Well it clearly should have killed even more cuz most survivors immediately became freikorps and then nazis.
"Ooh the youth of yurop was extinguished in the mud in a senseless infight"
Sadly not all of it, and I don't want to even think what would have looked like had they pointed their armies only outward, 100 vietnams but 50 years early
You can only call it Fascism if it affects the imperial core otherwise it's just sparkling colonialism.