August 4, 1914. Germany sends second ultimatum to Belgium, threatening force, and offers Great Britain not to annex Belgian territory. Great Britain demands that Germany respect Belgian neutrality, and in default of reply declares war on Germany.
August 5, 1914. Austria-Hungary declares war on Russia.
August 6, 1914. Montenegro declares war on Austria-Hungary.
August 9, 1914. Serbia declares war on Germany.
August 10, 1914. France declares war on Austria-Hungary.
August 12, 1914. Great Britain declares war on Austria-Hungary.
August 12, 1914. Montenegro declares war on Germany.
August 23, 1914. Japan declares war on Germany.
August 27, 1914. Austria-Hungary declares war on Japan.
August 28, 1914. Austria-Hungary declares war on Belgium.