A fleet carrier is intended to operate with the main fleet and usually provides an offensive capability. These are the largest carriers capable of fast speeds. By comparison, escort carriers were developed to provide defense for convoys of ships. They were smaller and slower with lower numbers of aircraft carried.
The First World War was sparked in the Balkans in 1914 when members of Mlada Bosna, a revolutionary organization with predominately Serbian and pro-Yugoslav members, assassinated the Austro-Hungarian heir Archduke Franz Ferdinand of Austria in Bosnia and Herzegovina's capital, Sarajevo.
The reason the Balkans were the powderkeg of Europe was and still is to a certain extent the crossroads of Eastern and Western Europe.ince the start of the 20th century this region was in a state of continuous upheaval starting with the First and Second Balkan Wars in 1912 and 1913 respectively. In 1914, Archduke Francis Ferdinand was assassinated in Sarajevo by a Serbian.