WW1 at a glance By 26trostlee Jun 28, 1914 Assassination of archduke Franz Ferdinand Jul 28, 1914 Austria-Hungary declares war on Serbia, this is the first war of WW1 Dec 19, 1914 The first battle of Ypres is fought Feb 19, 1915 Gallipoli campaign begins May 7, 1915 Germany sinks the British owned lusitania Jul 1, 1916 The battle of the somme Apr 6, 1917 The United States enters the war Mar 3, 1918 Russia signs the Treaty of Brest-Litovsk with Germany Nov 11, 1918 US signs the Armistice Jan 18, 1919 Peace conference begins at paris