Most of human recorded history has shown we have been in and out of war for most of our existence, so (what I make in assumption), in that time what we now call Post Traumatic Stress Disorder (PTSD, previously called shell shock; the 1000 yard stare) has no doubt been a part of soldiers' lives

How was this condition been treated and managed, or otherwise what view did it have and how was it understood by society, particularly in ancient times through the Middle Ages and the Renaissance in comparison to today?