
The assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, on 28 June 1914, was a pivotal event that led to World War I. The assassin, Gavrilo Princip, was a 19-year-old Bosnian Serb with Serbian backing, seeking to free Bosnia and Herzegovina from Austria-Hungarian rule. Austria-Hungary's response to this assassination was swift and decisive. Suspecting Serbian involvement, they issued an ultimatum to Serbia, demanding an inquiry into the assassination, the suppression of anti-Austrian propaganda, and the eradication of terrorist groups within its borders. When Serbia resisted full compliance, Austria-Hungary broke diplomatic relations and declared war on Serbia on 28 July 1914, igniting a global conflict.
| Characteristics | Values |
|---|---|
| Date of the assassination of Archduke Franz Ferdinand | 28 June 1914 |
| Austria-Hungary's response to the assassination | Issued an ultimatum to Serbia, which was rejected |
| Outcome of the ultimatum | Austria-Hungary declared war on Serbia |
| Support for Austria-Hungary | Germany |
| Support for Serbia | Russia |
| Result | Initiated the First World War |
| Reason for the assassination | Free Bosnia and Herzegovina of Austria-Hungarian rule |
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What You'll Learn

Austria-Hungary's ultimatum to Serbia
On 28 June 1914, Archduke Franz Ferdinand of Austria-Hungary and his wife, Sophie, Duchess of Hohenberg, were assassinated in Sarajevo by a Bosnian Serb student named Gavrilo Princip. Princip was part of a group of six Bosnian Serb assassins who were members of a revolutionary group called Young Bosnia. The group sought to free Bosnia and Herzegovina from Austrian-Hungarian rule and unite all South Slavs into a Yugoslav state.
Convinced of Serbian government involvement, Austria-Hungary issued an ultimatum to Serbia on 23 July 1914, nearly a month after the assassination. Baron Giesl von Gieslingen, the ambassador of the Austro-Hungarian Empire to Serbia, delivered the ultimatum to the Serbian foreign ministry. The ultimatum demanded that Serbia accept an Austro-Hungarian inquiry into the assassination and the participation of Austrian officials in the investigation on Serbian territory. Additionally, it included harsh demands such as the suppression of anti-Austrian propaganda and the dismissal of Serbian officials deemed unacceptable by Austria-Hungary.
Serbia was given a 48-hour deadline to respond. If Serbia did not comply, Austria-Hungary threatened to sever diplomatic relations, which was an obvious precursor to war. Serbia's response, influenced by Russia's partial mobilisation, accepted most of the demands but rejected the participation of Austrian officials in the investigation on its territory. This rejection was a key factor in the escalation of tensions, as Austria-Hungary used it as a pretext for military action.
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Serbia's response to the ultimatum
On 23 July 1914, nearly a month after the assassination of Austrian Archduke Franz Ferdinand and his wife by a Serbian nationalist, Austria-Hungary delivered an ultimatum to the Serbian foreign ministry. The ultimatum contained six points, including demands that Serbia:
- Officially distance itself from the political campaign to unite the southern Slav peoples under Serbian leadership, challenging the territorial integrity of Austria-Hungary.
- Purge its army and civil service of anti-Austrian agitators.
- Suppress anti-Austrian propaganda in the Serbian press.
- Allow Austrian officials to participate in the investigation of the assassination and the prosecution of the ringleaders on Serbian territory, which would infringe on Serbian sovereignty.
Some historians interpret Serbia's response as a "highly perfumed rejection" of most points, while others argue that Serbia accepted all terms except for the demand concerning Austrian involvement in the investigation. Germany viewed Serbia's response as a "suitable basis for negotiation," and worked diplomatically to contain the ultimatum's effects. However, Austria-Hungary ultimately rejected Serbia's response, setting the stage for the outbreak of World War I.
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Austria-Hungary breaks diplomatic relations with Serbia
The assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, on 28 June 1914, was a pivotal event that eventually led to the outbreak of World War I. The assassination was carried out by Gavrilo Princip, a 19-year-old Bosnian Serb and member of a Bosnian Serb nationalist group seeking to unite territories with significant Serb populations under Serbian rule.
Convinced of Serbian government involvement, Austria-Hungary issued a series of harsh demands to Serbia, culminating in the July Ultimatum. This ultimatum stated that if Serbia did not accept all the demands within 48 hours, Austria-Hungary would recall its ambassador, signalling a break in diplomatic relations. Serbia's response fell short of full compliance, and as a result, Austria-Hungary published its grievances and severed diplomatic ties.
The July Ultimatum included ten demands, notably calling for an end to the smuggling of weapons and punishment for those who assisted the assassins. Serbia accepted some demands, such as agreeing to suppress the smuggling of weapons and punish those involved in the assassination plot. However, it rejected or partially accepted other demands, particularly those that infringed on its sovereignty, such as allowing Austrian officials to participate in the suppression of subversive activities within Serbia.
Austria-Hungary's decision to break diplomatic relations with Serbia was influenced by its perception that Serbian nationalism posed a significant threat to its interests and stability in the region. The assassination provided an opportunity to address the South Slav Problem, which had long been a source of concern for the Austro-Hungarian Empire. With German support, Austria-Hungary felt emboldened to take a hardline stance against Serbia, setting off a chain reaction of military mobilizations and alliances that ultimately led to the outbreak of World War I.
The breakdown in diplomacy and the escalation of tensions between Austria-Hungary and Serbia highlight the complex dynamics that contributed to the onset of World War I. The assassination of Archduke Franz Ferdinand served as a catalyst, exacerbating existing tensions and nationalist sentiments, ultimately leading to a global conflict that reshaped the world.
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Austria-Hungary declares war on Serbia
The assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, on 28 June 1914 was a pivotal moment in history that set off a chain reaction, ultimately leading to the outbreak of World War I. The assassination was carried out by Gavrilo Princip, a 19-year-old Bosnian Serb and member of a Bosnian Serb nationalist group seeking to unite territories containing ethnic Serbs under Serbia's rule.
In the aftermath of this assassination, Austria-Hungary quickly issued a series of harsh demands and an ultimatum to Serbia, convinced that the Serbian government had supported the assassins. This ultimatum, known as the July Ultimatum, included a 48-hour deadline for Serbia to accept all the demands, threatening to recall its ambassador otherwise. Serbia's response fell short of fulfilling all the demands, and as a result, Austria-Hungary broke diplomatic relations and declared war on Serbia on 28 July.
Austria-Hungary's declaration of war on Serbia set off a chain reaction of military mobilizations across Europe due to the complex system of alliances that existed at the time. Russia and France soon found themselves at war with Germany and Austria-Hungary, who were allies. This alliance between Germany and Austria-Hungary is known as the "blank check assurance," as Germany offered unconditional support to Austria-Hungary in the wake of the assassination.
The involvement of these major powers marked the beginning of World War I, as the conflict rapidly escalated and spread across the continent. When German forces invaded Belgium, Britain declared war on Germany on 4 August 1914, further expanding the conflict. The assassination and subsequent events highlighted the tense political climate and nationalistic sentiments that characterized pre-World War I Europe, with Serbia and Austria-Hungary representing opposing forces in the "South Slav Problem."
While the assassination of Archduke Franz Ferdinand was a key catalyst, it is important to recognize that there were other underlying factors and tensions that contributed to the complex dynamics of World War I. Nonetheless, the declaration of war by Austria-Hungary on Serbia was a significant turning point that pushed Europe towards the catastrophic conflict of World War I.
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Germany promises to support Austria-Hungary
On 28 June 1914, Archduke Franz Ferdinand of Austria-Hungary and his wife, Sophie, Duchess of Hohenberg, were assassinated in Sarajevo, the provincial capital of Bosnia and Herzegovina. The assassination was carried out by Bosnian Serb student Gavrilo Princip, who was part of a group of six Bosnian assassins. The political objective of the assassination was to free Bosnia and Herzegovina from Austrian-Hungarian rule and establish a common South Slav state.
Austria-Hungary issued a series of harsh demands to Serbia, convinced that the Serbian government had assisted Princip's group. This letter became known as the July Ultimatum, stating that if Serbia did not accept all of the demands within 48 hours, Austria-Hungary would recall its ambassador. Serbia's response was considered inadequate by Austria-Hungary, which responded by breaking diplomatic relations. This eventually led to the outbreak of World War I.
In the lead-up to the outbreak of World War I, Germany played a critical role in encouraging and supporting Austria-Hungary's punitive actions towards Serbia. On 5 July 1914, Kaiser Wilhelm II promised Germany's "blank cheque" or "blank check" assurance of full support to Austria-Hungary, even if it led to war with Russia. This pledge marked a decisive moment in the chain of events leading to World War I. Germany's backing transformed what could have been a localized conflict in the Balkans into a general European war.
At a meeting in Potsdam palace on 5 July, Kaiser Wilhelm II informed Austria-Hungary that it could "count on Germany's full support", even if "grave European complications" arose. He added that Austria-Hungary "ought to march at once" against Serbia. The German Emperor further assured that, even if Russia were to act in defence of Serbia, Germany would do everything in its power, including war, to support Austria-Hungary.
The Austro-German Alliance, formed in 1879, was a pact between Austria-Hungary and the German Empire in which both powers promised mutual support in the event of an attack by Russia. This alliance played a significant role in shaping Germany's decision to support Austria-Hungary during the July Crisis. Theobald von Bethmann-Hollweg, the Chancellor of Germany, also strongly advised Austria-Hungary to choose war over peace.
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Frequently asked questions
Austria-Hungary issued an ultimatum to Serbia, threatening to invade if its demands were not met.
The ultimatum demanded that Serbia accept an Austro-Hungarian inquiry into the assassination, suppress all anti-Austrian propaganda, and take steps to root out and eliminate terrorist organizations within its borders.
Serbia accepted all demands except for the inquiry into the assassination, stating that Austro-Hungarian involvement in the investigation would be a violation of its constitution and criminal procedure.
Austria-Hungary broke off diplomatic relations with Serbia, and on July 28, 1914, declared war on Serbia.
The assassination, coupled with a complex web of alliances and miscalculations of political and military leaders, led to the outbreak of World War I. By early August 1914, most of the major European states were engaged in armed conflict.






































