Nouns

(n)onslaughta sudden and severe onset of trouble
(n)attack, onslaught, onset, onrush(military) an offensive against an enemy (using weapons)“the attack began at dawn”
(n)barrage, bombardment, outpouring, onslaughtthe rapid and continuous delivery of linguistic communication (spoken or written)“a barrage of questions”, “a bombardment of mail complaining about his mistake”