From 1939 to 1945, Georg Werthmann worked tirelessly to preserve the Catholic military chaplaincy of the German armed forces from Nazi Party interference. He and the men who worked under him valued their service as integral to the Catholic German soldiers in need of spiritual help; they also viewed the war in which they were engaged as a crusade against Bolshevism, an enemy to be beaten at any cost. The article focuses on the reactions of Werthmann and select chaplains and seminarians to two military regulations concerning the chaplaincy, and on their understanding of Bolshevism, revealing that Nazi and Catholic ideologies shared significant commonalities that encouraged their wartime service.