June 28 - Assanation of Franz Ferdinand.
July 28 - World War I begins. Austria-Hungary declares war on Serbia.
August 1 - Germany declares war on Russia.
August 2 - Germany conquers Luxembourg.
August 3 - Germany declares war on France
August 4 - Germany declares war on Belgium, United Kingdom declares war on Germany.
August 5 - Battle of Liėge starts.
August 6 - Austria-Hungary declares war on Russia. Serbia declares war on Germany.
August 11 - France declares war on Austria-Hungary.
August 12 - United Kingdom declares war on Austria-Hungary.
August 16 - Battle of Liėge ends.
August 17 - Battle of Tannenburg starts.
August 20 - Germany occupies Brussels.
August 23 - Japan joins the Allies
August 28 - Battle of Heligoland Bight.
September 6-September 7 - Battle of Marne.
October 9 - Belgium falls to Germany
November 1 - The Ottoman Empire joins the Central Powers