The goblin civ that sieges me uses giant cave swallows as their mounts, which makes them devilishly tricky to pin down. The melee goblins scatter and run when I send out my dwarves, and the goblin archers loiter just outside of range of my towers. I don't want to send my military at a bunch of archers, though they'd probably make it through alright as they're all kitted out in steel and bronze.
As soon as the siege ends, I'm adding another half dozen towers.
The latest siege had trolls, which is fairly common, but apparently trolls have professions now and a troll miner actually showed up with a pick. They also all had clothes, some of which were made from troll leather.
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After five years in this fort, I only have three permanently disabled dwarves taking up hospital spots, so that's not so bad. It'd be nice if crutches worked and they could hobble about on their floppy, nerveless legs.
I notice dwarves get bandages and sutures for organ damage. I'm not sure you're supposed to put bandages on a lung, or sutures in a liver. Pig tail thread must be finer than I'd thought.
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When I first breached the caverns, my hunter ran out and tried to kill a GCS. The spider used him as a chew toy until my militia took it down, but biting appears to have been nerfed enough that he survived and got badass scars over most of his body.
EDIT: I got sick of the goblins, so I decided that 4 years was long enough to have a forgotten beast squatting in my cave and my military kicked its ass with aplomb despite its 'deadly spittle' and the fact it waited for an age to come up out of the water and fight. This one only dropped 199 meat when butchered, which is disappointing compared to the pterosaur from my last fort which dropped 300+.