
On 28 June 1914, Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne, and his wife were assassinated by a Serbian-backed terrorist in Sarajevo, Bosnia. This assassination led to a chain of events that culminated in Austria-Hungary issuing an ultimatum to Serbia on 23 July 1914. The ultimatum, delivered by Baron Giesl von Gieslingen, ambassador of the Austro-Hungarian Empire to Serbia, demanded that Serbia accept an Austro-Hungarian inquiry into the assassination and the participation of Austrian officials in investigations on Serbian territory. Serbia's response, delivered by Prime Minister Nicola Pasic, accepted most of the terms but rejected the participation of Austrian officials in the investigation, citing it as a violation of its constitution and criminal procedure law. This response led to Austria-Hungary breaking off diplomatic relations with Serbia and declaring war on 28 July 1914, marking the start of World War I.
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What You'll Learn
- Austria-Hungary's ultimatum to Serbia was delivered on July 23, 1914
- The ultimatum was issued nearly a month after the assassination of Archduke Franz Ferdinand by a Serbian nationalist
- Serbia was given 48 hours to accept an Austro-Hungarian inquiry into the assassination
- Serbia accepted all terms except one: the participation of Austrian officials in investigations on Serbian territory
- Austria-Hungary declared war on Serbia on July 28, 1914, starting World War I

Austria-Hungary's ultimatum to Serbia was delivered on July 23, 1914
On July 23, 1914, Austria-Hungary issued an ultimatum to Serbia, delivered by Baron Giesl von Gieslingen, ambassador of the Austro-Hungarian Empire to Serbia, to the Serbian foreign ministry. This ultimatum came nearly a month after the assassination of Austrian Archduke Franz Ferdinand and his wife by a young Serbian nationalist in Sarajevo, Bosnia. The Austro-Hungarian Empire, with the support of its allies in Berlin, pursued a hard-line policy towards Serbia, hoping to force a quick and decisive military conflict before other European powers, particularly Serbia's ally Russia, could react.
The ultimatum contained a lengthy list of demands, including that the Serbian government officially distance itself from the political campaign to unite the southern Slav peoples under Serbian leadership, which challenged Austria-Hungary's territorial integrity. Other demands included purging the Serbian army and civil service of anti-Austrian agitators and suppressing anti-Austrian propaganda in the Serbian press. Serbia was given 48 hours to respond, with a response demanded by 6 pm on July 25.
Serbia's response, delivered by Serbian Prime Minister Nicola Pasic, accepted most of the terms of the ultimatum but rejected the demand for Austrian participation in internal inquiries, citing it as a violation of the Constitution and the law of criminal procedure. This response appealed to international observers, but Vienna remained uninterested in a diplomatic solution, and Gieslingen broke off diplomatic relations, leading to Austria-Hungary declaring war on Serbia on July 28, 1914, marking the start of World War I.
The ultimatum and subsequent events highlighted the complex web of alliances in Europe at the time, with Germany supporting Austria-Hungary and Russia, France, and Britain becoming involved, leading to an outbreak of hostilities among major European states by early August 1914.
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The ultimatum was issued nearly a month after the assassination of Archduke Franz Ferdinand by a Serbian nationalist
On 23 July 1914, nearly a month after the assassination of Archduke Franz Ferdinand and his wife by a Serbian nationalist, Austria-Hungary issued an ultimatum to Serbia. The ultimatum was delivered to the Serbian foreign ministry by Baron Giesl von Gieslingen, the ambassador of the Austro-Hungarian Empire to Serbia. This ultimatum came as a result of Austria-Hungary's plan, developed in coordination with the German foreign office, to force a military conflict with Serbia. The plan was to end the conflict quickly and decisively before other European powers, particularly Serbia's ally Russia, could react.
The ultimatum included a lengthy list of demands made upon the Serbian government, assuming Serbian government involvement in the events at Sarajevo. Serbia was given 48 hours to respond to the ultimatum, with the demands designed to be as unacceptable as possible. The demands included requiring Serbia to officially distance itself from the political campaign to unite the southern Slav peoples under Serbian leadership, which challenged Austria-Hungary's territorial integrity. Additionally, Serbia was demanded to purge its army and civil service of anti-Austrian agitators and suppress anti-Austrian propaganda in its press.
Serbia's response to the ultimatum, delivered by Serbian Prime Minister Nicola Pasic, accepted most of the terms but rejected the demand for Austrian participation in internal inquiries, citing violations of its Constitution and the law of criminal procedure. Despite Serbia's efforts to appease Austria-Hungary, Vienna remained uninterested in a diplomatic solution. As a result, Gieslingen severed diplomatic relations, and on 28 July 1914, Austria-Hungary declared war on Serbia, marking the beginning of the First World War.
The complex web of alliances and miscalculations of European leaders led to an outbreak of hostilities among most major European states by early August 1914. Germany, having pledged its unconditional support to Austria-Hungary, worked diplomatically to contain the effects of the ultimatum. However, the mobilisation of Russia, Serbia's ally, and the subsequent reactions of France and Britain escalated the conflict beyond local hostilities.
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Serbia was given 48 hours to accept an Austro-Hungarian inquiry into the assassination
On July 23, 1914, nearly a month after the assassination of Archduke Franz Ferdinand of Austria and his wife by a young Serbian nationalist in Sarajevo, Bosnia, Austria-Hungary delivered an ultimatum to the Serbian foreign ministry. The ultimatum was presented by Baron Giesl von Gieslingen, ambassador of the Austro-Hungarian Empire to Serbia, at six o'clock in the evening. Serbia was given 48 hours, until 6 p.m. on July 25, to respond to the ultimatum, which included a list of demands made upon the Serbian government.
The primary issue was Serbia's alleged involvement in the assassination of Franz Ferdinand. Austria-Hungary demanded that Serbian officials collaborate with Austro-Hungarian representatives in the investigation of the assassination and the prosecution of the ringleaders on Serbian territory. This demand infringed upon Serbia's state sovereignty and was a violation of its constitution and criminal procedure laws. Nonetheless, Serbia's response, delivered by Prime Minister Nicola Pasic just before the deadline, accepted all terms of the ultimatum except for the participation of Austrian officials in internal inquiries.
Austria-Hungary's ultimatum to Serbia was part of a broader strategy to pursue a hard-line policy towards Serbia and force a military conflict. Vienna hoped for a quick and decisive Austrian victory before Serbia's powerful ally, Russia, had time to react. The ultimatum also aimed to suppress Serbian support for Yugoslav nationalism, which was seen as a threat to the unity of the Austro-Hungarian Empire. Additionally, the ultimatum included demands for Serbia to suppress anti-Austrian propaganda, purge anti-Austrian agitators from its government and military, and distance itself from efforts to unite the southern Slav peoples under Serbian leadership.
While Serbia's response to the ultimatum was largely accepting of the demands, Austria-Hungary was not interested in a diplomatic solution. The Austro-Hungarian ambassador broke off diplomatic relations with Serbia, and on July 28, 1914, Austria-Hungary declared war on Serbia, marking the beginning of World War I. The complex web of alliances and miscalculations of political and military leaders led to an outbreak of hostilities among most of the major European states by early August 1914.
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Serbia accepted all terms except one: the participation of Austrian officials in investigations on Serbian territory
On the evening of July 23, 1914, nearly a month after the assassination of Austrian Archduke Franz Ferdinand and his wife by a young Serbian nationalist in Sarajevo, Bosnia, Austria-Hungary issued an ultimatum to Serbia. This ultimatum was delivered by Baron Giesl von Gieslingen, the ambassador of the Austro-Hungarian Empire to Serbia, to the Serbian foreign ministry. The ultimatum was formulated with six points and demanded an answer from Serbia within 48 hours, by July 25 at 6 pm.
The six points of the ultimatum included:
- The Serbian government was to officially distance itself from the political campaign to unite the southern Slav peoples under Serbian leadership, which challenged Austria-Hungary's territorial integrity.
- The Serbian army and civil service were to be purged of anti-Austrian agitators.
- Anti-Austrian propaganda in the Serbian press was to be suppressed.
- Publications inciting hatred and contempt for the Austro-Hungarian Monarchy were to be eliminated from public instruction in Serbia.
- All officers and functionaries guilty of propaganda against the Austro-Hungarian Monarchy were to be removed from military service and administration.
- Austrian officials were to participate in the investigation and prosecution of the ringleaders of the assassination on Serbian territory.
Serbia's response to the ultimatum, delivered just before the deadline, accepted all terms except the sixth point regarding the participation of Austrian officials in investigations on Serbian territory. Serbian Prime Minister Nicola Pasic stated that this would violate the Constitution and the law of criminal procedure. This response from Serbia appealed to international observers, but it did little to satisfy Vienna. As a result, Baron Giesl von Gieslingen broke off diplomatic relations between the Austro-Hungarian Empire and Serbia and left Belgrade. On July 28, 1914, Austria-Hungary declared war on Serbia, marking the beginning of World War I.
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Austria-Hungary declared war on Serbia on July 28, 1914, starting World War I
On July 28, 1914, Austria-Hungary declared war on Serbia, starting World War I. This declaration came just a few days after Serbia received an ultimatum from Austria-Hungary, delivered on July 23, 1914, at 6 pm. The ultimatum came nearly a month after the assassination of Austrian Archduke Franz Ferdinand and his wife by a young Serbian nationalist in Sarajevo, Bosnia.
The ultimatum, presented to the Serbian foreign ministry by Baron Giesl von Gieslingen, Austria-Hungary's ambassador to Serbia, contained a list of demands aimed at preventing an escalation of tensions. However, the terms were designed to be as unacceptable as possible, with Vienna hoping to force a quick and decisive military conflict before other European powers, particularly Serbia's ally Russia, could react.
The demands included requiring Serbia to distance itself from the political campaign to unite the southern Slav peoples under Serbian leadership, which challenged Austria-Hungary's territorial integrity. Serbia's army and civil service were to be purged of anti-Austrian agitators, and anti-Austrian propaganda in the Serbian press was to be suppressed. Additionally, Austrian officials were to participate in the investigation and prosecution of the ringleaders on Serbian territory, which Serbia saw as a violation of its sovereignty.
Serbia's response, delivered by Prime Minister Nicola Pasic just before the deadline, accepted most of the terms but rejected Austrian involvement in internal inquiries. This response, while surprising to some, did little to appease Vienna, and Austria-Hungary broke off diplomatic relations with Serbia. With the complex web of alliances in Europe at the time, this escalation quickly led to the outbreak of World War I, as expected alliances were formed, and Europe descended into a conflict that would shape the course of history.
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Frequently asked questions
The ultimatum was issued after the assassination of Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne, and his wife by a Serbian-backed terrorist on June 28, 1914. Austria-Hungary, with encouragement and support from its ally Germany, sought to punish Serbia and quell support for Serbian nationalism.
The ultimatum demanded that Serbia accept an Austro-Hungarian inquiry into the assassination, which included the participation of Austrian officials on Serbian territory, infringing on Serbia's sovereignty. Serbia was given 48 hours to respond.
Serbia accepted most of the demands but rejected the participation of Austrian officials in investigations on its territory, citing it as a violation of its constitution and criminal procedure law. This response led to the breaking off of diplomatic relations between Austria-Hungary and Serbia, and ultimately, Austria-Hungary's declaration of war on Serbia on July 28, 1914, marking the start of World War I.














