You may obtain this quest from either Preston Garvey, listening to Radio Freedom or by coming upon the Settlement on your own.
- Speak with the settlers at (random settlement location)
- Kill the raiders in (random settlement location)
- Report your success to settlers at the settlement
- Talk to Preston Garvey
- Various Settlements
Travel to the settlement and speak to the settlers. They will explain their troubles with Raider groups in the area. Agree and located the marked enemies and remove them. Return to the respective settlement and speak to the settlers there when the threat has been removed and then report to Preston Garvey. He will reward you with caps, and you have now acquired access to a new settlement.