To do this, he want you to build artillery placements in multiple settlements to fire upon the Prydwen from several directions, preventing the Brotherhood from defending against the attack. Once you are hostile with the Brotherhood of Steel and have finished The Nuclear Option for any faction (including the Brotherhood) he will inform you that it's time to bring the might of the Minutemen to bear against the Brotherhood of Steel. Yes, you do the same quest twice (it appears twice in the questlog) if you proceed with this quest. This is a long fight with tough opponents, make sure you are well prepared and the Castle is well defended before you trigger this fight. Note: Firing on the Prydwen later in this quest will trigger Minutemen Quest 07 - Defend The Castle, however the Institute forces will be replaced by Brotherhood of Steel troops arriving by vertibirds. This can also be started after completing the main questline for a faction. Triggered by becoming hostile with the Brotherhood of Steel after completing The Nuclear Option for any non-Institute faction.
MINUTEMEN QUEST 09 - With Our Powers Combined
