I just noticed in my current fort that 2 dwarves (that I know of) just showed up to my fort own their on (not part of a migrant wave).
(Relevant: I can control them and assign them jobs)
One of them was a Administrator that also had suspiciously high combating skill, that later I noticed that he was part of a squad from one of my previous fortresses.
The other one was a random farmer wich would seem normal had his job description not been "Infected" and he was missing half his body parts. I name dwarves that I know have been bitten by werebeasts as "Infected" as precaution for situations like these. Problem is I can't expel him, because he isn't with his family.
Now some context. I have been getting a quite constant stream of visitors from both my tavern and library, and a few days prior to me realizing this was a full moon, and with it came a human wererabbit.
I guess the macedwarf came along as a mercenary and just thought to himself "Might as well stay here" (there was no petition).
And I guess the were-something guy just showed up on the full moon and joined the fort.
Both of those were previously part of my civ.
Any ideas how did this might have happened ?
*EDIT* It seems that even though the "Infected" guy is covered in the blood of at least 4 different dwarves and also of werebisons he is, in fact, not a werebeast himself, as a full moon has just risen and nothing happened to him. However, how he arrieved is still a mystery to me.