
On June 28, 1914, Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne, and his wife were assassinated by a Serbian nationalist. This assassination caused the outbreak of World War I. On July 28, 1914, one month after the assassination, Austria-Hungary declared war on Serbia, effectively beginning World War I. Threatened by Serbian ambition in the tumultuous Balkans region of Europe, Austria-Hungary, with German encouragement, determined that the proper response to the assassinations was to prepare for a possible military invasion of Serbia.
| Characteristics | Values |
|---|---|
| Date of Austria-Hungary's declaration of war on Serbia | 28 July 1914 |
| Reason for declaration of war | Assassination of Archduke Franz Ferdinand and his wife by a Serbian nationalist |
| Support for Austria-Hungary | Germany |
| Support for Serbia | Russia, France |
| Austria-Hungary's demands to Serbia | Suppression of anti-Austrian propaganda, allowing Austria-Hungary to investigate the archduke's killing |
| Serbia's response to demands | Serbia accepted all demands except one |
| Result | Start of World War I |
| Austria-Hungary's military strength | 48 infantry divisions, 11 cavalry divisions, 7.8 million soldiers |
| Austria-Hungary's contribution to central powers | Manpower and food |
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What You'll Learn

Austria-Hungary declared war on Serbia
On June 28, 1914, Archduke Franz Ferdinand, the heir presumptive to the throne of the Austro-Hungarian Empire, and his wife, Sophie, Duchess of Hohenberg, were assassinated in Sarajevo by Gavrilo Princip, a Bosnian Serb and Serbian-backed nationalist. This event followed several years of rising tensions between Austria-Hungary and Serbia, exacerbated by the former's annexation of Bosnia-Herzegovina in 1908.
The complex web of alliances and rivalries among European powers further escalated the conflict. Russia, a supporter of Serbia, began military mobilisation against Austria-Hungary. This prompted Germany, a powerful ally of Austria-Hungary, to declare war on Russia on August 1, 1914. In turn, Russia's ally, France, ordered its own mobilisation, leading to war declarations between France and Germany on August 3. The German army's planned invasion of neutral Belgium brought Britain into the war on August 4, as they sought to protect their interests and balance power in Europe.
Thus, the declaration of war by Austria-Hungary on Serbia ignited a chain reaction of alliances and hostilities, ultimately leading to the outbreak of World War I, demonstrating the interconnectedness and volatility of European relations at the time.
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Russia's support of Serbia brought France into the conflict
On June 28, 1914, Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne, and his wife were assassinated by a Serbian nationalist in Sarajevo. This assassination was in response to Austria-Hungary's annexation of the predominantly Slavic province of Bosnia and Herzegovina in 1908. One month later, on July 28, Austria-Hungary declared war on Serbia. Threatened by Serbian ambition in the tumultuous Balkans region of Europe, Austria-Hungary, with German encouragement, presented Serbia with a rigid 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.
On July 30, 1914, Tsar Nicholas II ordered the mobilization of Russian forces to deter Austria-Hungary from invading Serbia. Russia issued an ultimatum to Vienna, warning Austria-Hungary against attacking Serbia. As the conflict escalated, Russia commenced mobilizing its reserve army along the border of Austria-Hungary. In response, Germany demanded that Russia demobilize, and when Russia did not comply, Germany declared war on Russia on August 1, 1914. According to its war plan, Germany prioritized its offensive against France, declaring war on August 3, 1914. Germany's violation of Belgian neutrality and British fears of German domination in Europe then brought Britain and its empire into the war on August 4, 1914.
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Germany's violation of Belgian neutrality brought Britain into the war
The assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife on June 28, 1914, was the catalyst for World War I. Austria-Hungary, with German encouragement, declared war on Serbia on July 28, 1914, marking the beginning of the conflict. This declaration of war set off a chain reaction, with Russia supporting Serbia, leading Germany to declare war on Russia, and France joining the conflict on Russia's side. While these events escalated tensions, Britain remained hesitant to enter the war. However, Germany's violation of Belgian neutrality became the tipping point that brought Britain and its empire into the war.
Germany's war plans included a swift invasion of France before turning their attention to Russia. To achieve this, they needed to pass through Belgian territory, violating Belgium's neutrality, which had been guaranteed by major European powers, including Britain, in a treaty signed in 1839. On August 2, 1914, Germany demanded free passage through Belgium, and their troops entered Belgian territory on August 4. This violation of Belgian neutrality was a key aspect of the Schlieffen Plan, Germany's strategy for war with France and Russia.
Britain had guaranteed to uphold Belgian neutrality and felt compelled to honour this commitment. Additionally, Britain feared German domination in Europe and viewed Germany's violation as an aggressive move that threatened Britain's security and position in the world. On August 4, 1914, Britain issued an ultimatum to Germany, demanding the withdrawal of its troops from Belgium. With no response from Germany, Britain declared war, joining the global conflict.
Germany's violation of Belgian neutrality had significant consequences. It transformed the conflict into a worldwide war with Britain's involvement. It also exposed the brutal nature of the German army, with the killing of Belgian civilians and the destruction of cultural landmarks, which outraged neutral nations like the United States. The violation of Belgian neutrality was a critical factor in shaping the course of World War I and the eventual outcome.
In summary, Germany's violation of Belgian neutrality was a pivotal moment in World War I. It brought Britain and its empire into the war, expanded the conflict globally, and highlighted the aggressive nature of German military actions. This event underscores the complex interplay of alliances, treaties, and power dynamics that characterised the lead-up to World War I.
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Austria-Hungary's ultimatum to Serbia
The assassination of Archduke Franz Ferdinand of Austria-Hungary and his wife on 28 June 1914 was the catalyst for Austria-Hungary's ultimatum to Serbia. The assassin was a Serbian-backed terrorist, which led Austrian authorities to blame Serbia for the killings. Austria-Hungary sought to inflict a military blow on Serbia and demonstrate its strength while also curbing Serbian support for Yugoslav nationalism, which threatened the unity of its multi-national empire.
Austria-Hungary, with the support of Germany, delivered an ultimatum to Serbia on 23 July 1914, demanding an immediate response. The ultimatum included the following terms:
- Prevent the spread of information that speaks negatively of Austria-Hungary or its Emperor.
- Dissolve Serbian nationalist organisations.
- Allow Austro-Hungarian representatives to enter Serbia and investigate the assassination of Franz Ferdinand.
- Remove and arrest individuals in the Serbian government deemed responsible for anti-Austria actions.
- Suppress publications inciting hatred and contempt for the Austro-Hungarian Monarchy.
- Eliminate teachings in Serbian public instruction that serve to foment propaganda against Austria-Hungary.
- Remove from military service and administration all officers involved in propaganda against the Austro-Hungarian Monarchy.
- Collaborate with Austro-Hungarian representatives to suppress the subversive movement against the Monarchy.
Serbia was insulted by the ultimatum, particularly the demand for Austro-Hungarian representatives to enter Serbia and investigate the assassination, as it viewed itself as a sovereign nation. Serbia sought assistance from Russia, which began its mobilisation in support of Serbia. Serbia did not respond to the ultimatum, and on 28 July 1914, Austria-Hungary declared war on Serbia, officially starting World War I.
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Assassination of Archduke Franz Ferdinand
The assassination of Archduke Franz Ferdinand and his wife, Sophie, on June 28, 1914, is considered the most immediate cause of World War I. The Archduke, heir to the Austro-Hungarian throne, and his wife were shot by a Serbian nationalist named Gavrilo Princip, a member of Young Bosnia, a secret revolutionary society. The assassination took place in Sarajevo, the capital of the Austro-Hungarian province of Bosnia and Herzegovina, during the Archduke's visit to the city.
Earlier in the day, the royal couple had escaped an assassination attempt when Nedeljko Cabrinovic, another Young Bosnia conspirator, threw a grenade at their car. The bomb detonated behind them, injuring people in the following car. Despite this, the Archduke decided to continue with his planned events, including a visit to the wounded officers in the hospital.
The assassination of Archduke Franz Ferdinand ignited tensions between Austria-Hungary and Serbia, which ultimately led to the outbreak of World War I. Austria-Hungary, with German encouragement, presented Serbia with an ultimatum, demanding, among other things, that it suppress anti-Austrian propaganda and allow Austria-Hungary to conduct an investigation into the archduke's killing. Although Serbia accepted most of the demands, Austria-Hungary broke diplomatic relations and declared war on Serbia on July 28, 1914, triggering a series of events that eventually led to the Great War.
The assassination of Archduke Franz Ferdinand was not an isolated incident but a result of growing nationalism, militarism, and imperial rivalry in Europe. Austria-Hungary's annexation of Bosnia and Herzegovina a few years prior to the assassination had already created tensions with Serbia, which also coveted these provinces. The assassination provided the spark that ignited the flames of war, as Europe descended into chaos, with nations declaring war on each other and forming alliances that divided the continent.
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Frequently asked questions
The assassination of Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne, and his wife on 28 June 1914 by a Serbian nationalist.
Austria-Hungary, with German encouragement, presented Serbia with an ultimatum after the assassination of the Archduke. Serbia accepted all but one of the demands, which led to Austria-Hungary declaring war.
Russia supported Serbia in the conflict, which led to Germany declaring war on Russia. This brought France into the war on Russia's side, and the conflict soon spread across Europe.
The underlying causes of World War 1 were growing nationalism, increased militarism, imperial rivalry, and competition for power and influence among European nations.































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