The book "The Martyrdom of Belgium: An Official Report on the Mass Murders of Civilians, Women and Children by the German Army" is a key document that reveals the brutality of military operations during the First World War. The authors of the book - representatives of the Belgian Commission for the Investigation of Violations of Human Rights, Laws and Customs of War, Gerard Kooreman and others, describe in detail the terrible events that took place during the offensive of the German troops. This book documents the shootings of civilians, including women and children, as well as the destruction of cities, villages, and historical monuments. The report includes eyewitness accounts, statistical data and official documents testifying to the brutality of war crimes. This book has become an important source for understanding the tragedy of the German occupation during the war. "The Martyrdom of Belgium" is not only a historical document, but also a call to remember the victims and to defend humanitarian values in the conditions of war. This book leaves the reader with a deep impression of the brutality and suffering of the civilian population during the war, as well as a reminder of the importance of preventing similar tragedies in the future.