What term was used by Germans to refer to the Marines' fighting ability in 1918?

The term "Devil Dogs" was used by German troops during World War I to refer to U.S. Marines, particularly in 1918. This nickname emerged as the Marines were known for their fierce fighting spirit, tenacity, and relentless combat prowess on the battlefield, especially during operations like the Battle of Belleau Wood.

The Germans were reportedly impressed by the Marines' ability to withstand heavy fire and their aggressive fighting style, which led them to describe the Marines as "Teufel Hunden"—translated as "Devil Dogs." This nickname not only captured the respect that the enemy had for these soldiers but also played a significant role in the identity of the Marine Corps, emphasizing bravery and resilience in the face of adversity.

Other terms, while they may have association with military themes or the Marine Corps, did not originate from German forces during this period.