Bulgaria during World War I 28 June 1914, Gavrilo Princip, a Bosnian-Serb student and member of Young Bosnia, assassinated the heir to the Austro-Hungarian throne, the Archduke Franz Ferdinand of Austria in Sarajevo, Bosnia. This began a period of diplomatic manoeuvring between Austria-Hungary, Germany, Russia, France and Britain called the July Crisis. Wanting to end Serbian interference in Bosnia conclusively, Austria-Hungary delivered the July Ultimatum to Serbia, a series of ten demands that were intentionally meant to be unacceptable in order to precipitate a war with Serbia. When Serbia acceded to only eight of the ten demands levied against it in the ultimatum, Austria-Hungary declared
To my peoples was made plural. After the assassination of Archduke Franz Ferdinand of Austria, heir to the Austro-Hungarian throne, and his wife Sophie in Sarajevo on June 28, 1914, diplomatic relations between Austria-Hungary and Serbia became strained. After weeks of discussions, government and army leaders of the Empire decided to risk war with Serbia, hoping for a short and victorious campaign. Emperor Franz Joseph signed the declaration of war in his Imperial Villa in Bad Ischl on July 28. The document was distributed all over the empire and was widely published on the morning of the next day. At this time, several