This is an OPTIONAL quest and occurs after The Nuclear Option (Minutemen). Afterwards become hostile with the Brotherhood of Steel. One way is to kill a leader of the Brotherhood (Now is your chance to get Elder Maxson's Battlecoat). Then talk to Preston and he'll give you this quest.
End of Defend the Castle (Brotherhood) @ 13:42
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Fallout 4 Minutemen Quests - [ Ссылка ]
