>>/49712/
That's just nomen-culture, if you look at more modern wars their are plenty of operations that involve 30 guys storming a compound or something, something on a tactical level. And Germans don't even call them operations but they don't call operational warfare operational warfare either, they call it something else but I forget.
Strategy comes form the Greek word Strategos meaning General, a Taxis was a unit of Greek Soldiers, about a Battalion. Tactics itself comes from a word to do with lines or arranging things or something like that.