If I read /about wars in history I think about how brutal the fights face to face were. Did they society knew PTSD and if yes, how they treated it?
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, while u/hillsonghoods has a Monday Methods post on just why it's so complicated.