I’d suggest, without a depth of knowledge on the subject. That psychoanalysis was a relatively new science at the time of WW1. So even though PTSD was a thing, there really were no doctors who could diagnose it until that time. So suddenly, you have a new science with a sudden influx of patients with identical symptoms.
Remember, Europe was “relatively” peaceful after Napoleon was defeated. Psychoanalysis was born in that period of peace. So there were few psychiatrists and few soldiers with PTSD to diagnose.
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