[Norfleet]

You should always plan for the elephants to rout: I tend to put them in the center, then deploy commanders and mages on the flanks. In a fight, most things that move tend to end up massing up in the center anyway: Elephants placed on the sides will thus curve into the center line, then rout and run over anyone you have in the center. If you put them in the center, they'll go straight forwards and bowl through enemies until they break, then exit through the center again, which has already been cleared for them.

Alternatively, you can cast Growing Fury on them. Then they'll go berserk and continue trampling and crushing more enemies!