I know Abyssia has their Salamander Trainer who has animal awe and I've heard of him being used against elephants, but I never personally tried that myself.
Now you tell me! I pretty much assumed those guys were overpriced and mostly worthless, since they can only command a small number of magical beings, and they're neither magical themselves (like mages, who can also command magical beings) nor are they as good fighters as Abysia's normal commanders and/or assassins. I guess I didn't look closely enough at their other abilities. That said, the Salamanders themselves - who those guys are supposed to "train" - cost 60 gold each and have little (no?) protection, making them paper cannons. They're not useless, but in the early game they're a bit of a luxury for a nation that struggles to afford its rank-and-file troops to begin with.
So actually, I don't know that trying to recruit more salamander trainers would have made that much of a difference, in the end. Couldn't have hurt, but defeat was probably inevitable once Marverni deployed his elephants-overruning-province-defense strategy. Either way, you live and learn... Next time I'm Abysia-ing against elephants, a different tactic will be tried.