The nature of combat seems so much more brutal compared to modern times, but at the same time, violence seemed more acceptable compared to today. Soldiers also seemed to have been part of armies for a longer period of their life compared to today. How did this play a part on the psychology of those who fought in medieval conflicts?
It's a complicated matter, made even more so by the inherent difficulty of psychoanalysing a long-dead person from a wholly different cultural background at a distance of years or centuries. u/Iphikrates examines the matter in this post (it deals mainly with the Greeks, but many of the same concerns hold true for the Middle Ages), while u/hillsonghoods has a Monday Methods post on just why it's so complicated.