If you recall your military history, the first explosive shells were known as bombs, and were fired from mortars. Hence the "bombs bursting in air" of the Star Spangled Banner. Mortars were usually large to very large bore, not terribly mobile weapons used by the artillery or the navy. Civil War photos will show you the naval mortars and the 13" railway mounted siege mortars used by the Yankees.
At least through WWI, with the introduction of infantry mortars for trench warfare, rounds for a mortar were known as "bombs". I think the Brits still use "bomb". In the US, I think the term round has been used at least since the later '30s, but as in the US the Infantry rather than the Artillery owns the mortars, I'm just not sure.
Thanks. I figured out years ago that if FReepers can't answer a question, then it doesn't have an answer.
Thanks. I figured out years ago that if FReepers can't answer a question, then it doesn't have an answer.