Yeah I believe if you go around the place there are terminals with notes talking about it all. I think there was some sort of betrayal within the Minutemen that caused the ambush
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Yeah I looked around the area some more and found a kid in a fridge who was a ghoul. Also a few of the gunners have legendary weapons with names having to do with the minutemen.
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There headquarters was Castle, however when it was taken over by Mirulurks and the leader was killed they stopped cooperating and it was kinda every minute men squad for themselves, they turned into raider groups.