This book is a sequel to Instruments of Peacemaking 1870-1914 in that it considers how attempts were made to settle disputes between states without recourse to war after ‘the war to end all wars’. It considers the idealism of President Woodrow Wilson's Fourteen Points which formed the basis for the Armistice in 1918, and his scheme for a League of Nations providing for self-determination of nations and ‘collective security’ for European states. It goes on to analyse the key challenges that faced statesmen and jurists in attempting to resolve disputes under the provisions of the Treaty of Versailles. It considers the consequences of the Peace Conference of 1919 as well as defects in the treaty as an instrument for resolving future disputes and tensions between the victors and the vanquished. Cases referred to the Reparations Commission and to arbitration under the Treaty of Versailles regarding boundary, industrial property, and shipping including the Lusitania claims are considered.