Definition of fire brigades:
(n) :
(firefighting, UK, Ireland) An organization, often part of a local government, whose purpose is preventing and putting out fires.
(n) :
(firefighting, US) A group of people within a corporation or industrial site, organized for the purpose of extinguishing fires, usually in addition to their normal job.
(n) :
(military, US) A trained unit that can be rapidly deployed to deal with any difficult situation.