|Brotherhood of Steel main Quest: Fire Support|
|Listen to Military frequency AF95.|
|Proceed to Cambridge Police Station.|
|Assist the soldiers.|
|Speak to Paladin Danse.|
|Reward: 300+ XP|
Brotherhood of Steel flag to craft in settlements
|Leads to: Call to Arms|
While traveling near Lexington and College Square (or just south of the Corvega assembly plant if heading southeast from Concord), the Sole Survivor's Pip-Boy will pick up a military radio broadcast. It details a cry for help from the Brotherhood of Steel stationed at the Cambridge Police Station.
Head towards the location and the player character will be faced with a horde of feral ghouls attacking the Brotherhood members stationed there. Assist the soldiers and when the fight ends speak to the commander, Paladin Danse.
If the Sole Survivor agrees to assist him, the Call to Arms quest will begin. Alternatively, they can persuade Danse to hire them as a mercenary, resulting in a higher sum of caps for the same quest.
If one has completed The Nuclear Option in favor of the Commonwealth Minutemen prior to approaching the police station, and remain on amicable terms with the Brotherhood, Danse will instead gift the Sole Survivor his laser rifle and send them on their way.
During this battle it is possible to accidently kill Haylen, Rhys, or Danse, causing the BOS to become hostile towards the player character. All three BOS members are flagged as essential during the battle, and will also ignore Friendly Fire. However, as soon as the last ghoul dies those flags are removed from the three BOS members. If the player character throws a grenade towards the end of the battle and the last ghoul dies before the grenade explodes, it is possible for the grenade to kill the BOS members, since their essential and FF flags will be cleared by the time the grenade explodes. Doing so will immediately set the BOS hostile towards the player character and lock them out of the BOS faction for the remainder of the game.[verified]
- PC Playstation 4 Xbox One Sometimes after defeating all the ghouls, the Brotherhood of Steel members refuse to talk, as if there are more ghouls incoming.[verified]
- On PC, this may be fixed using console command setstage bos100fight 1. If that doesn't work, setstage bos100 40 will advance the quest, but may cause other issues later on.
- PC Playstation 4 Xbox One After triggering the 'check fire' bug if one continues the main story quests to The Molecular Level, Virgil give an optional quest objective to talk to the Brotherhood and one will get a map marker to speak to Danse at which point one will have speech options. One needs to tell Danse they are there for help, then say no to his offer to join up, which kicks you out of dialogue, but gives the chance to talk to him again which then has the post 'Fire Support' fight dialogue options, accept there and 'Fire Support' should complete and leave one free to carry on with the Brotherhood storyline.[verified]
- PC Xbox One It is possible that when one arrives that Paladin Danse will become hostile, attacking the Sole Survivor and making it impossible to engage in conversation. One fix is to simply go to Cambridge Police Station after getting the Reveille quest (if one did indeed receive it). At this time it is unclear what causes the bug but skipping the trip to Boston International Airport altogether and going directly to Cambridge Police Station seems to fix it. Upon arriving at the station, Reveille will automatically complete itself and Danse will then speak to the player character as normal after the ghouls have all been dealt with, allowing the quest to be completed.[verified]