World War One Timeline by Conor O'Doherty By MrHostetter Jun 28, 1914 Archduke Ferdinand is assassinated. Period: Jun 28, 1914 to Nov 11, 1918 World War One Jul 28, 1914 Austria-Hungary declares war on Serbia. Aug 3, 1914 Germany declares war on France. Aug 4, 1914 Britain delares war on Germany. Aug 12, 1914 Great Britain and France declare war on Austria-Hungary. Jan 19, 1915 First airship raid on England. Feb 26, 1915 Liquid fire first used by the Germans on the Western front. May 7, 1915 S.S. "Lusitania" sunk by German submarine "U.-20" off Queenstown. Aug 21, 1915 Italy declares war on Turkey. Oct 19, 1915 Russia and Italy declare war on Bulgaria. Feb 21, 1916 The Battle of Verdun Begins. The Battle of Verdun was one of the major and bloodiest battles of WWI. Nov 21, 1916 British hospital ship "Britannic" sunk by mine in Ægean Sea. Apr 6, 1917 The United States declares war on Germany. Aug 14, 1917 China declares war on Germany and Austria-Hungary. Aug 14, 1917 China declares war on Germany and Austria-Hungary. Oct 26, 1917 Brazil declares war on Germany. Dec 7, 1917 United States of America declare war on Austria-Hungary. Jul 12, 1918 Haiti declares war on Germany. Aug 13, 1918 Czecho-Slovakia declares war on Germany. Jun 28, 1919 The Treaty of Versaillies is signed.
