Nothing a few bursts of .50cal through a building can't deal with!
In all seriousness though. Look at the havoc the Fallujah sniper wrought. I can tell at least a few Marines were worried to strap their body armour on for patrol during those days.
Also I am sure that it was understood back in antiquity that battle changed a man, and not all men could deal with the change. They didn't understand it as we do today, but we don't even understand it today either. Shellshock was widely unheard of until The Great War. Soldiers unharmed by shrapnel were still coming off the line as casualties of war. This however is a totally different form of PTSD than what we're talking about.
I'm very sure Romans returning from Caesars conquest of Gaul were haunted by the massacre of the women and children and had many many many sleepless nights. I know I would.
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