As expected, Robinson William's prediction became a reality.
By now, only the old, weak, sick, and disabled remained in the Magic Capital Base, aside from a small number of people who resisted the compulsory draft message. The Base had truly run out of any other resisting personnel.
The only consolation was that some air-raid shelters had been built in parts of the Magic Capital Base. Those civilians without much fighting capability, especially women, children, and the elderly, had timely hidden in the underground shelters when the Bat Monsters attacked and had promptly sealed the shelter doors.
The primary reason the Bat Monsters attacked the Magic Capital Base was that they were about to return home, and the return passage was located near the Base.
Just as they were about to return, a large number of Bat Monsters had gathered together, and with sufficient military strength at that moment, they decided to try attacking the Magic Capital Base.