WWI timeline By nevermindfamwegood Jun 28, 1914 Archduke Ferdinand Francis was assassinated Aug 28, 1914 Austria-Hungary declared war on Serbia Period: Sep 1, 1914 to Oct 3, 1914 Austrians lost in the Battle of Lemburg Feb 18, 1915 Germany attempted to blockade Great Britain Apr 22, 1915 Germans first used chloride poisonous gas May 7, 1915 German submarine sank the British ship Lusitania Jan 9, 1916 British troops withdraw from Gallipoli Apr 29, 1916 10,000 British troops surrender to the Turks Sep 15, 1916 British Army first used tanks Feb 1, 1917 British Army first used tanks Apr 6, 1917 The USA declared war on Germany Jun 26, 1917 First American troops land in France Jan 8, 1918 US President Wilson reveals “Fourteen Points” for peace Mar 3, 1918 Russian signs Treaty of Brest-Litovsk Mar 3, 1918 Allied forces reduced