An account traces the later decades of Clara Barton’s life, beginning with her discovery of the international Red Cross while seeking health abroad and the illness that followed. It follows her solitary campaign to introduce the movement to American officials, the long effort to secure national acceptance of the international treaty, and the practical and political challenges of turning a personal crusade into an organized society. Chapters describe the organization’s growth, internal and external trials as it achieved prominence, and its peacetime humanitarian work, including operations in Cuba. The narrative closes with reflections on her religion, character, final years, retirement, and commemoration.