My fortress had only one entrance; a 3 tile wide hallway filled with thirty spiked wooden ball weapon traps in ten neat rows (the first row of weapon traps had only one spiked ball in each trap, the second two and so on, until the last row where they all had ten balls). After that, six cage traps and a war dog.
The entrance had two drawbridges each linked to a lever in a sculpture garden. No army yet.
Somedwarf is appointed to be mayor, and I've just struck plenty of native gold; let's make some furniture!
I haven't had anything worse than the odd goblin snatchter, but I'm getting kind of suspicious...
The first drawbridge is in the ice wall around my entrance. I decide I going to build a tower made out of ice on top, so my marksdwarves -that I still don't have yet- can shoot those nasty goblins. I need to have a stairwell down to my meeting hall so the dwarves can actually go up, bypassing the traps, and I construct a walled off area out of ice. One problem, the dwarf who made it is now locked inside and the stairwell isn't finished yet. Never mind; let's dig though the wall and build a door there.
It all seems to work. The ice tower gets another floor, and the fort now has 88 happy citizens.
But wait! What's this?
''A vile force of darkness has arrived!''
Pull lever. Entrance closed. Still no army. Forbid door. Wait a sec! The door has never been built!
Goblins neatly bypass all traps.
#FACEPALM THE FIRST#
Blood is everywhere. Quickly close off the nether regions on the fort with a forbidden door. Pfew!
22 dwarves left and falling. Hunting for vermin? No food stockpiles where the goblins can't slaughter you.
#FACEPALM THE SECOND#
They all starved.