In October 1936 two German ships arrived in Spain loaded with a Panzer I company and all the services and personnel to establish Franco's army's first armored unit, the so-called Panzer-Gruppe Drohne. The Third Reich chose a pioneer in the development of German ground forces to command this contingent - Oberstleutnant Wilhelm Ritter von Thoma. This book presents the history of von Thoma's units in the Spanish Civil War, from the tank crews to the infantry, and specialties.