Managed to answer some questions I had about this by finding this site. http://www.axishistory.com/index.php?id=6299 One point struck me as ironic. Since Germany was allied with the Soviet Union at the time, the official German line forbade enlistment of German volunteers The numbers of Volunteers are lower than I'd have thought, as it would have been a good chance for some with anti-Communist leaning to have a go at the Red Army. Many perhaps saw the need to stay at home and defend their countries from the looming Nazi threat. Lots of Volunteers went to the Spanish Civil War a few years earlier but it was warmer there.