Fighting by minutes is the kind of book that can change the way you think. When I first read it, it was a hammer between the eyes. I saw stars after reading it and spent a huge amount of time studying the implications.
The book's premise is simple. Warfare is all about time.This isn't a new premise, but Leonhard ties it closely to basic physics and expands on previous efforts to devise a basic calculus of warfare. Where Leonhard's previous book urged a move away from attrition oriented warfare and began to explore the basic ideas that are expanded on in this book, Fighting by Minutes perfects the ideas and makes it very clear how warfare should be prosecuted. The ideas of sequencing, fighting for additional time, trading space for time, and others have all been raised by other writers, but I find few places where they have been so eloquently brought together into a single book.
This work is much more dense than The Art of Maneuver and takes more work. However, the coherent analysis of warfare as being fundamentally time-focused is worth the extra effort. I spent months after reading this book trying to build a wargame that would accurately reflect Leonhard's ideas. I don't think anyone has ever come close to it (I failed too), but I'm sure that modern simulations don't ever quite do it.
The other issue with this work (it's incredible scarcity on bookshelves) has been solved by the digital age. Anyone with an e-reader can know acquire it.