"You've taken all the life out of war--you know that, don't you?"
"It's the way I like it," said Cletus.
This quote sums up Tactics of Mistake very well. A milSF story that means well in terms of sci-fi tactics and strategy, it plays out in such a clinical and emotionless manner that it takes all the fun out of every aspect of its premise.
The focus of this book is the military career of Cletus Grahame. Yes, "Cletus". Perhaps that name wasn't as ridiculous in 1970 as it sounds today, but considering that the book's back cover changes the name to "Donal Graeme", then perhaps the publisher also felt that that name was rather silly, at least for what is supposed to be a military genius. Anyway, Cletus Grahame is indeed a military genius capable of defeating any army of any size in the universe with just his intellect. And he certainly manages that, but for what I feel are the wrong reasons that may even border on Mary Sue territory.
For starters, Cletus is never, ever wrong. Not even once. Whatever he says will happen, happens. If he says his enemy will act a certain way, they absolutely will, on the dot. It's easy for someone to win anything if they are 100% right about what their opponents will do, regardless of how doubtful and risky it may be for them to do what he predicts.
So the military operations Cletus undertakes with his oft-scarce army of soldiers are less about outsmarting the enemy and more about... well, not doing much of anything. The "tactics of mistake" that Cletus introduces early on are about taunting the enemy into feints so many times that they get overconfident and then when they lower their guard you strike at full force. Think of the boy who cried wolf. The problem is that this is seldom what happens in the handful of military operations that occur in the book. What actually happens is rather more dumb. To wit:
1. Cletus predicts beforehand every single military move that the enemy is gonna make (of several that they have the option to perform, mind you), no matter how detrimental it is to their own benefit.
2. Cletus moves himself and/or his troops in such a way that they are ready to ambush their enemy exactly where he knows they will be, because of course they will.
3. Practically nobody shoots or dies or anything because the ambush is always so flawless that the enemy surrenders immediately.
This is the general flow of the "military tactics" that happen in every "action" scene. Cletus always attains victory not through clever tactical maneuvering but by letting the enemy be dumb and ridiculously predictable, because he says that they are.
It's more about the enemy being brainless, than Cletus being smart.
And this seems to be fine at first, since the first (and probably best) military operation has him smartly maneuvering battle lines and reacting to terrain conditions that change the enemy behavior and thus his own army's movements. BUT. This is only on the surface. Everything that happens here was described by Cletus before the battle even started, so it's not really a battle of wits and strategy, but simply an execution of what Cletus said he was going to do in the first place. The enemy is too dumb to react to anything or have even a chance to counterattack or even harm Cletus's forces in any way.
This is BORING action.
And while I appreciate that it's proper military, tactical action (which I always crave), it's just too low stakes to be interesting. No twists, no tactical outmaneuvering. Just Cletus kicking everyone's ass because he said he would.
(The worst part is that the actual way he wins is by himself using a ridiculously efficient hoverbike that is practically noiseless and packed with dozens and dozens of mines that he deploys while watching ALL the enemy troop movements without a hitch. If this bike is so wonderfully powerful, then why isn't everyone using them??)
The subsequent military operations get more and more abstract and "strategic", meaning that the way they are described is increasingly less detailed, to the point where we are told that an army wins, but not HOW they won. They just win because again, Cletus is a genius and what he said would happen happened.
And so we are constantly reminded (by Cletus himself more often than not) that Cletus is a genius and that the small army he eventually develops with tough mental and physical training is practically invincible, despite often facing up against armies orders of magnitude larger than them. But we are almost never shown HOW they are superior soldiers. They are so incredibly good that they barely need to shoot a gun or anything else. So they "just win".
The military battles truly devolve into nothing-battles. The final two operations are the perfect examples. In the first, they besiege a city for a couple of weeks and then pretend to retreat and attack another target, and the city's dumb leader decides to send their ENTIRE army out to chase them, INCLUDING TRANSPORTING THEIR STATIC TURRETS that were defending the city for no good reason, and guess what? This is exactly what Cletus predicted and they immediately ambush them and win and take over the city! This is not only absurd but it kind of also spits on the face of actual military tactics and military history.
The very last operation is somehow even worse. Cletus goes back to the planet where his people and his trained army is, and it turns out that his worse enemy, the leader of the big bad army was waiting for him and he's captured and is surrounded by the entire enemy force. And for once this guy is not gonna get overconfident with Cletus! He's so fed up with Cletus always winning that he is about to shoot him when... Cletus wins the war. How? Well, we're never shown! But he sure did win, because the WOMEN AND CHILDREN AND OLD PEOPLE in the planet turned out to be better soldiers than an entire galactic army off screen, because that's what Cletus trained them to be! WHAT??
What I never even mentioned was Cletus as a character and the cast that follows him. Why? Because they are treated even worse than the military tactics here. Since Cletus is a god-like genius that knows how everyone is going to behave, he is an emotionless military asshole to everyone, and everyone tolerates it because he gets results. But the more he wins, the more of an asshole he becomes, for no good reason. The solution to making the love interest fall in love with him even though she hated him since the beginning? Force her to marry you! And then have your kid and only mention him IN A SINGLE SENTENCE after he's all grown up, of course! What to do with your closest ally that has always been by your side? Start shunning him out of nowhere, then replace him with a character who literally hated your guts and tried to get you expelled, and then come back years later and tell him that it was because he knew he was going to rise up in rank by himself! All of this is an absurd way of writing a main character. His actions are seemingly redeemed by everyone, and all is forgiven, because he is Cletus, the man who can do no wrong!
For a book about a character that claims to perfectly understand human behavior, this book is ironically so drained of emotion and logic that it felt like a robot trying to figure out and mimic human behavior, in a milSF story. If you're a fan of military tactics (which should be the main draw to this), then maybe you'll get past all the many, many flaws here, including the military ones. But if not, I can't really recommend this unless you're interested in learning how a cerebral "genius" character can be so annoyingly and absurdly written.