So, trying to keep this short, here's what's up.
Rolled a world and started a fort. I didn't know it at the time, but apparently the goblins where pretty much dominating.
9 years or so after I started the fort, Claspstroked, the mountain home fell. We became the new mountain home shortly thereafter.
23 years or so after I founded Claspstroked, I had mined all the candy and there was a lot of lag, so I decided to retire and start a new low population fort (Mirrored Shore) with two missions: First, to draw the goblins away from Claspstroked. Second, to raise a new generation of dwarves while minimizing losses.
I've been doing well on both counts. My champion alone has over a hundred kills with her axe and I've had quite a few children grow up in the fort, with more on the way.
I was looking at legends mode to see what's going on the world and saw that the goblins have recently abandoned our old mountain home. I decided to try out a little experiment, and this is where it gets pretty weird.
I did a save backup (in case of glitchyness), retired Mirrored Shore, and put together a military expedition to reclaim the mountainhome.
I brougth a full squad of soldiers and the stuff I needed to outfit them incase there where still goblins looking inside. After forging our arms and armor, we entered the site.
Most of the site was hidden until I got a soldier close to an area. Much like exploring caverns. At first, it seemed that nobody was there, then I got a notification:
An ambush! Drive them out!
Turns out, it was the Duke of Claspstroked. Just hanging out. He shows up in the creatures list as hostile, but didn't attack and my soldiers showed no inclination to attack him.
Continuing my exploration:
An ambush! Drive them out!
Oh. Hey. It's our king. Just hanging out. He's also hostile but ignoring us.
Anyways, I think it's fairly well known that reclaiming ruins can be glitchy, but I thought that maybe it would be a good idea to bring it up for those that don't know.