There were about 44 million casualties in World War I, or the Great War. ~15-20mil of those casualties ended w/ (with) death. The rest (22mil) survived, but were wounded. Back then, PTSD didn't exist, and this was the first time PTSD was recognized medically, however it was called Shell Shock. 21 years later (1918-1939), World War II began. *A lot of these men who survived World War I fought in World War II.

*Let's say that a man who enlisted at 17-18 in World War I, by the end of the war, 4 years later, they would've been ~21-22, meaning that when 1939 rolled around, and if they were British, French, or whatever (America joined in 1941), they would've been ~42-43.

PS, I've been one day ahead since the Dracula post. ToT