@Meo is correct. I made my response too complicated, probably because I was excited someone else finally reported a stinky ole locust purge.
Because I was on official you can be sure there weren’t any mods. My follower who was actually following me leveled up several times during my last purge. So it could be that you didn’t have any of your followers on “Follow.”
Ah OK now I understand. I have marked the solution that is correct then.
It was brutal and merciless.
During the first two-three waves I lost a great rhinoceros, a great lion, a saber-tooth and a bear due to the poison of the locusts. All of them were full of good food. It was not enough.
The only one to survive among the pets was my 9lv wolf because between two waves I took it and closed it in the stable with the horses.
I have solved the last waves with two thralls dancers transformed for the occasion into archers.
We won, but the base suffered serious damage in addition to the loss of pets.
It was a lot of fun!