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Archduke Franz Ferdinand and his wife, Sophie, are assassinated by a Bosnian Serb nationalist in Sarajevo.
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Austria-Hungary declares war on Serbia.
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Italy declares war on Germany, thus expanding the scope of its military activities beyond the Italian-Austrian Front.
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The Battle of the Somme, also known as the Somme Offensive, was a battle of World War I fought by the armies of the British Empire and French Third Republic against the German Empire.