Slightly after my fortress earned it's millionth unit of money it died. For the past few years more and more dwarves had been slowly dying to the coating of poison in the courtyard. The poison was brought by the forgotten beast Sarek Bisekshadmel. No one seemed to be willing to clean it up; yet they kept walking through it and getting foot rot, which quickly progressed to death.
The victims were brought to the hospital where they slowly died. Unfortunately it took me far too long to notice the poison on the beds and more were killed. Eventually I figure out how to make them clean the hospital, but by then it was to late.My number of dead dwarves had exceeded the current fortress population of 97. I couldn't build coffins fast enough to keep up with the number dying due to having only non-skilled masons. Because of all of this I was not prepared for a huge goblin siege.
I commanded someone to pull the lever to raise the drawbridge, no one good enough to break the siege was left alive. Unfortunately they were too slow. A squad of trolls had gotten into the fortress and slaughtered 53 dwarves before they were taken down by the random militia of wrestlers formed on the spot.
Brought down to 44 dwarves left my last skilled military dwarf went berserk. He was one of the only dwarves in full steel gear; a Legendary Axedwarf, Shield User, Armor User, Fighter, Dodger and Wrestler. Almost instantly 10 more fell. There was nothing I could do. On one side was the berserking Axe Lord, on the other the goblin siege.