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An anti-Austrian demonstration in front of the national theatre in Belgrad in July 1914..Set off by the deadly shots on Austrian heir to the throne Franz Ferdinand by Serbian nationalists on the 28th of June in 1914 in Sarajevo, World War I broke out. During World War I, Germany, Austria, Austria-Hungary as well as later Turkey and Bulgary fought against Britain, France and Russia. The sad end result in 1918 comprised roughly 8.5 million soldiers killed in action, more than 21 million wounded and almost 8 million prisoners of war and missing people. (KEYSTONE/DPA/dpa)