WW1 By Elene_Alkorta Period: 1914 to 1918 WW1 Jun 6, 1914 Threat of possible war Jun 28, 1914 The war machinery was prepared Jul 23, 1914 Vienna gave an ultimatum to Belgrade Jul 28, 1914 Russia allied with Serbia and sent a troop to the border Jul 28, 1914 Austrian guns fire Belgrade Aug 1, 1914 Alemania declares war to Russia Aug 2, 1914 General order of mobilization in France Jun 28, 1919 The Treaty of Versailles As the most important treaty of World War I, it ended the state of war between Germany and most of the Allied Powers.