This book is an attempt by a group of German military specialists and government officials to summarize the experience gained during the war of 1939–1945 and to draw some conclusions for the future, mainly based on an analysis of the decisions of the Wehrmacht operational leadership at the most important moments of the war on land, on sea and in the air. The book also examines the development of weapons and military equipment, the use of various types of transport, the organization of war financing, etc. The material in the collection is of significant interest when studying the history of the Second World War.