to Constantinople and the Middle East. Serbia relied primarily on Russia for Great Power support but Russia was very hesitant at first to support Pan-Slavism, and counselled caution. However, in 1914 it reversed positions and promised military support to Serbia. World War I The 28 June 1914 assassination of Austrian Crown Prince Franz Ferdinand in Sarajevo, by Gavrilo Princip, a pro-Serbian member of Young Bosnia served as the basis for the Austrian declaration of war on Serbia on 28 July 1914. Vienna acted despite Serbia's acceptance three days earlier of nearly all of Vienna's demands. Vienna was convinced that Serbia was behind the plot in an effort to destabilize the multi-nation empire. The Austro-Hungarian army invaded Serbia capturing Belgrade on 2 December 1914, however the Serbian Army successfully defended the country, won several victories, and on 15 December 1914 recaptured Belgrade. On 28 July 1914, Austria-Hungary declared war on Serbia. Within days, long-standing mobilization plans went into effect to initiate invasions or guard against them and Russia, France and Britain stood arrayed against Austria and Germany in what at the time was called the "Great War", and was later named "World War I" or "First World War." Austria thought in terms of one small limited war involving just the two countries. It did not plan a wider war such as exploded in a matter of days. British historian John Zametica argued that Austria-Hungary was primarily responsible for starting the war, as its leaders believed that a successful war against Serbia was the only way it could remain a Great Power, solve deep internal disputes caused by Hungarian demands, and regain influence in the Balkan states. Others, most notably Prof. Christopher Clark, have argued that Austria-Hungary, confronted with a Serbia that seemed determined to incite continual unrest and ultimately acquire all of the "Serb" inhabited lands of the Monarchy (which, according to the Pan-Serb point of view included all of Croatia, Dalmatia, Bosnia, Hercegovina and some of the southern counties of the Hungary(roughly corresponding to today's Vojvodina), and whose military and government was intertwined with the irredentist terrorist group known as "The Black Hand," saw no practical alternative to the use of force in ending what amounted to subversion from Serbia directed at a large chunk of its territories. In this perspective, Austria had little choice but to credibly threaten war and force Serbian submission if it wished to remain a