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world war 1 timeline
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assassination of archduke ferdinand
Archduke Franz Ferdinand of Austria and his wife Sophie are shot to death by a Bosnian Serb nationalist during an official visit to the Bosnian capital of Sarajevo on June 28, 1914. The killings sparked a chain of events that led to the outbreak of World War I by early August. -
Austria-Hungary declares war on Serbia, beginning WW1
On 28 July, Austria-Hungary declared war on Serbia. It was determined to take decisive action against Serbia and, by now, knew this risked war with Russia, Serbia's supporter. Austria-Hungary was prepared to risk war because it had the guarantee of German support. The Balkan crisis now threatened a European-wide war.