Germany was at the forefront of the development of armored cars during the First World War. In the early 1920s, the "Zusatz von Bologne" which was an amendment to the Treaty of Versailles allowed the German Army to produce armored cars primarily for policing duties and eventually this gave rise to the military Sd.Kfz.13 series in the early 1930s . This publication covers German 4-wheeled cars in great photographic detail, focusing on the armored cars and their crews as they dealt with the conditions and circumstances in which they found themselves. Rare photographs from the author's own collection have been used to illustrate this book; they were taken by ordinary German soldiers not by official army cameramen whose images are already well known to enthusiasts.