Actually, I've also forgotten a bit about the first one, I'm afraid I might get confused. Most likely, you need to either adjust the animations (AnimSet) or the model (Model), or both.
If you adjust the Model, then you need to take not the ones that are presented for all these walls and gates in the editor by default, but from the Arenas->CombatArena->city name folder. Moreover, these models are incorrectly centered; their real and formal coordinates differ significantly (so don't be surprised when they "move" far beyond the edge of the map).
Or you just need to set the correct animations; that's also possible.
In general, you need to experiment here ;)