The assassination led to a month of diplomatic manoeuvring between Austria-Hungary, Germany, Russia, France, and Britain called the July Crisis. Believing correctly that Serbian officials (especially the officers of the Black Hand) were involved in the plot to murder the Archduke, and wanting to finally end Serbian interference in Bosnia,[38] Austria-Hungary delivered to Serbia on 23 July the July Ultimatum, a series of ten demands that were made intentionally unacceptable, in an effort to provoke a war with Serbia.