https://www.mca-marines.org/leatherneck/bookr...orld-war-i
https://en.wikipedia.org/wiki/Devil_Dog
Sie waren Teufelshunde. – They were Devil Dogs.Er war ein Teufelshund. – He was a Devil Dog.Er sprach von den Teufelshunden. – He talked about the Devil Dogs.
Furthermore, the word "Teufelshund", though not unknown in the German language, is rare, and this use may possibly be an example of Denglisch. The more common equivalent is "Höllenhund" ("dog of hell" or "hellhound"