I have played thru all the endings with my 3 other PC's except with the Minutemen. So here I am at this quest and having a damn difficult time with this battle at lvl 30 on very hard. Somewhere along the way I must of hit one of my settlers in the mayhem. Once I finished defending the Castle against the Institute about 10 of my 20 settlers turn red and start attacking me. I had 2 options, start the quest over (I did this once) or show those ungrateful bastards who is boss. When it was all over countless Synths and all but 6 Settlers lay dead by the General and his Minutemen.

My question is, I assume the Castle will repopulate with Settlers? I now need some farmers and mechants to man my once 20 strong settlement at the Castle. If it will not repopulate I can always order other Settlers to move there.

I am not sure but you might of had a third option. Run. If you can clear the area maybe the next time you go back they will all be buddy buddy again. No idea if this would work just thinking out loud.

I thought about this but after my 2nd time thru the quest it just rubbed my the wrong way that they would turn on me b/c one of them stepped in front of me while I was shooting a Courser. That brings me to another thing, I wish there was a FLIR type scope in the game to counter the Courser's stealth boy usage.

I had Dogmeat turn aggressive to me at one point, and one out of 5 turrets at the settlement I was defending at the same time.

I repaired the turret and it turned green

Dogmeat kept yapping and snapping at me until I beat him unconscious and then when he recovered he was fine.....I figured it was some sort of bug as I wasn't shooting near either of them during the battle