World War One By valeriaduran Jun 28, 1914 Archduke Franz Ferdinand is assassinated Period: Jun 28, 1914 to Jun 28, 1919 World War One Jul 28, 1914 Austria declared war on Serbia Aug 1, 1914 Germany declared war on Russia Aug 4, 1914 Britain declared war on Germany Oct 18, 1914 First Battle of Ypres May 7, 1915 The “Lusitania” was sunk by a German U-boat May 23, 1915 Italy declared war on Germany and Austria Apr 16, 1917 USA declared war on Germany Jul 31, 1917 Start of the Third Battle at Ypres Nov 3, 1918 Austria made peace Nov 11, 1918 Germany signed an armistice with the Allies – the official date of the end of World War One Jun 28, 1919 The Treaty of Versailles was signed by the Germans
