onslaught

(noun) a sudden and severe onset of trouble.

(noun) (military) an offensive against an enemy (using weapons). Synonyms: attack, onset, onrush. Example: "The attack began at dawn."

(noun) the rapid and continuous delivery of linguistic communication (spoken or written). Synonyms: barrage, bombardment, outpouring. Examples: "A barrage of questions." "A bombardment of mail complaining about his mistake."