English summary: Emile Chartier, the French philosopher and intellectual, joined the army in August 1914. The present volume collects the letters he wrote describing his experience as a pacifist engaged in the First World War. Written from the trenches, between artillery volleys, Chartiers letters offer style and humanity in face of death and carnage. French description: Alain a quarante-six ans quand il s'engage, en aout 1914, pour...