The Germans were also horrified by our use of 12 gauge buckshot trench guns. They filed a formal diplomatic protest at the use of a barbaric weapon.
One of the stories told in the Marine Corps was that when the Marines first arrived and dug into their positions, the Germans moved up to within 100 yards and began setting up their camp in plain view.
Naturally, the Marines started picking off the German soldiers, who promptly moved back to 200 yards to set up camp.
The Marines resumed picking off Germans, who retreated another 100 yards.
This continued until they were 600 yards away. The Marines finally stopped to settle in for the night.