How did the First World War, the so-called 'Great War' - widely seen on all sides as 'the war to end all wars' - impact the development of German philosophy? Combining history and biography with astute philosophical and textual analysis, Nicolas de Warren addresses here the intellectual trajectories of ten significant wartime philosophers: Ernst Bloch, Martin Buber, Ernst Cassirer, Hermann Cohen, Gyorgy Lukacs, Martin Heidegger, Edmund Husserl, Franz Rosenzweig, Max Scheler and Georg Simmel. In exploring their individual works written during and after the War, the author reveals how philosophical concepts and new forms of thinking were forged in response to this unprecedented catastrophe. In reassessing standardized narratives of German thought, the book deepens and enhances our understanding of the intimate and complex relationship between philosophy and violence by demonstrating how the 1914-18 conflict was a crucible for ways of thinking that still define us today.