Dealing with Hydras

[HoneyBadger]

Nation basically aside, the first thing that comes to my mind is curse-spamming the hydras themselves, and then mass producing Bow of Botulf, and sending in cheapo flyers equipped with medallion of vengeance. Attack the rear ranks enough, and the whole army might retreat.

Remember too, each hydra is a 250 gold, non-sacred, gold suck, so hit them in the pocketbook by instilling unrest.