A lot of people are talking about the trauma of battle being as old as battle itself, which is true. But there is also absolutely measurable brain damage that occurs when you’re near lots of explosions, so as our use of explosives in battle ramped up, so did that brain damage.
When a bomb, mortar, or really big gun goes off near you, the shockwave travels through your brain and causes damage. WW1 had plenty of that.
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