Let me tell you the tale of InkPassages.
For in year 28, when the dwarves of the world were fresh, and territory yet unconquered, and riches gleaming from the sides of the mountains, did 7 dwarves embark on a relatively normal riverside hill. Next to the sides of the River Siegelurked, they dug into the soft clay loam. And as the loam parted, they revealed stone, and within this unremarkable mudstone was found ore in abundance, oceans of iron, caverns of gems, underground forests to fuel a booming tourist industry! But this was not meant to be. Even as migrants packed their last xXrope reed sockXx and began their arduous trek, legions of goblins-OK, 15- assembled, marching towards the swelling mountain home. They swooped from the south, an ambush, curse them! But their defective tower supplied copper armor and inferior halberds were no match for the strong iron axes of the 3 military dwarves, legends in their own right! And in this climatic first battle of Inkpassage, did Inkpassage emerge as a power in the Continents of Perishment, much more than a humble mining outpost! Ambush after ambush, siege after siege, troll, goblin and toad alike lay at it's feet! Unkillable beasts of lore pathed pathetically against it's sealed walls! And underground, new technology was perfected on stone tablets and designated, the animal AND gate, cornerstone of some frankly quite useless and odd project 'bout adding and computing or some other. Anyways, the dwarves dug, and they channeled, pumped and powered, and the gate+associated computer parts began to take shape! But this was not meant to be, for the fort had grown to 2 years, and a massive siege showed up. Wave after wave, seventy goblins in the finest iron, wielding the finest spears and maces, riding the largest and most viscous animals this side of fear, the Giant Toad. And they slaughtered the military, and clogged the traps with numbers alone! The order was given, the bridge pulled, but many civilians were lost in the struggle, and the strength of Inkpassage was broken. They endured for 3 years, to year 33, through starvation and tantrum and rampart totalitarianism. When the end seemed near, the police force (of one axedwarf) tantruming themselves, and almost none left untouched by the madness, were the project leader, a miner, several farmers and a random craftsdwarf walled into the farming/logic center of the fortress. But it was for naught. Water. Water was needed. No wood for barrels or beds meant that a suitable drinking spot was badly needed. The miner struck the floor over the central reservoir...
A massive torrent of water engulfed the room, flooding the farming quarters until the legendary mechanic, sole sane survivor of the wreckage was locked into the lever room. And he declared on his wounded, bleeding breath, that the fortress of Inkpassage was no more, and with those words passed into death, crumbling the fortress to it's bloodsoaked end.
But it is foreseen that the dwarves will reclaim, past marshes of bugs and spies and bring glory to the crumbled walls of Inkpassage, that the anarcho-communist goblin-dwarven treaty alliance that formed after the collapse of official government will be dissolved, that insane dictatorship and poverty and favoritism will return again, that useless projects will again be constructed, that goblins will once again break upon the waist-high walls of Inkpassage, and merchants will again be ignored.
tl;dr: 170 dwarf fortress, goblin attack killed lots of civvies, tantrum spiral, a misplaced channel in proto-survival fort flooded everything because of water pressure, everyone dead. Lots of facepalming involved.