My apologies if this isn't the proper sub or if the question is too vague since it is asking everything pre-1970s. I'm curious if it was called something different, embraced as a virtue, disregarded, or not even recognized as a thing during large scale and long long war events.
The question of war trauma and moral injury is now the subject of a pretty considerable subfield of the study of history, and it's impossible to answer your question comprehensively for all ages and places. But you'll be interested in this Monday Methods post by the esteemed /u/hillsonghoods on why it's not so easy to talk about "ancient PTSD".
It is but one example of one particular time, place, and social context, but I recently wrote about this answer in the context of the Soviet Union. https://reddit.com/r/AskHistorians/comments/fyqul9/how_did_the_red_army_in_the_second_world_war/
As the other answer in this thread mentions, it can be quite hard to situate mental conditions in their historical context, because it requires us to do the impossible - namely, to actually know for sure what the mindsets and mental experiences were of people in the past. Different social/cultural contexts will affect how people experience mental conditions, and there is some evidence that it doesn’t just affect how they describe their conditions but the symptomsas well. If you’re interested in getting deeper into this topic, I found Greg Eghigian’s From Madness to Mental Health: Psychiatric Disorder and Its Treatment in Western Civilization to be a good survey. It was the core text for a class I took in undergrad and it was pretty well liked by the history students as well as the psych students in that class.