Hi, first post here =]
I just felt like sharing my current experience with DF mode.
So our seven brave dwarves found a volcano near some habitable glacier (I'm using the glacier world on Magma Wiki) which resulted in lots of hematite and native gold. Such riches enabled the fortress to grow quickly: dwarven traders and settlers, elven traders and even a goblin caravan came. The population hit 55 and we had a working iron industry (no steel because I had precious few trees and I needed beds), accomplished masons and a sealed area of the caverns to grow food.
Goblins started ambushing us, first in ones and twos (thieves and baby snatchers; only one snatcher ever got away, with a newborn baby girl =[). Then ambushing in tens. We got them with fairly few losses. My dwarves seem to worship and rever armor and hammers so much, they actually DIDN'T use them militarily (for some reason, they were all wrestlers and hammers and spears were left behind, even metal armor was left in favor of leather armors xD).
The cavern I conquered wasnt 100% sealed off: I expanded a bit to get a small lake for my hospital, and I then sealed it off except for a small, 8 square area on the edge of the map. I was planning to do something about that, when I found out one of my dwarven lumberjacks was stuck outside our obsidian wall. I de-constructed and he stormed in with a foul mood. I let him be and immediately started to replace the obsidian wall section...
Then it all went downhill.
Osman Fonutkulur Dungdaomli, a trifle pewter forgotten beast appeared. Oddly enough, it was already slightly injured and missing a foot. My first idea was to lead it off the still-unsealed wall and close myself in. But some rabbit pet was there, and lured the monster into my base. My army was comprised of 18 dwarves (pretty high considering I had 55 pop, 7-8 of which were children). My army of wrestlers in leather armor charged in, and was -obviously -slaughtered. The beast got 4-5 in the first rounds of combat, but my brave dwarves kept hitting it. By the time the beast was severely wounded all over (and covered in my dwarves' blood!) my militia was almost wiped out. I kept sending in recruits from the least-important areas (leatherworkers, bone carvers, some miners and engravers), but they were just dying or nearly dead in the caves.
Just when my pop dropped to 17-18, new migrants arrived, a standard-issue 22-dwarf expedition, which was immediately sent off to fight the beast. Elven traders got to my base but my depot is so far away from the caves, they might just have wondered why dwarves were so impolite to let them wait like that xD
Even the new conscripts got massacred, and a dwarven child lead the now-agonizing beast into the main area of the base. It followed the poor scared boy up lots of stair cases and into the forge and smelter area. My few still alive dwarves were either holding their guts in, tending to the throngs of wounded and corpses or trying in vain to reach the beast.
It must be noted that the captain of the guard and my best fighter was currently disabled after the last goblin skirmish: all fight long he tried and cancelled the "grab weapons" task while the base got butchered. He had a revelation, I guess: warhammers and breastplates are to be WORN, not left in stockpiles. Lucky for him, a woodworker who got with the last wave heard his plead, and actually grabbed a warhammer and a breastplate (I don't know why he got the items but the rest just charged in bare-fisted).
The hero, Bembul Togalalath, a mediocre wood crafter, went into the tunnel, where the enraged beast awaited. Smeared in blood, snarling and bloody, the thing charged but Bembul effectively used his hammer. His leg was broken during the fight, but the creature had no energy left, having killed maybe 40 dwarves. Bembul crushed its skull with the iron hammer and immediately set up to rebuild the fortress.
Right now, I've 15 pop, 5 of which are children. Bembul and one useless beekeeper are the only dwarves capable of actually moving. The rest are either at the hospital or somewhere dying. I thought this couldn't get worst, but right now, a goblin ambush just showed up. I'll see how it goes and report back =]