To borrow a famous line, the problem with most people trying to understanding the true nature of historical sword combat is not that they're ignorant — it's just that they know so much that isn't so. It's amazing, really, how a subject that so permeates our modern pop culture, and is so ubiquitous, is one which virtually no one any longer has any real world experience in, nor pursues for its original function. As a result, most all our conceptions of sword-fighting get it wrong. The reality of it is not what you think it is.