
The conflict between Austria-Hungary and Russia during World War I was part of a complex web of alliances and hostilities that marked the global conflict. It began with Austria-Hungary's invasion of Serbia, a Russian ally, on July 28, 1914, which Russia interpreted as a plot to diminish its influence in the Balkans. This prompted Russia to mobilise its army along the border with Austria-Hungary and declare war on Germany, an ally of Austria-Hungary, on August 1, 1914. The conflict between these empires had far-reaching consequences, contributing to the collapse of both the Russian and Austro-Hungarian Empires and shaping the course of Europe in the 20th century.
| Characteristics | Values |
|---|---|
| Date of invasion | August 6, 1914 |
| Reason for invasion | Russia's support of Serbia |
| Invasion strategy | Advance into Russia alongside German forces |
| Outcome | Collapse of the Russian and Austro-Hungarian Empires |
| Conflict | World War I |
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What You'll Learn

Germany declares war on Russia, 1914
On 28 June 1914, the heir to the Austro-Hungarian throne, Archduke Franz Ferdinand, and his wife were assassinated by a Serbian-backed terrorist. This assassination sparked the July Crisis of 1914, which led to a series of political, diplomatic, and military decisions that turned a localised conflict in southeast Europe into a global war. Austria-Hungary, with German encouragement, declared war on Serbia on 28 July, which Russia came in to defend as Serbia was a fellow Slavic nation. Germany, in turn, declared war on Russia on 1 August 1914.
Germany's war plan was time-sensitive and based on defeating France before Russia could get its army fully mobilised. On 31 July, Germany sent an ultimatum to Russia demanding it demobilise, but the ultimatum expired without a reply. Germany's declaration of war on Russia was thus closely followed by its declaration of war on France on 3 August. Germany's invasion of Belgium to get to France violated Belgian neutrality, which had been guaranteed in a treaty signed by major European powers, including Britain, in 1839. This violation tipped the balance for Britain, which issued an ultimatum demanding Germany withdraw its troops on 4 August. When Germany failed to respond, Britain declared war.
The causes of World War I are complex and still debated today. However, the immediate origins of the war lay in the decisions taken by statesmen and generals during the July Crisis of 1914. In the years leading up to the war, Europe's leaders saw military strength as an essential part of power, and most European powers maintained mass armies through compulsory military service and embarked on large-scale arms programmes. By the summer of 1914, Germany had a war plan to knock France out of the war before turning on Russia. This plan was influenced by German fears of Russia's growing military power and the desire to inflict a diplomatic setback on Russia and France.
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Austria-Hungary invades Serbia, 1914
On June 28, 1914, Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife were assassinated in Sarajevo by a Serbian nationalist. Austria-Hungary blamed Serbia for the attack, and tensions between the two countries rose.
On July 23, 1914, Austria-Hungary presented Serbia with an ultimatum, demanding that all anti-Austrian propaganda within Serbia be suppressed and that Austria-Hungary be allowed to conduct its own investigation into the archduke's assassination. Serbia accepted all of Austria's demands except one, and on July 25, 1914, Austria-Hungary broke off diplomatic relations with Serbia.
On July 28, 1914, Austria-Hungary declared war on Serbia, beginning the Serbian Campaign and effectively starting World War I. The invasion of Serbia by Austria-Hungary was a major factor in the outbreak of the war, as it led to a chain reaction of alliances and hostilities that soon engulfed all of Europe. Russia, in defence of a fellow Slavic nation, backed the Serbs, and Germany declared war on Russia in response. Russia's allies, France and Britain, also became involved, and by August 1914, Europe's largest powers were primed for war.
The Serbian Campaign lasted from July 28, 1914, to November 3, 1918, and resulted in a Central Powers victory and the occupation of Serbia. The Serbian army suffered severe casualties during this conflict, with their troops decreasing from 420,000 to 100,000. Serbian civilians also bore the brunt of the war, with almost 800,000 civilians losing their lives. Serbia was one of the countries most devastated by World War I, losing 25% of its mobilized population.
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Russia mobilises its reserve army
On July 28, 1914, Austria-Hungary officially declared war on Serbia. This declaration was the culmination of a series of events that began with the assassination of Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne, and his wife on June 28, 1914. In response to this declaration of war, Russia, which was allied with Serbia, commenced mobilizing its reserve army along its border with Austria-Hungary. This mobilization was an attempt by Russia to protect Serbia from Austrian-Hungarian forces and was a significant contributing factor to the start of World War I.
Russia's mobilization of its reserve army was not without hesitation or reluctance. Czar Nicholas II, who had expanded the Russian army to over 500,000 men in 1913, was initially hesitant to engage in war with Germany, which was an ally of Austria-Hungary. Nicholas sought to limit Russia's mobilization to a confrontation with only Austria-Hungary. However, on July 30, 1914, Nicholas took the decisive step of confirming the order for a general mobilization, signaling Russia's commitment to defending Serbia.
The Russian mobilization faced challenges due to the country's inadequate industrial base and lack of contingency plans for partial mobilization. Additionally, Russia's mobilization efforts were hindered by deficiencies in munitions, particularly rifles and shells. These weaknesses were exploited by the Central Powers, who assembled over 2.5 million troops to confront the Russians. Despite Russia's numerical advantage, their forces were disorganized, leading to significant losses in the early stages of the conflict.
The mobilization and subsequent entry of Russia into World War I had far-reaching consequences. It prompted Germany to declare war on Russia on August 1, 1914, followed by declarations of war from other European powers, including France, Britain, and the Ottoman Empire. The involvement of these nations marked the escalation of the conflict into a global war, with battles occurring on multiple fronts and millions of lives lost.
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The Eastern Front, World War I
The Eastern Front of World War I was a theatre of combat that encompassed the frontier between Russia and Romania on one side, and Austria-Hungary, Bulgaria, the Ottoman Empire, and Germany on the other. It stretched from the Baltic Sea in the north to the Black Sea in the south, covering much of Eastern Europe and stretching deep into Central Europe. The Eastern Front was a "war of movement", with dynamic fighting that often involved flanking and encirclement. It was distinct from the static warfare of the Western Front, which was fought in Belgium and France.
The Eastern Front was opened with the Battle of Stallupönen, which quickly turned into a disastrous defeat for the Russians following the Battle of Tannenberg in August 1914. The Russians had initially launched offensives against Germany and Austria-Hungary, hoping for a rapid victory. However, the Russian army faced several challenges, including deficiencies in munitions, especially rifles and shells. In contrast, the German and Austro-Hungarian armies had to be interwoven to strengthen the latter's uncertain fabric.
In 1915, the Central Powers launched a large-scale offensive on the Eastern Front, aiming to hammer the Russians into powerlessness. Despite initial successes, the Russians persisted in their attacks, and by the end of March 1915, they had lost 150,000 men. In June 1916, Brusilov's offensive shattered the Austro-Hungarian lines, but the Russians were unable to take full advantage due to the positioning of their reserves in the north. By the end of summer, Brusilov's men had lost their momentum, and the Russians had suffered enormous losses.
The Eastern Front also witnessed the participation of women in combat roles. Russia formed all-woman combat units, known as the Women's Battalions, to boost morale among male soldiers. Notable women who fought on the Eastern Front include Ecaterina Teodoroiu, who is remembered as a national hero in Romania, and Elsie Inglis, who led a group of Scottish volunteer nurses in Romania.
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Archduke Franz Ferdinand's assassination
On 28 June 1914, Archduke Franz Ferdinand of Austria, the heir presumptive to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, were assassinated. The assassination is considered the most immediate cause of World War I.
The assassination took place in Sarajevo, the capital of the Austro-Hungarian province of Bosnia and Herzegovina. The Archduke and his wife were shot at close range by 19-year-old Gavrilo Princip, a Bosnian Serb student and member of a student revolutionary group that later became known as Young Bosnia. Princip was part of a group of six Bosnian assassins, including Muhamed Mehmedbašić, Vaso Čubrilović, Nedeljko Čabrinović, Cvjetko Popović, and Trifko Grabež, coordinated by Danilo Ilić. All but one were Bosnian Serbs, and the group was armed and organized by the Black Hand, a secret society dedicated to creating a Greater Serbia through "terrorist action". The political objective of the assassination was to free Bosnia and Herzegovina of Austria-Hungarian rule and establish a common South Slav ("Yugoslav") state.
Earlier in the day, the couple had been attacked by Nedeljko Čabrinović, another Young Bosnia conspirator, who threw a grenade at their car. The bomb detonated behind them, injuring the occupants in the following car. Despite this, the Archduke and his wife continued with their schedule and arrived at the Town Hall for a reception. The Archduke was clearly stressed, interrupting a prepared speech of welcome by the mayor to protest the earlier attack.
The assassination of Archduke Franz Ferdinand and his wife led to the July Crisis and precipitated Austria-Hungary's declaration of war against Serbia. This, in turn, triggered a series of events that eventually led to Austria-Hungary's allies and Serbia's allies declaring war on each other, starting World War I. Russia came to Serbia's defence, as they were both Slavic nations. When Germany then declared war on Russia, France joined the war on Russia's side. Thus, within a month of the assassination, the world was at war.
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Frequently asked questions
Austria-Hungary invaded Russia in 1915, as part of the First World War.
The invasion was part of a larger offensive by the Central Powers, which included Germany and had over 2.5 million troops. The aim was to prevent Russia from attacking Germany from the east.
The Austro-Hungarian and German forces faced a disorganized Russian force of 4 million soldiers. Despite this, the Central Powers made advancements into Russian territory and the Russians suffered enormous losses. However, the invasion did not ultimately prevent Russia from continuing its attacks on Germany.
By the end of World War I, both the Russian and Austro-Hungarian empires had collapsed.






















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