On Limited Force: Prudence Below the Threshold of War

This article asks how military ethics should respond to adversaries deliberately conducting hostilities below the threshold of war. Three options are considered: a novel, limited force paradigm; an expanded hostilities paradigm, i.e., within the law of armed conflict; and an international law enforcement paradigm derived primarily from human rights law. None is problem-free. Mindful of under-deployed classic just war reasoning arguments for discrimination between vices opposed to peace, this article argues against an expanded hostilities paradigm and shows that the retributive, ‘equilibrium of justice’ test used sometimes to support such an expansion is necessary but not sufficient. It explains the need for further examination of whether/how Aquinas and his interpreters can/should conceive of actions under the paradigm of war occurring against non-state actors.