This still remains the most epic fight I've ever had the fortune of playing:
Wildnesspaged was built in "joyous wilds", a place that had swarms of pixies, fairies and fluffy wamblers. It was an elf's greatest fantasy. By the time we were through with it, the region was a blasted wasteland that was long past being even an echo of its former self.
This was due in part by the efforts of the dwarfs themselves, and also the ancient evils they awoke in their lust for precious minerals. The fortress itself was fairly standard: a tower surrounded by a chasm, accessible only via a retractable bridge. But there were also a few non-standard features, such as chimneys built above refuse piles that purposely spewed miasma out onto the surface. Everything was clear-cut, and unicorns were hunted with weapons made from their very bones.
I will always remember the doomed elven caravan that arrived from downriver, pulling their wares past abandoned unicorn carcasses that bristled with unicorn-bone bolts. They unloaded their goods just as goblins attacked, and all of the traders save for one were shot and killed.
But the most epic was when five forgotten beasts managed to breach the surface. You see, I had built a separate downward shaft to breach the lower caverns while keeping the bulk of my dwarfs safe. While this shaft was trapped to high heaven, it wasn't enough to stop the beasts from seeing the light of day once more.
Three of the beasts were taken care of with relative ease, but two of them posed a bit more of a challenge: one was a blob made of fire, the other a giant winged serpent.
Now, as soon as the blob of fire emerged, fire spread across the land in its wake. Whatever we dwarfs hadn't already desecrated, it burned to ash. The two beasts lunged towards the fortress and, mercifully, we managed to injure the serpent's wings so that it couldn't fly over the protective chasm.
Most of the dwarfs made it inside, except for one: a recruit marksdwarf. She was a young thing, but skilled. From a hill next to the fortress, she sniped the beasts, striking the blob of fire in its heart so that it exploded next to the serpent. The serpent had all of its skin melt off, and then it went after the recruit.
The two of them fought amongst the flames that now engulfed the entire map while dwarfs from the ramparts fired down at the beast. They mortally wounded each other, and it wasn't until it snowed ash that we were able to retrieve her corpse, but she had single-handedly stopped two forgotten beasts with nothing but a crossbow while the world burned.