Not a particularly useful read. Some of the 'key tactics' are quite vaguely defined, case studies are sometimes poorly related to the key ideas, and analysis of what makes the tactic work is usually quite thin. More interesting questions like 'What situations require this tactic? When is it most effective? How can it fail or be poorly implemented?' are all basically unanswered.
The book is at its best when it is summarising Clausewitz or Sun Tzu, so if this topic is of interest to you, I'd go straight to them and skip this book. The book may have merit if you're a complete beginner to military history or strategy.