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 Balkans were known as the Powder Keg of Europe because of its constant disagreements regarding land distribution and an extreme sense of nationalism, which made the area a hot bed for small conflicts and larger wars. The Balkans had this title throughout the beginning of the 20th century, before World War I.