Inferno’s main forces.

I think the chances are 50/50, but I still think the Orcs have the advantage because if there are mages and druids on the mines, you'll have to eliminate them anyway, as you can avoid losses if you're skilled. Personally, I stall for time if druids are stationed on the resource tiles. If everything goes well, they'll manage to cast one spell, which should be enough... or maybe even more. What kind of map is it? For example, like this one?