to his ear, "It's like this." ”

Long Xueyao also picked up the microphone in the same way as Chen Mu, and then Chen Mu shook the crank on the telephone, and Long Xueyao's phone rang over there, startling Long Xueyao.

"Oops! Hahaha...... It's funny, that's how the message is delivered? ”

Chen Mu smiled slightly, "It's not, you listen." ”

Long Xueyao looked at Chen Mu suspiciously, and the next moment she realized that Chen Mu's voice actually came from the microphone.

"How so?"

Long Xueyao looked at the microphone curiously, and then looked at Chen Mu.

Chen Mu explained: "This is the application of electromagnetic induction, the sound vibrates the diaphragm, the diaphragm drives the coil, and then the coil and the magnet generate electromagnetic induction and release electrical signals. ”

"The other end only needs to convert the electrical signal into sound to realize the call."