More can be written about this. There is an FAQ section "Post Traumatic Stress Disorder" Where I saw reference to Romans in particular were "Are there any indications of combat PTSD in societies like the Spartans, Khan's or Alexander's armies?" by /u/sapere_avde and "Did men of the past suffer emotional trauma from war and killing?" by the same author. They generally talk about the problems of diagnosing centuries after the fact on meagre data, or on various cultures.

This is not to discourage discussion. Further questions, data, and debate are welcome.