Quoting bpalczewski, reply 11Agree, i dont use fireball anymore either - actually it also leaves your mage useless, and you cannot adapt to what's going on/ cast another spell.
Fire darts is the way to go.
again... single target spells do nothing when you are fighting a war since you often get attacked by stacks of 4 5 archer
only fireball is viable or archers will wipe ur army (ofc you can have lots of archer yourself, that is equivalent ofc
Again...
I usually cast a wind-something spell that gives mass dodge protection against archers, then if u have 2 caster of fire darts it makes six spells before fireball even can be cast, and then usually it is all done
And if u have problems with archers i dont think the best idea is to wait 3 turns for them to shoot at you; in this 3 turns my melee troops are on them and more than half of them are dead due to fire darts. Not to mention that in this three turns you can mass curse them, wither or whatever you want to make them totally irrelevant.
Only time i found fireball any remotely useful is when facing a city with really lots of troops, and still, in average game i cast it like 3 times ...