Answer: cannonade

AnswerCrossword Clue
CANNONADEBattle barrage
CANNONADEBarrage
CANNONADENoisy bombardment
CANNONADEDerby winner: 1974
CANNONADEWinner of 100th Kentucky Derby
CANNONADEAttack with Big Bertha
cannonadean attack with heavy artillery / to attack with heavy artillery
cannonadeA period of continuous, heavy gunfire