For those of you who are willing to entertain the idea that the vast majority of the military and history communities are not insane, and that there actually might be an operational level of war, I recommend this book:
http://www.history.army.mil/books/OpArt/index.htm
It is free to read online and traces operational warfare from its birth in the Napoleonic Era to 1991 and the Gulf War. The preface is two pages and describes the differences between strategy, operations, and tactics pretty well in a short space.
For the rest of you, well, you may find this an interesting work of fiction....
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