Over the past twenty years, the cultural and social history of the Great War has undergone a profound revitalization and given rise to new areas of research, such as the history of the body and of violence, the relationships between the front lines and the home front, the “cultures of war,“ and religious feeling. At the heart of this approach is an interest in intimacy, or the private life of soldiers and their relationships with their loved ones, an area that has been explored thanks to a new focus on personal archives: letters, diaries, photographs. Taking wartime France as its example, this article analyzes the contributions of this new history of World War I and assesses its methodological issues. The Great War can thus be seen in its full measure, not only as the first conflict conducted on a global scale, but also as a true anthropological turning point, one that caused tremendous upheaval for those who lived through it: new kinds of violence on the battlefields, new mourning rituals, unfamiliar difficulties in reconnecting with private life in the aftermath of the war.