Until recent years, very little was known of the tens of thousands of foreign nationals from Norway, Denmark, Holland, Belgium, France and Spain who served voluntarily in the military formations of the German Army and the German Waffen-SS. In Kaisergruber's book, the listener discovers important issues of collaboration, the apparent contributions of the volunteers to the German war effort, their varied experiences, their motives, the attitude of the German High Command and bureaucracy, and the reaction to these in the occupied countries.