At the beginning, the deaths were very high.
However, overall, the players only needed to adjust to the way the insects fought and then they'd be able to hold the battle lines very easily.
"These bugs are really weak. We'll also go on up."
The dispersed players watching on the side saw the bugs keep falling in front of the attacks of the three clubs, and the battle scene was filled with the joyous cries erupting from those who had picked up equipment. In the end, the players couldn't help it.
With the hole in the wall growing larger, the dispersed players chose to stay at the side of the opening to fight with the insects.
Ruling Sword implicitly consented to this behavior. It was like they didn't even feel like these people were here to take their monsters.