I didn't die, but hundreds fell unnecessarily...
Halflings are amazingly powerful in this game due to their food/growth bonus, "lucky" trait, and unique "slingers" unit. Fortunately the AI wizards don't realize this, and waste their halfling towns on lackluster buildings.
But then I banished Tlaloc while he had a decently built-up halfling city on my border, in a choke point of sorts. The town reverted to neutral, and I focused my attention elsewhere. Until I noticed halfling raiders trying to loot my border towns. Bands of fat greedy slingers were only driven back by combat summoning, and my only slingers sitting behind city walls.
I send my uberpowered heroes over to the city and promptly NOPE out of there - it's chock-full of slingers, and defenders shoot first. If I had the Missile Immunity spell they *probably* could have survived, but I know from experience that massed slingers can crit *skeletons* to death.
So instead I sent a max-size stack of my own slingers, mostly veterans. Despite being evenly matched armies, they slaughtered half of mine in the first round. And thanks to the walls, my survivors didn't manage to finish off a single unit.
Mainly out of spite I continued to send massed stacks of slingers (instead of something smart like tower-shield swordsmen) with progressively greater buffs. I sacrificed over 30 units of halflings before managing to storm the gate with Heroic, Giant Strength slingers with Stone *and* Iron for flesh, flaming eldritch daggers, and backed with flame elementals.
(Flame elementals are "immune" to mundane weapons, which is a laugh and a half. "Immunity" in this case just means somewhat resistant, they were nothing more than summoned chaff to distract the enemy)
Master of Magic
The game provides *so* many ways to deal with this, but I enjoyed brute forcing it