Goblins ambushed Bridgegate.
Given my dwarves tendency to rip things they don't like apart with their mouths, I didn't think they were equipped to deal with a goblin lasher and his four goblin axemen, so I ordered them inside and locked the door.
The goblins busied themselves chasing down my grazing animals while my dwarves huddled in the darkness, throwing parties at the statue of Inod, the deity of oaths, charity, and sacrifice.
Fearful that the goblins would never leave, and they deny me access to the forests needed to power my kilns, I had to come up with a scheme to deal with them. I ordered the five stones I had (I suffer from an aquifer) to be made in to mechanisms. I set up a long narrow tunnel ready to be opened to the surface. I put a war dog in a pasture as bait and five cage traps to capture the goblins, and repositioned some existing doors in case things go sour.
Time to breach the surface.
Everything goes smoothly, the miner runs back to safety and the goblins rush the new entrance. Then the war dog bolts from the pasture, past the cage traps, and charges a goblin axeman, who quickly cuts it down.
I haven't lock the backup doors yet, so the goblins continue on into the traps anyway. At least the first couple do, the remaining ones stop to laugh at their companions for getting caught. So, I ordered my 'military' into the passageway to get some kind of result. The remaining goblins acted predictably and charged the dwarves, straight into the cage trap. The fortress was saved.
But only four of the five cage traps were filled, where was the fifth goblin? After searching around, I found the corpse of a goblin axeman. Head caved in by the hooves of a water buffalo calf named Ongongstestrak. The young buffalo didn't survive the encounter, but he will be remembered.
In cleaning up the corpses, I notice that my refuse piles are over flowing with turtle shells. I order some projects to use some of them.
The four remaining goblins were disarmed and stashed in a corner while I went back to work trying to penetrate the aquifer. Some elves stopped by and offer me some replacement animals for my decimated herds and a cougar and grizzly bear for military training.
After emptying the cages of these new animals, my dwarves go about resetting the cage traps and storing the remaining cages, this brings my attention to the animal stockpiles where the goblins are kept. There are only three goblin cages!
Panicking, I look about for the escaped goblin, he is nowhere to be found, and none of my dwarves seem to think that anything is wrong. I look at the units screen, there are four goblins on the map.
I look at the animal stockpiles there are three goblin cages, each containing one goblin.
I make note of their names and go back to the unit screen. Single out the missing goblin and centre on him. The Craftdwarf's Workshop. What?
Some dwarf decided the goblin cage needed an image of Imageraces, the phantom spider silk headscarf in turtle shell, so took the cage, complete with goblin, to the workshop.