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World War I Begun.
War broke out unexpectedly following the July Crisis in 1914. Austria-Hungary declared war on Serbia, followed quickly by the entry of most European powers into the First World War.
Finally, on 28 July 1914, a month after the assassination, Austria-Hungary declared war on Serbia.
When the First World War broke out in 1914, Edward had reached the minimum age for active service and was keen to participate.