Is shell shock/battle fatigue/PTSD a relatively modern condition

A Brief History About PTSD, How It's Recognition has Transformed

etymology - What causes the euphemisation of medical terms? - English Language & Usage Stack Exchange

Shell-Shocked Veteran - TV Tropes

New name for PTSD could mean less stigma - The Washington Post

PDF) Aging and Trauma: Post Traumatic Stress Disorder Among Korean War Veterans

How Veterans Created PTSD - JSTOR Daily

Is shell shock/battle fatigue/PTSD a relatively modern condition? Are there any documented examples from before WW1? - Quora

How PTSD went from 'shell-shock' to a recognized medical diagnosis

PDF) Psychiatric battle casualties: an intra- and inter-war comparison