
On July 28, 1914, Austria-Hungary declared war on Serbia, marking the beginning of World War I. This declaration came a month after Archduke Franz Ferdinand of Austria and his wife were assassinated by a Serbian nationalist in Sarajevo. Austria-Hungary, threatened by Serbian ambition in the Balkans, responded to the assassinations by preparing for a possible military invasion of Serbia. With the support of Germany, Austria-Hungary presented Serbia with an ultimatum, demanding the suppression of anti-Austrian propaganda and the ability to conduct their own investigation into the archduke's killing. Despite Serbia accepting nearly all of Austria's demands, the Austrian government broke diplomatic relations and pursued military action. This decision was influenced by the hawkish attitude of the Austrian military and government, who saw war with Serbia as inevitable due to tensions over Balkan territories and the rise of Slav nationalism.
| Characteristics | Values |
|---|---|
| Date of declaration of war | 28 July 1914 |
| Reason | Assassination of Archduke Franz Ferdinand by a Serbian nationalist |
| Support | Germany |
| Result | Beginning of World War I |
| Outcome | Serbia conquered and divided into separate occupation zones; Austria-Hungary destroyed |
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What You'll Learn

Austria-Hungary's ultimatum to Serbia
The assassination of Archduke Franz Ferdinand of Austria and his wife by a Serbian nationalist in Sarajevo on June 28, 1914, provided the Austro-Hungarian government with a reason to confront Serbia. The Austro-Hungarian foreign office decided to use the opportunity to address the "Serbian danger" and sought the support of Germany.
- Suppress all anti-Austrian propaganda within Serbia and prevent any negative information about Austria-Hungary or its Emperor from being spread.
- Remove all Serbian nationalist organizations, including the "Narodna Odbrana."
- Allow Austro-Hungarian representatives to enter Serbia and investigate the assassination of Franz Ferdinand, with Serbian officials being dismissed at Austria-Hungary's discretion.
- Remove and arrest individuals in the Serbian government deemed responsible for anti-Austria actions.
- Collaborate with Austro-Hungarian representatives in Serbia to suppress organizations hostile to Austria-Hungary and to participate in judicial proceedings against their members.
- Take measures to prevent the dissolved societies from continuing their activities under different names.
- Eliminate from public instruction in Serbia anything that serves to foment propaganda against Austria-Hungary.
- Remove from military service and administration all officers and functionaries guilty of propaganda against the Austro-Hungarian Monarchy.
Serbia's response to the ultimatum was delivered on July 25, 1914, and was considered insufficient by Austria-Hungary, despite Serbia accepting all demands except for a few that entailed constitutional changes in their government. As a result, Austria-Hungary broke off diplomatic relations with Serbia and proceeded with military preparedness measures, ultimately declaring war on July 28, 1914, marking the beginning of World War I.
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Serbian nationalism
The Austro-Hungarian government, with the support of Germany, drafted an ultimatum holding the Serbian government responsible for the assassination and making several demands. These demands included the suppression of anti-Austrian propaganda in Serbia and the involvement of Austro-Hungarian officials in the investigation of the archduke's killing. While Serbia accepted all demands except for one, which entailed constitutional changes, the Austro-Hungarian government was not satisfied and broke off diplomatic relations.
The tensions between Austria and Serbia had been building for some time due to Serbian ambitions in the Balkans region and the annexation of Bosnia by Austria, which inflamed pan-Serb sentiment. Serbian nationalism was further angered by the Austro-Hungarian Compromise of 1867, which placated Hungary but did not recognize Serbian claims. The Pig War of 1906-1909 and the diplomatic crisis over the annexation of Bosnia contributed to the growing nationalism among Serbs.
Following the assassination of the Archduke, the Austro-Hungarian government saw an opportunity to punish Serbia for its alleged support of the assassins and to curb Slav nationalism. The ultimatum presented to Serbia was deliberately provocative and designed to lead to war, as Austria-Hungary had already decided on a military invasion. Serbia's response, which agreed to most demands but asserted its sovereignty, was deemed insufficient by Austria-Hungary, leading to the declaration of war on July 28, 1914, marking the start of World War I.
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The assassination of Archduke Franz Ferdinand
The political objective of the assassination was to free Bosnia and Herzegovina of Austrian-Hungarian rule and establish a common South Slav ("Yugoslav") state. The Archduke was an advocate of increased federalism and widely believed to favour trialism, under which Austria-Hungary would be reorganised by combining the Slavic lands within the Austro-Hungarian empire into a third crown. A Slavic kingdom could have been a bulwark against Serb irredentism, and Franz Ferdinand was therefore perceived as a threat by those same irredentists.
The assassination was carried out by a group of six Bosnian assassins, five of whom were Bosnian Serbs and members of a student revolutionary group that later became known as Young Bosnia. The assassins were Gavrilo Princip, Muhamed Mehmedbašić, Vaso Čubrilović, Nedeljko Čabrinović, Cvjetko Popović, and Trifko Grabež, coordinated by Danilo Ilić. Princip later stated to the court that preventing Franz Ferdinand's planned reforms was one of his motivations.
In the days following the assassination, the Austro-Hungarian foreign office decided to use the opportunity for a final reckoning with the Serbian danger. They sought and received the support of Germany and drafted an ultimatum putting the responsibility for the assassination on the Serbian government and demanding full satisfaction. The ultimatum was handed to the Serbian government on July 23, demanding, among other things, that all anti-Austrian propaganda within Serbia be suppressed, and that Austria-Hungary be allowed to conduct its own investigation into the archduke's killing. The Serbian answer, handed in on July 25, was declared insufficient, although Serbia had agreed to all Austro-Hungarian demands except for two that entailed constitutional changes in the Serbian government.
On July 28, 1914, one month after the assassination, Austria-Hungary declared war on Serbia, effectively beginning World War I.
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Serbian and Austrian ambitions in the Balkans
Serbian ambitions in the Balkans were largely driven by the desire to establish a Greater Bulgaria and to reclaim what they considered to be 'Serbian soil'. Serbian irredentism led to armed uprisings by Bosnian Serbs against the Ottoman rulers in Bosnia, with the support of Serbia, Montenegro, and Russia. This resulted in a war of liberation by the Serbs under Ottoman rule, which was eventually supported by the de facto independent states of Serbia, Romania, and Greece. The Serbian government also sought to establish itself as a powerful force in the Balkans, posing a threat to Austria-Hungary's influence in the region.
On the other hand, Austria-Hungary had its own ambitions in the Balkans, which included expanding its territory and turning southern Slav nationalism into a pro-Austrian movement. They aimed to present themselves as a stabilising force in the region, offering 'development aid' to their Ottoman partners while secretly preparing for a possible invasion. Austrian diplomats believed that a war with Serbia was inevitable, especially after the Bosnian Crisis of 1908-1909, during which Austria-Hungary annexed Bosnia, inflaming pan-Serb sentiment.
The assassination of Archduke Franz Ferdinand of Austria and his wife by a Serbian nationalist in Sarajevo on June 28, 1914, provided the spark that ignited the conflict between the two nations. Austria-Hungary, with the support of Germany, used this event as a pretext to confront Serbia, which they saw as a threat to their ambitions in the Balkans. They presented Serbia with an ultimatum, demanding, among other things, the suppression of anti-Austrian propaganda and the right to conduct their own investigation into the assassination.
Serbia agreed to all of Austria's demands except for one, which entailed constitutional changes in the Serbian government. In response, Austria-Hungary broke diplomatic relations and prepared for a military invasion. Serbia's powerful supporter, Russia, began its own military mobilisation, which ultimately escalated the conflict into World War I.
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The role of Germany in the conflict
In the aftermath of the assassination of Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne, on June 28, 1914, Austria-Hungary sought to inflict a military blow on Serbia. They believed that Serbia was a threat to the stability of its multi-ethnic empire and wanted to demonstrate its strength while dampening Serbian support for Yugoslav nationalism. However, Austria-Hungary was wary of Russia's potential reaction, as they were a major supporter of Serbia.
Germany assured Austria-Hungary of its support, providing a "blank cheque" and encouraging quick action to localize the war and avoid direct conflict with Russia. This assurance gave Austria-Hungary the confidence to present Serbia with a harsh ultimatum on July 23, 1914, which included demands such as suppressing anti-Austrian propaganda and allowing Austria-Hungary to conduct its investigation into the archduke's assassination. Germany was involved in drafting this ultimatum, which was intentionally rigid, anticipating that Serbia would reject it and provide a pretext for war.
The German government opposed international efforts to moderate the conflict and advised Austria-Hungary to proceed with its plans. Germany's foreign policy was driven by its ambitions, perception of isolation, and fear of 'encirclement' by opposing powers. Additionally, Germany wanted to maintain its influence in the region and protect its interests.
On July 28, 1914, after pressure from Germany for swift action, Austria-Hungary declared war on Serbia, marking the beginning of World War I. Germany's subsequent declaration of war on Russia and France, as well as its violation of Belgian neutrality, further escalated the conflict into a global war.
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Frequently asked questions
Austria-Hungary declared war on Serbia on July 28, 1914, marking the start of World War I. This was in response to the assassination of Archduke Franz Ferdinand and his wife by a Serbian nationalist in Sarajevo a month prior. Austria-Hungary, with the support of Germany, demanded an ultimatum from Serbia, asking for all anti-Austrian propaganda within Serbia to be suppressed and for Austria-Hungary to be allowed to investigate the archduke's killing. Serbia accepted all demands except one, which led to Austria-Hungary breaking diplomatic ties and declaring war.
The declaration of war by Austria-Hungary sparked a chain reaction that escalated the conflict into World War I. Russia, Serbia's ally, began military mobilization against Austria-Hungary, leading to Germany declaring war on Russia. France, Russia's ally, also mobilized, resulting in France and Germany declaring war on each other. The German army's planned invasion of neutral Belgium then drew Britain into the war.
There were several underlying factors that contributed to the tensions between Austria-Hungary and Serbia. One factor was the suppression of Serbian revolts by Hungary during the 1848 Revolutions, which angered Serbian nationalists. Additionally, the economic conflict known as the Pig War (1906-1909) and the diplomatic crisis over the Austrian annexation of Bosnia inflamed pan-Serb sentiment. Austrian diplomats had also been convinced that war with Serbia was inevitable due to the growing influence of Slav nationalism in the region.

























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