So I was just preparing my fortress for the inevitable siege, but ended up being visited by a Fire-breathing, Flying Titan Slug. I had a slight idea what I was in for, but I definitely didn't expect to lose 81 Dwarves out of the 92 I had. I had prepared as many Dwarves as I could that had some fighting skill, gave them a moment to acquire weapons and armor and had the cannon fodder charge soon followed by my skilled veterans...luckily one cracked open his skull and his own fire burned out his brain.
Is there a way to fight these fire breathing flying titans? I expect losses, especially with the ability to cause a wildfire to spread through the map, but there has to be a way to avoid this somewhat.
Although, it was a lot fun being surprised like that.