After having gone almost three years since the last goblin siege, where the, supposedly, ruling demon emerged to lead them (didn't manage to kill him, only wound him before he limped off the map), HelpedInk was once more beset by evil.
Since I'd spent these three years by building additional defences, I thought I'd be safe. What I didn't know though, was that the dwarves had, for some reason, suspended the linking of the outer bridge (I really should start testing these things), which allowed the goblins to enter the central courtyard... Not critical, since they were still separated from entering the fortress proper by one additional bridge, but it did lead to one of my marksdwarf-squads loosing half it's number.
Drove the goblins off, started collecting goblinite, and everything went back to normal... or so I thought. It seems that a squad of trolls, apparently bothered by the constant rain of bolts from the walls, sought retreat in the tunnels which can be accessed from a stairway in the courtyard. What they didn't know though, is that these are the tunnels that are connecting my reservoir to the river.
That turned out to be... fatal.
*Pull floodgate lever*
Edit: Ugh, that sure backfired on me. Turns out that while you're busy watching stupid trolls drown, your reservoir overflows, and that excess water goes the only way possible, which is up through your wells... Result: A partially flooded dining room.
If you excuse me, I got some clean-up to do... *fetches mop and a bucket*