[quote=@ClocktowerEchos] Humans are good at killing each other, not necessarily good at doing war though. You have to remember, we think some things as obvious because we have hindsight and a wealth of knowledge available to us. Line formations was once considered revolutionary and pulling off maneuvers like hit and run, bait and switch or even flanking can be surprisingly difficult. Part of modern military training is specifically designed to teach soldiers how to do battle beyond "shoot that dude". Also books can start to look like shit after one year of mishandling. Books being mistreated for a hundred years well... unless you have some very dedicated librarians and book keepers, you probably are going to be missing a lot of pages. [/quote] Yes, but the point is that once warfare was going on, many things would be quick to learn. Humans are good at problem-solving. Sure, such maneuvers can be difficult in execution, but they're still fairly obvious (all of them have been used since pre-history, we can't really say how hard it was for humans to learn them). It all is really dependent on other factors— like the efficiency of the command structures used. Line formations were considered useful because of the limitations of technology at the time they were developed. When technology advanced and made them obsolete, they were abandoned in short order. The US constitution has survived for 230 years. The dead sea scrolls for over 2,000 years. Not saying there are a ton of them laying around, but they'd be sorta like fossils. If by chance a room with some books in them was sealed off sufficiently from the elements, it's possible something survived. Again, should ask the GM about it.