Balance of power By dodabug14 Jun 28, 1914 Assassination of Archduke Franz Ferdinand heir throne Austro - hungarian Jul 28, 1914 Austria - Hungary declared war with Serbia Austria wanted war with Serbia Jul 29, 1914 Austria - Hungary invades Serbia repeatedly repulsed July 29 - December 9 Austria - Hungary invades Serbia Aug 1, 1914 outbreak war of Germany declares war with Russia War of Germany with Russia Jan 15, 1915 Japan's 21 demands on china Japan's21 demands Jan 19, 1915 First German Zepplin attacked on England January 19 - 20 German attacked on England Feb 4, 1915 German U - boat attacks allied and shipping declares Blockade on Britain German attacks Britain Apr 25, 1915 Allied landed on Gallipoli Allied landed on Gallipoli
