The First World War ended 90 years ago. In Europe, this date is still celebrated as one of the main events of the 20th century. In Russia, it is actually forgotten . When the war began, we called it the “Second Patriotic War”. After graduation, it was celebrated as an "unfair", "invading", "imperialist massacre" .. Her story was slandered and cursed by Soviet propaganda, her heroes and exploits are erased from the people's memory. Of all the events of the grandiose four-year confrontation in the mass consciousness, only the death of Samsonov’s army in August 1914 and the Brusilov breakthrough remained. An objective study of the history of the First World War, an unbiased understanding of its lessons and combat experience were possible only in a professional environment, in a closed press intended for military specialists. This book is a collective work of the leading Soviet "military specialists" of the 1920s, in which former staff officers and generals of the tsarist army investigated the course and results of the recent war, analyzing their own mistakes and preparing for future battles. This is the deepest, most detailed and competent analysis of the fighting on the Russian-German front. The book is richly illustrated with unique photographs, most of which have not been published since 1917.