You can go into battle with the clearest, simplest, smartest plan ever devised, worked out by Annapolis-trained, battle-hardened Marine officers, and based upon tons of intelligence. But ten seconds after the first trigger has been pulled, shit is happening all over the place, people are running around like maniacs. The battle plan that was genius a minute ago suddenly looks as sweetly naive as the inscriptions in your high school year book. Guys are dying. Some of them are dying because a shell happens to fall on them, but surprisingly often, they are dying because they are ordered to.
Neal Stephenson, Cryptonomicon