My fort is built for turtling in. I quickly closed off my farming area in the first cavern layer, and now two forgotten beasts roam around outside those walls, taking occasional dips in the underground lakes. Outdoors, a huge square of cage traps every 4-5 tiles rings the 2x2 embark, and is my first line of defense. The second line is in my outdoor bunker - two doors lead to another series of cage traps, which will eventually be replaced with giant steel axe blades.
The humans decided to siege me recently, probably because their skink fiend (or some such) liaison was destroyed by the goblins that were sieging me at the time, although not before giving some of them fevers. Anyway, the humans just hung out in a corner, wearing all the grass down in a cute little circle. Then two squads of goblins also chose to siege me. Both squads were riding creatures - jabberers, cave crawlers, giant bats and other assorted beasties, while only the leader of the human squad rode a horse.
Meanwhile, my armorsmith and my arsenal dwarf were busy outfitting my 20-strong militia (in a population of ~95) with steel everything, while mechanics set up what will be a massive arena for disposing of caged goblins and simultaneously training military skills. Each Axedwarf (they ALL have axes - other melee weapons are inefficient, and crossbows are iffy) also has 3-4 war dogs at the ready.
Unfortunately, by the time I felt my dwarves were ready, the goblins had already retreated, even though they arrived after the humans. Quitters... I flung open the gates and sent both squads pell-mell towards the human squad. They made short work of the humans, and civilians were dispatched to start cleaning up, dragging the dozens of cages inside (the leader of one of the goblin squads managed to get both his jabberer and himself caught in different cages, with no other captures from his team) and chopping down more wood. Five of the militia dragged themselves to the hospital, where my doctors are trying to take care of them. One has already died of blood loss, and unfortunately he was my militia commander, so I had to do the squad-leader juggle to retain the rest of the squad.
That's where things stand right now. I'm pleased the military did as well as it did. I'm also pleased that my idlers have been fluctuating between 0-6 (six when my non-hauling miners run out of tasks) for several years, and that I have a fort spanning about 45 z-levels with no staircases at all (a large central spire runs the whole way, with a direction switch and some detours around cave layers, and room for traps and walls, should it come to that). Soon the military will be leveling higher by piling on some goblins released one at a time...