The trap was set.
The most challenging part wasn't creating the trap but getting the prey to step into it.
After the previous ambush, Yan Xia had reason to believe that the Spider Civilization would be on high alert for asteroids in deep space.
However, the size of the asteroids this time had been condensed to an extreme. Even asteroids of tens of meters in size, or an asteroid cluster, would usually be navigated through directly by battleships.
Considering the strength of the battleship's outer shell, even if it were an asteroid of several hundred meters in size, a high-speed collision might not necessarily leave a dent on its surface.
To lure the Spider Civilization into the trap, Yan Xia decided to sacrifice those spaceships.
There were still many spaceships left from the last war, but the energy reserves were running low.
The Federation had established the classification of starships, spaceships, and battleships to limit the size of ships its citizens could use. If a ship was too large, it would have a larger energy capacity and, consequently, more powerful weapons, which could pose a challenge to the Federation's internal security.
Over the past few decades, energy reserves had been replenished, and some of the damaged ships from the previous battle were retired. These ships would once again form a larger encirclement to counterbalance the Spider Civilization's battleships.
That was the plan.
And that's exactly what was done.
"The Spider Civilization's fleet has a total of 420,000 battleships entering the encirclement."
Yan Xia received the information.
After the last encounter, the Spider Civilization had learned its lesson and was no longer staying in a tight formation.
At this moment, they were still grouped, but the formation was divided into three parts, forming a triangle as they advanced.
With the additional 610,000 battleships that joined after the last war, the Spider Civilization still had 1.19 million battleships at the forefront. However, they no longer posed a significant threat to the Federation's surroundings.
To win, the Spider Civilization had to attack Sirius.
The initial capital star system of the Canopus Star Domain was Canopus, but since Canopus was not a large star, Yan Xia had moved the capital to Sirius, a blue giant, after returning from the Olive Branch Civilization and resolving the risk of their super-gravitational weapons.
"420,000 ships, that's quite a number."
"To destroy so many ships, the three fleets should launch a collective attack."
At this point, Yan Xia's decisions were no longer crucial.
The spaceships lacked tachyon communication devices, so Yan Xia couldn't make decisions, and Ella couldn't control them remotely due to the vast distance in space.
All decisions had been programmed into the ships' computers thirty years ago, and these ships could be understood as programmed drones.
...
Six months after Yan Xia's statement, one of the Spider Civilization's fleets was besieged by spaceships and lost over a thousand battleships.
The Spider Civilization thought the Federation was attempting the same tactic as before, so they quickly mobilized other battleships to break the encirclement from the outside.
As expected, the encirclement was broken in the third year, and the spaceships began to scatter in all directions.
With too many ships scattering in countless directions, even the Spider Civilization had difficulty deciding which direction to attack first.
But at this moment, a group of tightly packed spaceships entered the Spider Civilization's field of view. The density of ships in this direction was obviously high, with over a hundred billion ships in one area.
Although a hundred billion ships were not many compared to the total number of ships, the fact that they were grouped together suggested that these ships might be important, perhaps command ships.
To avoid the trap, the Spider Civilization's fleet did not merge but sent only one fleet to pursue.
The spaceships were naturally fast, and the Spider Civilization's battleships couldn't close the distance in a short time.
As expected, the Federation's spaceships turned towards an asteroid belt during their retreat, where the asteroids were very small. The spaceships crashed through them, appearing harmless.
If a 10,000-meter-wide asteroid belt could be passed through, then the Spider Civilization's battleships could do the same.
However, having learned from the previous lesson, the Spider Civilization's battleships also used numerous detection devices to scan the asteroid belt. They sent 1,000 battleships as the vanguard to pass through the asteroid belt first.
No problem!
Or rather, they themselves thought they were being overly cautious.
After that, all the battleships advanced at full speed.
The asteroid belt was too long, and it was impossible for them to go around it, as they would never catch up. At this point, they had only two choices: to pass through or retreat.
However, Yan Xia had gathered many psychologists from the Federation, and the placement of this asteroid belt was carefully planned.
Firstly, the distance from the original encirclement couldn't be too far, to prevent the Spider Civilization from giving up the pursuit.
At this point, the Spider Civilization had only been chasing for a few days, and they wouldn't give up.
The fleet entered!
As a large number of battleships entered, the black hole devices inside the asteroid belt were activated.
These black holes were too small, and there weren't enough of them. Even if the Spider Civilization's fleet rolled over them, it wouldn't cause much trouble.
Therefore, the primary function of these black hole devices was to generate small-scale, high-frequency gravitational waves to create more black holes through their collisions.
The collision of gravitational waves was like the collision of water ripples, which, when too turbulent, could form whirlpools. Similarly, the collision of gravitational waves had a chance of forming black holes.
Yan Xia had used a similar tactic against the Purple Thorn Civilization.
However, the intensity of the gravitational waves this time was far beyond what was used before.
The black holes formed by the collision of gravitational waves were now visible on a macroscopic scale.
Tens of billions of short-lived black holes, with diameters of several meters to tens of meters, were generated, instantly swallowing the entire asteroid belt and 390,000 of the Spider Civilization's battleships.
Was it possible to avoid this?
Absolutely not.
Black holes were an unsolvable problem for a Level 2 civilization, or even a Level 2.5 civilization.
Even the Olive Branch Civilization would be mercilessly torn apart by these black holes.
There weren't many space combat tactics, and the simpler, the better. However, sometimes, leveraging some tactics could achieve remarkable results, especially in situations like this.
After absorbing the matter and energy from the battleships, the black holes emitted a large amount of gamma rays.
This star domain instantly became a forbidden zone.
The Spider Civilization's fleet observed this situation.
With the siege and this trap, over 400,000 battleships were destroyed, resulting in an instant loss of one-third of their fleet.
The Spider Civilization went from being proactive to reactive.
If they continued to advance, they didn't know if they would face another trap from the Federation. Even if they avoided it, they would no longer have an absolute advantage in a head-on confrontation with the Federation.
This blow was too severe.
They had clearly been very cautious, but they still fell into a trap.
After weighing their options for several months, the Spider Civilization chose to retreat, planning to organize another offensive later.
But what they didn't know was that this departure meant they would never return.
The information from their rear was already on its way.