One of my Favorite shows is Boardwalk Empire, a story shot in America just after WW1. One of the leading characters had half his face blown off in the War. He wears a protective mask to hide his disfigured face. WW1 was the first time for many they had to deal with mass amounts of men, troops coming back injured, wounded, badly scared etc.
Wounded Canadians en route to Blighty (England). Just look at the poor chaps, covered with bandages around the face, left with a life or pain and suffering.