Marines were ordered to take a hill occupied by German forces at the battle for Belleau Wood during WWI. As the Marines
fought their way up the hill, the heat caused them to sweat profusely, foam at the mouth and turned their eyes bloodshot.
Additionally, at some points the hill was very steep, which caused the Marines to have to scramble on all fours to make their
way up. Consequently, from the Germans' vantage point, they witnessed a pack of tenacious, growling figures whose lower
faces were obscured by gas masks (which at the time had a prolonged shape that somewhat resembled a snout) killing everything
in their way. As the legend goes, the German soldiers, upon seeing this spectacle, began to yell that they were being attacked
by "dogs from hell" or Teufel Hunden.
The Teufel Hunden Chapter is located in western PA (Pittsburgh