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If you are reclaiming a fortress there's a known bug that cause inhabitants to be marked as hostile without acting in any hostile manner, including detected ambushes.
The term "underground" isn't particularly specific: Do you mean inside your fortress, inside a reclaimed fortress, in a cave (i.e. a surface access feature), in a cavern, or something else?
A save made immediately upon the game pausing and reporting such an ambush might allow someone to investigate the issue, as just a mentioning of something doesn't provide any leads to pursue.
Saves can be uploaded to DFFD (http://dffd.bay12games.com/ [^]) in the Bugged Saves section (and a "save" consists of the RegionX folder containing the world you're playing). |
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