How to deal with elephants

[sector24]

Honestly, the only way I've dealth with elephants successfully is to find the province that they're being produced in and use spells to reduce the population/resources to 0 or the put the unrest over 100. Once the elephants get on the field, the only thing that will stop them is an army much larger and more expensive.

[Gandalf Parker]

And again I am forced to wonder why there are unstoppable tactics.
Not wondering that there is one, but that there is more than one. Wouldnt that mean that one such tactic (for example, elephants) can be challenged by the other such tactic (dual-bless, Vanheim, etc)?