
On July 28, 1914, Austria-Hungary declared war on Serbia, marking the beginning of World War I. This declaration came exactly one month after the assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, by Bosnian Serb nationalist Gavrilo Princip. The Austro-Hungarian leadership deemed Serbia responsible for the murder and aimed to quash its independence, viewing it as a threat to the empire due to its significant South Slavic population. In the lead-up to the war, Austria-Hungary presented Serbia with an ultimatum, demanding the suppression of anti-Austrian propaganda and the right to conduct an investigation into the archduke's killing. Despite Serbia accepting most of the demands, Austria-Hungary broke diplomatic relations and pursued military action, ultimately resulting in the occupation of Serbia until the end of World War I.
| Characteristics | Values |
|---|---|
| Date of Austria-Hungary's declaration of war on Serbia | 28 July 1914 |
| Date of Austria-Hungary's first invasion of Serbia | 12 August 1914 |
| Austria-Hungary's invasion force commander | Feldzeugmeister Oskar Potiorek |
| Number of soldiers amassed by Austria-Hungary on Serbian frontiers by 12 August 1914 | 500,000 |
| Number of operational troops out of the above | 380,000 |
| Number of Serbian inhabitants lost during the war | 1,200,000+ |
| Number of Serbian soldiers who lost their lives or were not returned from captivity | 177,000 (approximate) |
| Number of Serbian civilians who lost their lives | Hundreds of thousands |
| Number of Serbian captives in internment camps in Austria-Hungary | 150,000-200,000 |
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What You'll Learn

Austria-Hungary's declaration of war on Serbia
On June 28, 1914, Archduke Franz Ferdinand, the heir presumptive to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, were assassinated in Sarajevo by Gavrilo Princip, a Bosnian Serb nationalist and member of a Serbian-backed secret paramilitary organisation. This event, which followed several years of tensions between Austria-Hungary and Serbia, sparked a series of diplomatic and military escalations among the major powers of Europe, known as the July Crisis, which ultimately led to the outbreak of World War I.
Austria-Hungary immediately undertook a criminal investigation, and on July 6, based on interrogations of the accused assassins, telegraphed Serbia, asserting that a Serbian military party was involved in the assassination. On July 23, after securing the unconditional support of its powerful ally, Germany, Austria-Hungary presented Serbia with an ultimatum, 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.
Although Serbia accepted all of Austria's demands except for one—which would have resulted in a major infringement of its sovereignty—Austria-Hungary broke off diplomatic relations on July 25 and continued with military preparedness measures. On July 28, 1914, Austria-Hungary officially declared war on Serbia, marking the beginning of World War I. This declaration came just one month after the assassination of Archduke Franz Ferdinand and his wife.
The decision to declare war was influenced by a complex web of alliances and the miscalculations of political and military leaders. Austria-Hungary sought to demonstrate its strength, suppress Serbian support for Yugoslav nationalism, and protect the unity of its multinational empire. Germany, a key ally of Austria-Hungary, played a significant role in encouraging swift and decisive action against Serbia, believing that a localised war could be contained without drawing in other major powers. However, the outbreak of hostilities between Austria-Hungary and Serbia quickly escalated, leading to a wider European conflict as other nations became involved.
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The assassination of Archduke Franz Ferdinand
In the spring of 1914, the Black Hand decided to assassinate Archduke Franz Ferdinand, perceiving him as a threat to Serbian independence. They recruited, trained, and equipped three young Bosnians: Gavrilo Princip, Nedjelko Cabrinovic, and Trifko Grabez, who later added additional conspirators. Archduke Franz Ferdinand's visit to Sarajevo in June 1914 provided an opportunity for the assassins. On the day of the assassination, the Archduke and his wife were riding in an open carriage through the streets of Sarajevo, making them vulnerable to attack.
Earlier that day, Archduke Franz Ferdinand had narrowly escaped an assassination attempt when a bomb was thrown at their car. Despite the danger, the couple continued with their scheduled engagements, arriving at the Town Hall for a reception. Franz Ferdinand showed signs of stress, interrupting a prepared speech by the Mayor to protest the greeting he had received. After a few remarks from the Mayor, the Archduke calmed down and gave his speech, adding his own comments about the earlier assassination attempt. However, fate would catch up with them, and they would be shot by Gavrilo Princip, resulting in their deaths.
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The July Crisis
In response to the assassination, Austria-Hungary sought to inflict a military blow on Serbia, viewing Serbian support for Yugoslav nationalism as a threat to the unity of its multi-national empire. On July 23, Austria-Hungary, with the encouragement and unconditional support of Germany, delivered an ultimatum to Serbia, known as the July Ultimatum. This ultimatum consisted of ten demands, intentionally made unacceptable to provoke a war with Serbia. Serbia agreed to eight of the ten demands, but Austria-Hungary was not satisfied and broke off diplomatic relations.
On July 28, 1914, exactly one month after the assassination of Franz Ferdinand, Austria-Hungary declared war on Serbia, marking the beginning of World War I. The Austro-Hungarian Army, under the command of General Oskar Potiorek, launched the first invasion of Serbia, dubbed a "punitive expedition." Despite three unsuccessful invasion attempts, the Austro-Hungarians, with German and Bulgarian support, eventually breached the Serbian front in October 1915. By January 1916, all of Serbia had been occupied, and it remained under the control of the Central Powers until its liberation in September 1918.
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The occupation of Serbia
The Austro-Hungarian occupation of Serbia began in late 1915 and lasted until the end of World War I in 1918. The occupation was precipitated by the assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, by a Bosnian Serb student named Gavrilo Princip in Sarajevo on June 28, 1914. This assassination led to Austria-Hungary declaring war on Serbia on July 28, 1914, marking the start of World War I.
During the early stages of the war, Austria-Hungary launched three unsuccessful offensives against Serbia between August and December 1914. However, in October 1915, a combined Austro-Hungarian and German offensive, along with a Bulgarian attack from the east, breached the Serbian front. By January 1916, all of Serbia was occupied by the Central Powers. Serbia was then divided into two separate occupation zones: an Austro-Hungarian zone and a Bulgarian zone, each governed under a military administration. The Austro-Hungarian occupation zone covered the northern three-quarters of Serbia.
The occupation regime in Serbia was marked by repression and atrocities committed against the civilian population. The Austro-Hungarian Army imposed martial law, banned political organizations and public assembly, and brought schools under its control. They also engaged in hostage-taking, punitive raids, and responded to uprisings with public hangings and summary executions. Between 150,000 and 200,000 Serbian civilians, including men, women, and children, were deported to internment and concentration camps in Austria-Hungary, such as Mauthausen in Austria, Doboj in Bosnia, and Nagymegyer, Arad, and Kecskemét in Hungary. These civilians were denied access to Red Cross aid as they were not considered "enemy aliens" but "internal enemies". Additionally, the occupying forces implemented a de-nationalization policy, aiming to erase Serbian national identity.
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Serbian nationalism
The origins of Serbian nationalism can be traced back to the 1804 uprisings against Ottoman rule, which eventually led to the creation of an independent Serbian state in 1878. However, Serbian nationalists themselves cite the Battle of Kosovo in 1389 as the origin of the movement. After Serbia gained independence, both South Slavs and the Serbian government considered Serbs in Habsburg-ruled Austria-Hungary to be under occupation, resulting in increasing antagonism between Serbia and Austria-Hungary from the late 19th century to the early 20th century. This antagonism was a major factor in the breakdown of relations between the two nations, as Austria-Hungary included a sizeable Serb minority among its nationalities, and Serbs on both sides of the frontier regarded Habsburg rule as oppressive.
After World War I, Serbian nationalism continued to play a role in the establishment of the first Yugoslav state, which was unable to pacify internal conflicts and rigid national ideologies. During World War II, Serbian nationalism rose in response to the Axis occupation of Yugoslavia, with the Chetnik forces of Draža Mihailović adopting an extreme anti-Muslim variant of Serbian nationalism, massacring Bosnian Muslims. After World War II, Josip Broz Tito established a communist Yugoslavia that repressed nationalism of any culture deemed a threat to the state, leading to the suppression of Serbian nationalism. However, in the 1960s, Serbian intellectuals challenged state-sponsored policies of Yugoslavism and "Brotherhood and Unity", and the expulsion of nationalist-leaning Serbian communist official Aleksandar Ranković was perceived as an attack on Serbian nationalism.
In the 1980s, Serbian nationalism resurfaced as a backlash against the decentralization of the Socialist Federal Republic of Yugoslavia and the suppression of ethnic nationalist sentiments. Serbian nationalists demanded that all Serbs in the Yugoslav republics had the right to be united in a common state, leading to ethnic conflict with other Yugoslav ethnicities seeking independence. The rise of Serbian nationalism in the 1980s broke the fragile unity of Yugoslavia and contributed to its eventual disintegration.
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Frequently asked questions
Austria-Hungary declared war on Serbia on July 28, 1914.
The assassination of Archduke Franz Ferdinand and his wife, Sophie, Duchess of Hohenberg, on June 28, 1914, by a Serbian nationalist.
Archduke Franz Ferdinand was the heir presumptive to the Austro-Hungarian throne.
Austria-Hungary suspected Serbian backing for the assassination and saw it as an opportunity to crush the Serbian threat to the stability of its multi-ethnic empire.
The complex web of alliances and rivalries among the major powers of Europe, including Russia, Germany, France, and Britain, led to a series of diplomatic and military escalations that turned a localised conflict into World War I.







































