The event that began on November 11, 1918, at 11 AM, was the armistice that ended World War I. This moment marked the cessation of hostilities on the Western Front, effectively ending four years of devastating combat that involved multiple nations and caused immense loss of life. The armistice was signed between the Allies and Germany, leading to the eventual Treaty of Versailles in 1919. This ceasefire allowed for the beginning of peace negotiations and laid the groundwork for significant geopolitical changes in Europe. November 11 is now commemorated as Armistice Day in many countries, recognizing the sacrifices of those who served in the war.