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

PTSD and the War of Words - Adam M. Chekroud, Hieronimus Loho, Martin Paulus, John H. Krystal, 2018

Vera Brittain and the Shell-Shocked Women of World War One - Historic UK

The Shock of War, History

From The Napoleonic Wars to Vietnam And Iraq: A History of War Trauma

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

During WWl, what was shell-shock? - Quora

Shell shocked

What is PTSD (Post Traumatic Stress Disorder) and why does in matter in highway crash cases?

Shell shock - Simple English Wikipedia, the free encyclopedia

A shell-shocked Ukrainian soldier in a trench is getting taken care of, location and date unknown : r/CombatFootage

Post-traumatic stress disorder - Wikipedia