Description: In August 1914, the day after Germany declared war on France, Marc Bloch, who would become one of the great historians of the 20th century, left Paris to join the front. As an infantry officer, he shared with his comrades the harsh daily life in the trenches, the chaos of the clashes with the enemy, the fear of death always lurking, and the pain of numerous losses. From those terrible years, from which he emerged with his conscience intact as a historian, he offers us in "War Memoirs 1914-1915" a passionate account imbued with a sober humanity, which makes it a unique testimony of history lived firsthand and narrated by one of the most prestigious researchers in history. This individual experience would later be reconsidered by Bloch in "Reflections." The historian studies war as "an immense experiment in social psychology" and, starting from the collective moods that allow prejudices to transform a bad perception into legend, he analyzes the formation and dissemination of false news that circulated in the trenches. Thus, he embarks on a path of research that will mark all his work, contributing to the development of a fertile school of thought that is still highly relevant today.