Knight Brach was one of seven Brotherhood soldiers selected to be part of Recon Squad Gladius to investigate the Commonwealth. After helping fortify the Cambridge Police Station to be used as a base of operations, Brach took part in an assault on the Corvega assembly plant.
When Knight Worwick was mortally wounded, Paladin Danse called the retreat. While doing so, Brach stepped on a landmine, causing catastrophic injuries. While emergency triage was performed and stimpaks were administered, the injuries were too severe and he died within three minutes.
Brach is mentioned only in Fallout 4.