Questions on mechanics and rules

Mustard gas burns seems an obvious and pretty horrific one.

Gunshot wound to the arm, maybe he got gassed?

If you’ve ever seen Ms Fisher Mysteries it takes place about this period of time and there’s a couple episode that deal with the troubles veterans had after the war. There’s on with a mustard gas survivor.

Certainly more rare than the other allies or central powers, but the US had 4 million mobilized during the Great War.

As others have said, chemical burns would be one obvious possibility; gunshot wounds would be far more common, though have less flavor. Artillery played a huge role in the war, as did barbed wire. Really, it could be just about anything - there wasn't much that wasn't tried in WWI.

Thanks again everyone for the advice and suggestions.

No problem, I love the era, that attracts me more than the going insane and dying.