Upon hearing Kusman's explanation, everyone understood now.
Indeed, things would develop in this way—if they only cleared one path to the second defense line, Blue Star Humans would definitely deploy all their military forces at the end of this path.
This way, they would be facing the stringent defense of all Blue Star People, and the difficulty of overcoming the second defense line would increase exponentially!
Moreover, this was completely different from their initial plan.
In their original plan, the second defense line was supposed to be easily breached.
After all, the second defense line was very long and much weaker in defensive capability than the first.
But according to the current method, clearing only one path would make the difficulty of breaching the second defense line epic, almost no simpler than the first.
Not only that, but the third, fourth, fifth... up to the ninth defense lines would be equally challenging, and the difficulty would increase tremendously!
