His Majesty the Emperor's personal presence made the members of the Ordnance Research Department extremely emotional.

In the test site outside Mirror City, the roaring sound of artillery fire continued, blasting away the cannon targets set up in the distance one by one, demonstrating a power and accuracy that satisfied Luo Ji.

Just now, the metal plate three hundred meters away had been blown away by a very precise artillery round.

At that moment, all the members of the Ordnance Research Department present cheered loudly uncontrollably.

This is a new breakthrough, which proves that the effective range of their Wanjie Civilization cannon has been officially extended to three hundred meters while ensuring power and hit rate!

During the shelling test, the four metal plates that were blown away were quickly sent to Luo Ji one after another.

Members of the Ordnance Research Department, headed by Ye Xuan, also gathered around, wanting to further confirm the power of the bombardment.

These metal plates, when seen from a distance, are not big in size. When they are brought to the eyes, they realize that each piece looks like a small wall.

Among them, the metal plate standing one hundred meters away had undoubtedly suffered the most damage.

The entire metal plate has been punched through! There are also obvious cracks scattered around.

The piece two hundred meters away was slightly penetrated.

The piece two hundred and fifty meters away was not penetrated, but the entire metal plate had been twisted and deformed.

The piece at the last 300 meters is obviously the most complete, but the surface has also been obviously deformed by the shells.

Taking a long breath, Luo Ji kicked the last metal plate with his foot, feeling the hard touch that came back. There was no doubt that Luo Ji was satisfied with the power of the cannon this time.

It can bombard and deform metal plates from three hundred meters away, and the destructive power it causes to the city wall is definitely considerable.

"How stable is this cannon? How much does it cost to produce?"

Facing Luo Ji's question, Zhao Lei, the deputy director of the Ordnance Research Department who was waiting nearby, quickly and respectfully handed over a document in his hand.

After flipping through two pages, Luo Ji frowned slightly.

The cost is indeed not cheap. Although it can produce stably, the production cycle is obviously longer than that of the three-bow bed crossbow and the return gun.

At the same time, the value of gunpowder and cannonballs as consumables is obviously completely higher than that of heavy crossbow arrows and stone bullets of return cannons...

To put it simply, in one word, expensive!

Put these three siege equipment as firepower output together for comparison.

The three-bow bed crossbow undoubtedly has an advantage in terms of range.

As for the returning artillery, it is less advantageous. In terms of range, it is already half as good.

At the same time, the attack trajectory of the returning cannon has an obvious large arc parabola. In other words, in terms of accuracy, it is not as good as the cannon, not to mention the power...

After careful consideration, Luo Ji called Ye Xuan over.

"How long will it take to increase the effective range of the cannon to more than 400 meters while ensuring power and accuracy?"

Faced with this question, Xuan Ye's two willow-leaf-like thin eyebrows suddenly frowned.

"Well, Your Majesty, I really can't say for sure."

Well, Luo Ji also knew that this kind of thing did not mean that he could strengthen it just because he wanted to.

Researchers need inspiration and need to find a breakthrough.

After this experiment, maybe Xuan Ye suddenly had an idea on her way back to the city and had another idea.

But it's also possible that a year and a half has passed and nothing has happened.

Luo Ji's mood now is also very complicated. He is not only afraid that Xuan Ye will have no inspiration, but also afraid that Xuan Ye will suddenly have an idea.

If he issues an order now to start mass production of cannons.

As a result, only two or three months later, a new model improved by Xuan Ye came out.

So should Luo Ji cry or laugh?

This feeling really makes my stomach hurt.

Luo Ji returned to the palace and leaned against the government hall. After hesitating for a while, he slapped his thigh and made up his mind.

"Send the order and ask the Ordnance Department to stop the production of return guns and three-bow crossbows. As for the cannons..."

At this point, Luo Ji's voice paused. He was obviously calculating numbers in his head.

How come his civilization of all realms has to be equipped with six cannons on its four borders, southeast, northwest and northwest? In addition, other cities in the border area, considering emergencies, must be equipped with at least four cannons, as well as other cannons.

City, it's best not to fall behind.

In addition, the cannons brought during the expedition must also be taken into account...

After his head hurt for a while, Luo Ji rubbed his eyebrows and slowly spoke...

"Wang Kai, go to the Ordnance Manufacturing Department in person and ask them to get the design drawings from the Research Department. They will start manufacturing the latest cannons today. As for the quantity, let them build a hundred cannons first. At the same time, let's start manufacturing the latest cannons.

Let Goblin Technology know and let them work on a cost-cutting version."

"I humbly accept my order!"

After Wang Kai responded, he walked quickly outside the palace.

Luo Ji undoubtedly valued this batch of cannons.

In order to wait for this batch of cannons, he deliberately stayed calm for a while.

After not seeing Luo Ji invade for several months, John Sal's mood was not much relaxed, but the pressure on him became even stronger than before.

He knew in his heart that Luo Ji had already figured out the intelligence on all the borders around him. The fact that the other party had not made any move must be preparing something.

This feeling is terrible for the party that was invaded.

As his thoughts whirled, John Thrall gritted his teeth and made a decision...

System prompt: Europa player ‘John ​​Thrall’ is invading your civilization!

Luo Ji raised his eyebrows when he heard the system prompt.

The next second, it became clear in my heart.

Is John Thrall here to check his bottom? In other words, he wants to see what kind of tricks he has been doing in the past few months.

Even if you can't figure it out, it's still good to add some confusion to Luo Ji and distract him.

In short, I just don’t want him to develop quietly.

But how could Luo Ji let him get his wish?

Just like when he invaded the dwarf civilization before, he mainly focused on collecting intelligence and basically did not do anything serious.

The threat to his border from a tentative battle like this is extremely limited and not something to be feared at all.

If John Thrall wants to fight, let him fight.

Luo Ji, who is located in the main city, can just continue his development.

Anyway, in this kind of battle, as the defender of the city, he would definitely not suffer.

As for whether John Thrall will suddenly attack with all his strength?

Impossible! This is a cautious person. Before Luo Ji understands what he wants to do, he will not risk losing troops and generals to attack the borders of civilizations in all realms!

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Chapter completed!