After the assassination of the archduke, Austria-Hungary declared war on serbia. This is where revenge comes into 5+1=war. Serbia had alliance with Russia who declared war on Austria- Hungary on July 29th 1914. Austria-Hungary had an alliance with Germany who then had declared a war
After the assassination of the archduke, Austria-Hungary declared war on serbia. This is where revenge comes into 5+1=war. Serbia had alliance with Russia who declared war on Austria- Hungary on July 29th 1914. Austria-Hungary had an alliance with Germany who then had declared a war