So, while having a discussion about how the BoS seen in Fallout 4 may actually be the Midwestern BoS from Fallout Tactics, some people have said that Fallout Tactics is not considered canon. However, i remember seeing Emil Pagliarulo say that parts of it are canon, and i also specifically remember seeing a tweet from Pete Hines stating that high level events of Fallout Tactics are indeed canon. Anyone able to find a link to that tweet? Tried googling it, but couldn't find it.
The Midwestern BoS is mentioned by Scribe Rothchild in Fallout 3, and Caesar in Fallout: New Vegas also mentions them. Caesar talks about how he's captured Brotherhood Scribes back east that didn't even know the name of the Brotherhood's founder, Roger Maxson. Plus, during the quest he gives you to destroy the Mojave BoS bunker, he seems to have a bit of experience with trying to take out Brotherhood bunkers, he talks about how much of a pain in the ass they are to eliminate, and how formidable/dangerous BoS Paladins are. Plus, you gotta wonder where his Centurion's got the T-45d pieces of their piecemeal armor.
Personally, i find the idea of Caesar's Legion being able to take on the Midwestern BoS a bit ridiculous. A bunch of guys in retrofitted sports gear wielding machetes and tossing spears being able to take on probably the largest Brotherhood chapter, with plenty of Paladins wearing Power Armor and using high end Energy Weapons? You'd think Caesar's Legion would get slaughtered by the superior firepower. Hell, that may be why Caesar's Legion is pushing West instead of East. Maybe his Legion blitzed a few of the most western Midwestern BoS bunkers in Colorado and took them by surprise, but the rest of the Midwestern BoS organized and mobilized, and Caesar couldn't even begin to hope to push further east then. Especially if it is indeed the Midwestern BoS in Fallout 4, and they got Vertibirds and a [censored] Zeppelin.