This article describes the public mental health approach used to develop and implement a school-based postwar trauma/grief intervention program for adolescents in Bosnia-Herzegovina. This approach includes development of multilateral partnerships with local and ministerial stakeholders, systematic assessment that yields a detailed understanding of the specific range and severity of trauma and loss experiences, current adversities and trauma reminders among the affected population, and a training program aimed at developing the capacities of local service providers and an indigenous support infrastructure so that the intervention program may be directed and sustained by people within the communities served. Concluding comments detail an expanded conceptual framework for public mental health interventions that may be appropriate for terrorist and mass-casualty events.