The immediate causes lay in decisions made by statesmen and generals during the July Crisis of 1914, triggered by the assassination of Archduke Franz Ferdinand of Austria and his wife, Sophie, Duchess of Hohenberg, on 28 June 1914. The assassin, Gavrilo Princip, was an ethnic Serb and Yugoslav nationalist from the group Young Bosnia, which was supported by the Black Hand, a nationalist organization in Serbia.[4] The crisis escalated as the conflict between Austria-Hungary and Serbia came to involve Russia, Germany, France, and ultimately Belgium and Great Britain. Other factors that came into play during the diplomatic crisis that preceded the war included misperceptions of intent (e.g., the German belief that Britain would remain neutral), fatalism that war was inevitable, and the speed of the crisis, which was exacerbated by delays and misunderstandings in diplomatic communications.