A bit of context. Those Greek soldiers at the time were coming out of almost 8+ years of uninterrupted fighting. They fought the Italians, fought the Nazis, when occupied they went partisan or joined foreign Allied contingents, and after that fought a civil war at home. The Greeks were at war from 1940 to 1949. So their units probably had a lot of veterans among them plus younger men who grew up at war. Not surprising they were though as nails.