A "fire raid" is a sudden and destructive attack by fire. Synonyms for this term could include "blaze assault," "flame onslaught," "ignition ambush," "scorching siege," or "inferno invasion." Each of these phrases conveys the intense and overwhelming nature of a fire-based attack. Other possible synonyms might include "combustion assault," "fiery blitz," "intense conflagration," or "scalding onslaught." Depending on the context and specific usage of the term, other synonyms could be appropriate as well. Regardless of the exact phrasing used, the overriding sense conveyed by these terms is one of danger, destruction, and urgent action.