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This is the introduction to a collection of articles to be published in the Valparaiso University Law Review. The articles address the challenges presented by non-traditional warfare and non-traditional combatants in the contexts of the War on Terror and the trend toward multilateral and humanitarian interventions. Two of the contributions, those of Jonathan Hafetz and David Frakt, detail the hybrid model, part criminal law, part law of war, that the United States developed for addressing the status of detainees in the War on Terror. Two of the contributions, those of Rachel VanLandingham and Iain Pedden, propose international models for addressing the challenges of the new warfare, while Laurie Blank advocates a new focus on enforcement at both the national and international levels to address violations of the principle of distinction. Read together, the articles in this collection present a convincing argument that the United States needs to work with other states and international organizations to forge international solutions to the international problems posed by the new warfare.