[Poopsi]

If you DO enslave his commanders, in theory they should rout. (for the record, enslaved commanders become soldiers. I do not know if GORing them wowuld restore casters to their paths...)

And if you keep enough chaff, in theory they should not be killed in the frontlines...

In general, I prefer to cast 5 specific spells and then set them to fire rear. Hopefully those five spells will make a difference.

Maybe it´s better to make them just stay behind troops and hope they´ll decide to cast an enslave mind from time to time, through...