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Archduke Franz Ferdinand is assassinated in Sarajevo. His death is the event that sparks World War I.
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Austria-Hungary declares war on Serbia, effectively beginning the First World War.
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On the afternoon of this day in 1914, two days after declaring war on Russia, Germany declares war on France.
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Emperor Franz Joseph of Austria-Hungary declares war on Serbia. As an ally of Serbia, Russia announces full mobilization of her armed forces.
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In fear of being surrounded by the might of Russia and France, Germany had put into being the Schlieffen Plan in response to the events that had occurred in Sarajevo in June 1914.
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On July 28, 1914, one month to the day after Archduke Franz Ferdinand of Austria and his wife were killed by a Serbian nationalist in Sarajevo, Austria-Hungary declares war on Serbia, effectively beginning the First World War.
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The Battle of Tannenberg was fought between Russia and Germany from 26-30 August 1914, during the first month of World War I.
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On September 9, the exhausted Germans began a fighting retreat to the Aisne River. The Battle of the Marne was the first significant Allied victory of World War I, saving Paris and thwarting Germany's plan for a quick victory over France.
