
The conflict between Serbia and Austria-Hungary over the Balkans was a significant factor in the outbreak of World War I. The hostility between the two countries can be traced back to the late 19th and early 20th centuries, with the weakening of the Ottoman Empire and the subsequent struggle for influence and control in the Balkans region. Serbia sought to establish itself as a powerful nation in the Balkans, which was met with resentment and fear by Austria-Hungary, leading to a series of conflicts and tensions that ultimately contributed to the outbreak of WWI.
| Characteristics | Values |
|---|---|
| Reason for conflict | Austria-Hungary's annexation of Bosnia and Herzegovina in 1908 |
| Austria-Hungary's desire to suppress Serbian nationalism | |
| Serbia's desire for independence and freedom from foreign control | |
| Competition for influence and territory in the Balkans | |
| Alliance systems: Austria-Hungary supported by Germany; Serbia supported by Russia | |
| Impact | World War I |
| Increased political instability in the Balkans | |
| Rise of nationalist movements | |
| Massacres and atrocities committed by the Austro-Hungarian army against Serbian civilians | |
| Guerilla warfare and counterattacks by the Serbian Army |
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What You'll Learn

Annexation of Bosnia and Herzegovina by Austria-Hungary
The annexation of Bosnia and Herzegovina by Austria-Hungary was a significant event in the lead-up to World War I, causing a crisis in international relations and contributing to the complex web of alliances and hostilities that would characterise the conflict.
The roots of this annexation can be traced back to the 1870s, when rebellions against Ottoman rule in the Balkans were met with violent repression from the Ottoman Empire. This prompted the Russian Tsar, Alexander II, to intervene, leading to the Budapest Conventions of 1877, in which Russia agreed to Austria-Hungary's control over Bosnia-Herzegovina in exchange for their neutrality in the impending war with the Ottomans. From 1878 onwards, Austria-Hungary administered the provinces, although legal ownership remained with the Ottoman Empire.
In the late 19th and early 20th centuries, various factors further complicated the situation. The Treaty of Berlin, which prohibited the passage of warships into or out of the Black Sea, bottled up a significant portion of the Russian Navy, making it useless during the Russo-Japanese War of 1904-1905. Additionally, the largely Slavic population of Bosnia and Herzegovina, as well as their fellow Slavs in nearby Serbia, had nationalist ambitions, further inflaming tensions in the region.
In 1907, Count Alois Aehrenthal, the Austro-Hungarian Foreign Minister, began formulating a plan to solidify Austria-Hungary's position towards Serbia through the annexation of Bosnia-Herzegovina. In 1908, when the Young Turks staged a revolution in Constantinople, establishing a constitutional government, Aehrenthal saw an opportunity to act before the new Turkish regime could regain control over Bosnia and Herzegovina. On October 5 or 6, 1908, Austria-Hungary announced its annexation of the provinces, sparking outrage from Serbia and pan-Slavic nationalists. This upset the fragile balance of power in the Balkans and damaged relations between Austria-Hungary and its neighbours, particularly Serbia, which demanded the cession of a portion of Bosnia and Herzegovina.
The crisis was eventually resolved in April 1909, with the Treaty of Berlin being amended to reflect the annexation, marking a diplomatic victory for Austria-Hungary. However, the conflict permanently damaged relations between Austria-Hungary and Serbia, pushing the latter closer to Russia, and contributing to the intricate network of alliances and hostilities that would define the upcoming World War I.
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Serbian nationalism and independence
The Balkan Wars also had a significant impact on Serbian expansion and the stability of Austro-Hungary. The Hapsburg Empire had already surrendered territory to Italy and Russia in the 1870s, and the developments in the Balkans hinted at further losses. This threatened the stability of the Austro-Hungarian Empire, and its generals began to take a harder line on Serbia. Despite their military lagging behind that of Germany, the Austro-Hungarian commanders were confident they could defeat Serbia.
The assassination of Archduke Franz Ferdinand in Sarajevo in 1914 by a member of Crna Ruka provided the Austro-Hungarian government with a pretext to crush Serbian nationalism, which it had long desired. The conflict between the two countries was further exacerbated by the results of the Second Balkan War, in which Serbia felt that their gains were thwarted by Austria-Hungary, leading to resentment and anger. Serbia's expansion was seen as a threat to the stability of Austro-Hungary, and the Austro-Hungarians feared and resented the growth of Serbian influence in the region.
The complex network of alliances between European countries, such as Russia supporting Serbia and Germany backing Austria, further escalated the tension and increased the likelihood of war. The conflict between Serbia and Austria-Hungary over the Balkans was thus a result of competing nationalist aspirations, territorial disputes, and the intricate web of international alliances that characterised the region in the early 20th century.
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Russian support for Serbia
Russia and Serbia have historically been close allies, with Russia supporting Serbia in its conflict with Austria-Hungary over the Balkans. In 1907, when Austria-Hungary annexed Bosnia and Herzegovina, Serbia turned to Russia for support, and in 1912, under Russian auspices, the Balkan League was formed, and a war against Turkey ensued. Russia's support for Serbia continued into the 21st century, with joint military activities and the establishment of a joint crisis centre in the Serbian city of Nis. Russia has also worked with local Serbian nationalist leaders to undermine reform and stability in Bosnia and Herzegovina, bringing the country close to war.
However, Russia's support for Serbia has been described as "flaky", as Russia supported Western sanctions against Serbia in the 1990s and did not provide military support during NATO's 1999 intervention. Russia also abandoned a NATO-led peacekeeping mission in Kosovo in 2003. Despite this, Serbia has been one of Russia's closest allies in Europe, and the two countries have participated in joint military activities. In recent years, Russia's invasion of Ukraine and its crimes against civilians have sparked concerns about a potential Russia-sanctioned incursion into the Western Balkans.
Serbia's relationship with Russia has been a source of tension with the European Union and NATO, as Serbia strives to integrate with the Western Balkan states. The establishment of a joint crisis centre in Nis and the opening of a branch of the Russian international news agency Sputnik in Belgrade have contributed to a fall in public support for European integration and a rise in support for closer ties with Russia. However, following Russia's invasion of Ukraine, Serbia's President Aleksandar Vucic made a strong statement in support of Ukraine, suggesting a potential shift in Serbia's allegiance.
The West has recognised the opportunity to normalise relations between Kosovo and Serbia and downsize Russia's influence in the Balkans. Information operations have been suggested as a means to remind Serbian nationalists that Russia's support for Serbia has been inconsistent and that Russia is increasingly isolated and diminished as an ally. The West aims to shift the public conversation in Serbia away from support for Russia and towards normalising relations with Kosovo, targeting far-right Serbian nationalists who believe Kosovo is the heart of the Serbian motherland.
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Austria-Hungary's fear of Serbian growth
The First Balkan War of 1912 resulted in Serbia gaining control of the Adriatic coastline and Albania, which angered Austria-Hungary as they wanted Serbia to give up these territories. As a result of the Treaty of London in 1913, Serbia lost control of the Adriatic coast, and Albania became an independent state. However, Serbia gained control of central and northern Macedonia, which Austria-Hungary saw as a threat to its dominance in the region.
The Second Balkan War further fuelled Serbian nationalism and the desire to free Serbia from foreign control, particularly that of Austria-Hungary. The Austro-Hungarian Empire had formally annexed Bosnia and Herzegovina in 1908, which roused nationalist movements in Serbia and led to the formation of groups like the Narodna Odbrana, Crna Ruka, and Mlada Bosna, all of which sought to drive out the Austro-Hungarians from the region. The assassination of Archduke Franz Ferdinand in Sarajevo in 1914 provided the Austro-Hungarian government with a pretext to crush these nationalist movements.
The growth of Serbian nationalism and the increasing influence of Russia, which supported Serbia, threatened the stability of the multi-ethnic Austro-Hungarian Empire. The Austro-Hungarian generals began talking tough about Serbia, confident that they could easily defeat the Serbs despite their weaker military strength compared to Germany. The conflict between the two nations eventually escalated into World War I, with Germany supporting Austria-Hungary and Russia backing Serbia.
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Balkan Wars and territorial gains
The Balkan Wars were two conflicts that occurred in the Balkan States in 1912 and 1913. These wars were fought between the Balkan League (Serbia, Montenegro, Bulgaria, and Greece) and the Ottoman Empire, which at the time still controlled much of the region. The First Balkan War ended with the signing of the London Peace Treaty in May 1913, which recognised the independence of Albania and the territorial gains of the Balkan League. The Second Balkan War was fought between the members of the Balkan League over the division of territories gained in the First Balkan War.
The Balkan Wars resulted in significant territorial gains for the Balkan League, which had been established under Russian auspices and through the statesmanship of M. Venizelos. Serbia, in particular, sought to expand its territory and access to the Adriatic, which was checked by Austria-Hungary. Serbia's aspirations for territorial expansion were backed by Russia, which further escalated the conflict. Bulgaria also sought to unite territories inhabited by its nationals, including parts of Northeast Macedonia and Southern Dobrudja.
Austria-Hungary's annexation of Bosnia and Herzegovina inflamed tensions with Serbia and led to the First Balkan War. The establishment of an independent Albania by Austria-Hungary further caused strife among the Balkan Allies, leading to the Second Balkan War. The Second Balkan War resulted in Serbia taking control of the so-called uncontested zone in Northeast Macedonia, which had been sought by Bulgaria.
The Balkan Wars had significant implications for the region, altering the balance of power and inflaming national hatreds. The territorial gains made by Serbia and other Balkan states weakened the position of Austria-Hungary and contributed to the complex web of alliances and rivalries that characterised the lead-up to World War I. The conflicts in the Balkans also highlighted the competing interests of major European powers, such as Austria, Russia, Germany, and France, which further escalated tensions and ultimately contributed to the outbreak of World War I.
The concept of territorial gains refers to the acquisition of ownership and control over a particular area of land or water. In the context of the Balkan Wars, territorial gains were a driving force behind the conflicts, as various nations sought to expand their influence and secure access to strategic regions. These territorial ambitions contributed to the complex dynamics of the region and had lasting impacts on the course of history.
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Frequently asked questions
Austria-Hungary's annexation of Bosnia and Herzegovina in 1908 angered Serbia as they wanted control of the region. This, along with Serbian expansion, threatened the stability of the Austro-Hungarian Empire and fuelled nationalist movements in Serbia.
Russia supported Serbia, Germany supported Austria-Hungary, France supported Russia, and England supported France. This fragile interlocking of alliances was a significant factor in the outbreak of World War I.
The conflict resulted in the First Balkan War in 1912, which ended with Serbia gaining control of central and northern Macedonia. However, Serbia blamed Austria-Hungary for their loss of land, and this further fuelled the hostility between the two nations. The Second Balkan War broke up the Balkan League, leaving Serbia weakened and exasperated, which made it an easy target for Austria-Hungary.
The conflict ended with the liberation of all of pre-war Serbia by the Royal Serbian Army, bringing an end to the three-year Central Powers occupation. The Austro-Hungarian invasion of Serbia was marked by countless massacres and atrocities against Serbian civilians.










































