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Francis Ferdinand was assassinated at Sarajevo.
The assassination of Archduke Franz Ferdinand on 28 June 1914, set in train a series of diplomatic events that led inexorably to the outbreak of war in Europe at the end of July 1914. -
Austria declared war on Serbia
Austria-Hungary determined that the proper response to the assassinations of Francis Ferdinand was to prepare for a possible military invasion of Serbia. -
Germany declared war on Russia
Germany declared war on Russia -
Germany declared war on France and invaded Belgium.
Germany declared war on France and invaded Belgium. -
Turkey entered the war on Germany’s side. Trench warfare started to dominate the Western Front.
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USA declared war on Germany
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Britain launched a major offensive on the Western Front.
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British tanks won a victory at Cambrai