A tiny 20x20 ft fence holding 20 beastmen is not a beastman stronghold. They are more like the house of the 3 little pigs. It's not like they look like they are guarding it too. They are more just like in a cage.

Castle Oztroja was a beastman stronghold.
Davoi was a beastman stronghold.
Castle Zvahl was a beastman stronghold.
Whats the quadav place I forgot?

They are entire zones with nothing but beastman tribe in it. Putting 20 beastmen in a tiny little spot and calling it a stronghold is just lazy. You can pretty much kill all of them at one with arrow helix.