world war 1 (1914-1918) By caz007 Aug 3, 1914 Germany declares war on France and Belgium.[7] Aug 17, 1914 The Russian army enters East Prussia. Battle of Stalluponen. Aug 20, 1914 The Germans attack the Russians in East Prussia. The attack is a failure in addition to being a deviation from the Schlieffen Plan.[13] May 1, 1915 Battle of Gorlice-Tarnów: the German troops under General Mackensen break through the Russian lines in Galicia. Feb 13, 1916 Battle of Erzurum. Jan 19, 1917 Battle of Rafa. The British drive the Ottomans out of Sinai. Oct 24, 1918 Battle of Vittorio Veneto. The Austro-Hungarian army is routed. The Italians enter Trent and land at Triest. Jan 18, 1919 Treaty of Versailles between the Allies and Germany: the Peace Conference opens in Paris Oct 13, 1921 Treaty of Kars between Bolshevik Russia and Turkey. Jan 27, 1924 Treaty of Rome between Italy and Yugoslavia. Fiume is annexed by Italy and the neighboring town of Sušak is assigned to Yugoslavia.