Had a Wereape show up to my completely defenseless fort in my third year. I start panicking, thinking I'm going to have an absolute disaster on my hands with multiple dead/infected dwarves and causing a massive stress problem (although I will say that my dwarves are
way happier in 47.03 than in any fort I did in v44). Before it could do much though, a human crossbowman visitor who was on their way out ran into it, and held it off long enough that the only other casualty was a random guineahen. Sadly, the crossbowman died in the struggle, but soon after his valiant death the Wereape transformed back into a dwarf, and proceeded to be pummeled to death by ~5 random citizens (and a shockingly vicious peahen). Wanted to give him a proper burial, but sadly he wasn't a citizen so his corpse is just sitting in the corpse stockpile

Also had a minor incident where a completely peaceful Troll walked up from the caverns into my fort without me noticing. Nobody was harmed aside from mild bruising/scratches/etc., and the troll was (slowly) put down from many civilians walking near where it showed up. Besides the dwarves however, there was also a cat that joined in the fighting who shook the Troll around by it's head
28 times. Something tells me I should be afraid of the animals living in my fort.