World War I By alisynbynum Jun 28, 1914 Archduke Francis Ferdinand and his wife Sophie was assasinated in Sarajevo, Bosnia by Gavrilo Princip Jun 28, 1914 Austria-Hungary declares war on Russia Period: Jun 28, 1914 to Nov 11, 1918 World War I Apr 22, 1915 Germany begins using Gas Bombs on the Enemy Aug 1, 1915 France Begins Preparing for War Aug 3, 1915 Germany Declares War on France Feb 25, 1916 Fort Douaumont falls to Germans during during battle of Verdun Dec 15, 1916 French Army Recaptures Land Lost From Battle in Verdun Battle Apr 6, 1917 The US Declares War on Germany Oct 23, 1917 American Troops stationed in France Fire First Shot on Germany Nov 1, 1918 Americans Break Through German Defences at Meuse Nov 11, 1918 At 11 am a treaty was Signed to Temporarily end the War