Seeing the various finished products that the Yunkai people had refined using the Duojia ore, Ruo Manni guessed that the Yunkai people might have encountered an energy crisis.

In the several interstellar wars that the Yunkai people had fought with the Gurame Star Domain Alliance over the past six months, they had not gained any advantage and had not been able to occupy any planet with life, so they certainly had not received any supplies.

Since the interstellar migration, the Yunkai people have been in a state of only consumption and no replenishment. Especially in the several wars with the Gulame star field, the energy consumption of the Yunkai people is estimated to be very large, so large that the Yunkai people may not be able to bear it.

Therefore, the remaining energy of the Yunkai people is probably not enough to support their all-out attack on humans.

Therefore, the people of Yunkai Star secretly occupied the life planets of the Bredoya Empire. It was definitely not only because these two planets were easy to take over, but more likely because these two life planets had the energy they needed.

"No wonder the Yunkai people changed their previous arrogant and forceful attitude of attacking us and occupied two planets silently. It turns out that they did it to replenish energy." Dean Aitchison said to Ruomanni in a private chat.

There was also such a factory in the hexagonal castle that Dean Acheson and his team conquered. After the two of them talked about it, he also thought of this possibility.

"The Yunkai people must be running low on energy. Everyone, take away everything that can be taken away from the factory, leaving nothing behind, and then destroy the entire factory." Ruo Manni ordered her men.

In the past, Ruo Manni always had a question in her mind: why didn’t the Yunkai people send out many warships in the battle on Topaz Star? Even if they destroyed thousands of Yunkai warships, the Yunkai people must still have a lot of warships.

And why did the Yunkai people evacuate in a hurry when they were about to be defeated?

It turned out to be due to lack of energy.

If this is true, it is really good news for humans. As long as humans can hold on and not allow the Yunkai people to occupy any life planets in the Gulame star field, the Yunkai people's combat effectiveness will only become weaker and weaker without energy replenishment.

"Yes." Ruo Manni gave the order, and Yuchi Kazra and Sheila Shahin immediately took the order and led their men into action.

Although their method of attacking the Hexagonal City and going straight in to kill the enemy and confiscate the factory resources was very efficient and there was not a single casualty on the human mecha combat division's side, Romannie and Dean Atchison still felt a pang of pain in their hearts.

Dean Atchison took a break from his busy schedule and muttered to Ruo Manni in a private chat: "Cousin Xiyahai is so cunning, calculating our crystal core. We used the crystal core at our own expense, and we don't know if our cousin will compensate us in the future."

"Given the character of cousin Xiahai, if you give him the evidence, he will definitely compensate you. But don't expect any compensation like crystal cores. You'd better think of other conditions." Ruo Manni said incisively.

If the empire was not short of energy, would Prince Xiahai Adam have plotted against them like this? So other things are easy to deal with, but don't even think about energy.

The two were just talking like that. With the number of crystal cores they had, it was not that they couldn't afford to use them up. They were just being miserly. In the interstellar age, there were not so many mutant beasts for them to kill.

Both teams used the same method to conquer the hexagonal cities, killing and killing smoothly. However, this method obviously affected the Yunkai people. When Ruo Manni broke through the defense of the fifth hexagonal city, she received an alert from the spy robot that a large group of Yunkai people were flying in their direction and would arrive in about ten minutes.

"The Yunkai people have counterattacked us. Everyone, please act according to the second plan immediately." Ruo Manni ordered on the public channel.

"Yes" a unanimous voice sounded in the public channel.

The Yunkai people gathered most of the troops on Doga to encircle and suppress them. Although Romannie and Dean Atchison's teams killed a lot of Yunkai people, the number of Yunkai people was still many times that of Romannie and her team.

Originally, the total combat power of humans is not as good as that of the Yunkai people, and the number of mecha combat divisions is much less than that of the Yunkai people. If they are surrounded by the aggressive Yunkai people, no matter how high the cultivation level of Manny and Dean Acheson is, they will not be able to protect their men.

However, Romannie and Dean Aitchison were well prepared for this. As soon as they discovered that the Yunkai people were concentrating their forces to encircle and suppress them, Romannie and Dean Aitchison led their men to retreat into the forest.

After all, this is human territory. Although the environment here is suitable for the Yunkai people to survive, there are definitely some areas where they are not adapted to. The forest is the Yunkai people's shortcoming.

Ruo Manni and Dean Atchison were confident that although they had a small number of people, they were all level 7 mecha combat divisions with experience in fighting against the Yunkai people. After luring the Yunkai people into the forest, they started a circuitous guerrilla war with them, and the Yunkai people really suffered a great loss.

The smallest mode of the Yunkai people's mecha is almost twice the size of human mechas. Therefore, in the forest, even if their mecha equipment is more advanced than human mechas, the obstruction of the trees interferes with the Yunkai people, making it easier for human mecha pilots to attack.

However, although the human mecha combat division had an advantage in the forest, the number of Yunkai people was larger, so the winner could not be determined for a while.

However, as the Yunkai people suffered more and more losses, the human alliance army gained an increasingly greater advantage. In the end, the Yunkai people could no longer hold on and wanted to escape, but they were surrounded by the human alliance army who had been on guard for a long time.

This battle lasted for a whole day and night, and the two teams of Manni and Dean Atchison killed more than 5,000 Yunkai people in total.

Ruo Manni and Dean Atchison decided to press on and eliminate all the Yunkai people on Doga Star. Unexpectedly, the remaining Yunkai people acted very quickly. They quickly left Doga Star in their mechas, boarded the warships outside Doga Star, and fled to the outer space of the Bredoya Empire.

Ruo Manni and her team finally took back the planet Doga which was occupied by the Yunkai people, but they had no time to rest because most of the hexagonal castles had not been conquered yet.

The cost of using plasma cannons is too high, and the consequence is the destruction of the hexagonal castle. If Manni thinks that these hexagonal castles can be used by humans, it can greatly save the cost of planet construction.

After destroying the Yunkai people's shielding device, Doga Star was finally able to contact the outside world. Ruo Manni immediately connected to the video of the top military experts from the Imperial Capital Star of the Gus Empire.

A few days ago, when Ruo Manni went to the Imperial Capital Star to "deliver goods" to these old experts, she was very thoughtful and asked them for their contact number so that she could contact them directly.

Sure enough, it comes in handy now.

When Ruo Manni explained her request to these old experts, when they heard that they were asked to find a way to break the defense system of the hexagonal castles, the five of them crowded in front of the video with shining eyes.

"Show us a holographic video, and test these data." The five old experts excitedly instructed Ruo Manni.