Bombardment (7)
'bombardment' is the definition.
(synonyms)
This is all the clue.
(Other definitions for barrage that I've seen before include "Continuous fusillade or a torrent of questions" , "Onslaught" , "Assault" , "Artillery bombardment; flood barrier" , "Deterrent to low-flying air attacks" .)
'bombardment' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for salvo that I've seen before include "Firing of guns as a salute" , "Artillery salute" , "Fiery outburst" , "Rapid simultaneous discharge of firearms" , "Burst of rapid fire" .)