From Longman Dictionary of Contemporary Englishshellfireshell‧fire /ˈʃelfaɪə $ -faɪr/ noun [uncountable] an explosion caused by shells being fired from large guns a hospital badly damaged by shellfire
Examples from the Corpus
shellfire• Most of the Brigade casualties so far have been caused mainly by mortar and shellfire and, of course, the constant sniping.• He realized when he spoke to them under the continuing shellfire that he was ignorant of their lives.• As I entered the building I could see that it was damaged, probably by mortars, or shellfire. 