On Chen Xin's way to Europe, he once looked down from a guard ship in the sky at the Eastern European defense line under construction.
That construction site, stretching from one end of the horizon to the other like a giant dragon lying across the land, left a very deep impression on him.
However, although that line under construction was grand in scale, it was still far less impressive compared to the European Defense Line, which was already in use and engaged in fierce battles almost every moment.
At this time, the Guardian Land Ship carrying Chen Xin had already reached the forefront of the European Defense Line, and below them was the most intense frontline battlefield.
Here, even in the air, there was a certain degree of danger.
This was because the alien aerial units would occasionally launch air raids, attempting to break through the line's defenses from the air. Encountering these flying units in the air would undoubtedly pose a certain threat to the Guardian Land Ship.
