The Treaty of Versailles was a peace treaty that officially ened World War I. It was signed on June 28, 1919, exactly 5 years after the assassination of Archduke Franz Ferdinand, one of the events that triggered the start of the war. Although the armistice signed on November 11, 1918 put an end to the actual fighting, it took six months of negotiations at the Paris Peace Conference to conclude a peace treaty. Of the many provisions in the treaty, one of the most important and controversial provisions required Germany and its allies to accept full responsibility for causing the war and, under the terms of articles 231-248, disarm, make substantial territorial concessions and pay reparations to certain countries that had formed the Entente powers. The Treaty was undermined by subsequent events starting as early as 1922 and was widely flouted by the mid-thirties.