Today, 400 years ago, some angry Protestant Bohemian Lords tossed some Catholic Imperial Lords out of one of the windows of Prague castle. The Imperials survived the fall almost unharmed due to their thick coats and the slightly sloped wall underneath said window (no dung pile though, contrary to the popular legend). Although they got away unharmed, harm had been done anyway: This particular event kicked off one of the most gruesome and devastating conflicts in European history, the Thirty Years War. It ended with an immense decrease in population in the German countries (of which some would not regain their pre-war population until 100 years later) and also the further weakening of the already dying Holy Roman Empire, one of the last instances keeping up the old medieval feudal status quo. On the other hand, it resulted in a freshly independent new super power, the Republic of the Seven United Netherlands, and further strengthened the Swedish Empire (at the small cost of a king). And, dunno, probably some other stuff. Enlightening for example. "Why are you telling me this? This isn't even remotely medieval!", you will say. My response: Always build slopes (batters) at the base of your castle walls, it might save some Imperial's life some day. Unless you hate Imperials, of course.