
The Austro-Hungarian Empire conscripted 7.8 million soldiers during World War I. The assassination of Archduke Franz Ferdinand and his wife by a Serbian nationalist in 1914 was the catalyst for Austria-Hungary's declaration of war on Serbia, which marked the beginning of World War I. Austria-Hungary's subsequent conflict with Russia, Serbia's ally, was a significant factor in the Eastern Front of the war. The Battle of Caporetto in 1917 was a major victory for Austria-Hungary, but the empire suffered heavy losses in its battles with Italy, and by the end of the war, it had collapsed, with its territories divided among several newly formed nations.
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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 throne of the Austro-Hungarian Empire, and his wife, Sophie, Duchess of Hohenberg, were assassinated in Sarajevo by Gavrilo Princip, a Bosnian Serb nationalist and member of a Serbian-backed paramilitary organisation. This assassination intensified the existing ethnic hostilities in Bosnia and led to the Anti-Serb riots of Sarajevo, during which Catholic Croats and Bosnian Muslims killed two people and damaged several Serb-owned buildings.
The assassination also sparked the July Crisis, a series of diplomatic and military escalations among the major powers of Europe that ultimately led to the outbreak of World War I. Austria-Hungary sought to suppress Serbia's nationalist movement and communicated a list of demands to the Serbian government. Serbia agreed to comply wholly or in part with most of the demands but rejected the final demand, which would have resulted in a significant infringement of its sovereignty. Russia had guaranteed support to Serbia against Austria-Hungary.
On July 28, 1914, Austria-Hungary officially declared war on Serbia, marking the start of World War I. The German Empire supported Austria-Hungary's declaration of war, believing that a swift war against Serbia would present a fait accompli to the world. Germany also wanted to avoid a conflict with Russia, which was not yet ready for war and had guaranteed support to Serbia. The German Emperor, Wilhelm II, declared his support for "settling accounts with Serbia" and assured the Austro-Hungarian government that Germany would support the monarchy "through thick and thin".
The Austro-Hungarian Empire conscripted 7.8 million soldiers during World War I. The outbreak of the war led to the mobilisation and concentration of new divisions, and the successful Russian advance was halted and slowly repelled, but the Austrian armies suffered heavy losses of about 1 million men and never recovered. The huge losses inflicted on the Russians contributed to the 1917 revolutions and caused an economic crash in the Russian Empire.
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The Battle of Caporetto
In the lead-up to the battle, the Italians had launched numerous offensives on the Austro-Hungarian lines in the Isonzo sector, with the 11th Battle of the Isonzo being particularly successful in pushing back the Austro-Hungarians. However, both sides were exhausted and running out of men. Emperor Karl requested that German forces be deployed to Italy, and in August 1917, it was decided to send troops from the Eastern Front to the Isonzo sector. The Germans also planned to use poison gas in the attack, with the quiet Caporetto sector being chosen as the target for the offensive due to the weakness of the Italian defence in that area.
On 24 October 1917, the Central Powers launched a massive offensive at Italy's northeastern border. The Austro-Hungarian forces, reinforced by German units, broke through the Italian front line and routed the opposing forces. The battle demonstrated the effectiveness of stormtroopers and infiltration tactics developed by Oskar von Hutier. The use of poison gas by the Germans played a key role in the collapse of the Italian Second Army.
The initial assault by the Central Powers was extremely successful, but as their controlled area expanded, their limited logistical capacity was strained. By the time the attack reached the Piave River, the Central Powers' soldiers were low on supplies and exhausted. Despite these challenges, the Central Powers were able to advance more than 100 kilometres (62 miles) towards Venice, but they were unable to cross the Piave River.
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The Italian Front
Italy entered the war on the Entente side, aiming to annex Austrian territories, including the Trentino region, South Tyrol, and northern Dalmatia. The Italians, led by Chief of Staff Luigi Cadorna, launched their offensive in May 1915, marching towards the Isonzo River and aiming to capture Ljubljana and threaten Vienna. However, their advance was soon halted due to flooding, and trench warfare ensued.
Cadorna embarked on a series of persistent offensives known as the Battles of the Isonzo, which resulted in heavy casualties for both sides. The Austrians, led by Chief of General Staff Franz Conrad von Hötzendorf, fiercely defended their positions, taking advantage of the higher ground and well-developed defensive systems. The rocky ground and karst rock in the Isonzo Valley posed additional challenges and dangers for the soldiers.
The Sixth Battle of the Isonzo in August 1916 resulted in a significant victory for the Italians, as they captured the town of Gorizia. However, the Italians sustained heavy casualties throughout the campaign, with 500,000 casualties in 1916 alone.
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The collapse of Austria-Hungary
Throughout the war, Austria-Hungary suffered heavy losses in both men and material. By September 1916, the Austrian armies had lost about 1 million men and never recovered. In May 1915, Italy attacked Austria-Hungary, and despite suffering from poor leadership and organization, they managed to inflict significant casualties on the Austro-Hungarians. The Battles of the Isonzo, which took place between Italy and Austria-Hungary, resulted in an estimated 520,000 casualties for the Austro-Hungarians. However, they achieved a decisive victory at the Twelfth Battle of the Isonzo (Battle of Caporetto) in November 1917, gaining control over new territories.
Despite this victory, the Austro-Hungarian Empire continued to face internal and external pressures. The duality of the Habsburg monarchy, with the Hungarian parliament in Budapest showing less amenability to military dictation than the Austrian, created governance challenges. Additionally, the Emperor Charles' grant of autonomy to the peoples of the Austrian Empire in October 1918 further facilitated the process of disruption within the monarchy. The Czechoslovaks in Prague and South Slavs in Zagreb had already started taking steps towards independence.
The final significant battle of World War I on the Italian Front, the Battle of Vittorio Veneto, began on October 24, 1918, and resulted in a decisive Italian victory. This battle, fought primarily between Italy and Austria-Hungary, marked the acceptance of defeat for Austria-Hungary in World War I. On November 3, 1918, the armistice between the Allies and Austria-Hungary was signed, coming into effect on November 4. As part of the armistice provisions, Austria-Hungary was required to evacuate occupied territories and expel or intern all German forces within 15 days.
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The Austro-Hungarian army
The Austro-Hungarian Armed Forces were one of the largest and most significant in Europe, and they played a crucial role in World War I. The history of the military dates back to the 13th century when the Habsburgs established hereditary rule over Austrian lands. Over the centuries, the Habsburg or Austrian forces were a formidable opponent to the Ottoman campaigns in Europe, successfully defending Vienna from siege on two occasions.
In the late 19th century, the army was used to suppress civil unrest in urban areas of the empire, including Vienna, Graz, Prague, and Trieste. This period also saw the occupation of Bosnia and Herzegovina in 1878, which intensified existing ethnic hostilities. In the years leading up to World War I, the Austro-Hungarian Military underwent modernisation in terms of training, equipment, and doctrine, although some traditions remained. The air force, however, was still in its early stages in 1914.
At the outbreak of World War I, the Austro-Hungarian army was divided, with a smaller part attacking Serbia and the larger part facing the Russian army. The invasion of Serbia in 1914 was a disaster, resulting in heavy losses and no territorial gains. The army also faced setbacks on the Eastern front, losing the Battle of Lemberg and the fort city of Przemysl. In 1915, Italy joined the Allies and attacked Austria-Hungary, leading to prolonged and bloody fighting on the Italian front. Despite these challenges, the Austro-Hungarian forces achieved some successes, such as the defence of the Isonzo River thanks to their superior artillery and terrain advantage.
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Frequently asked questions
World War 1 started after Archduke Franz Ferdinand of Austria and his wife were assassinated by a Serbian nationalist in Sarajevo. Austria-Hungary declared war on Serbia in response, and the conflict quickly escalated as other nations entered the war through a system of alliances.
Austria-Hungary fought against Serbia, Russia, Italy, and Czechoslovakia. They conscripted 7.8 million soldiers during the war and fought significant battles on multiple fronts, including the Serbian Campaign, the Eastern Front, and the Italian Front.
Austria-Hungary suffered heavy losses, both in terms of soldiers and territory. They were required to evacuate occupied territories and cede control of various regions to other countries. The Austro-Hungarian Empire collapsed, and the remaining territories were divided among Poland, Czechoslovakia, Yugoslavia, Italy, and Romania.
The war had different impacts on the Austrian and Hungarian governments. The Austrian parliament was suspended for three years, while the Hungarian parliament continued its sessions and maintained a degree of independence. Count Mihály Károlyi, chairman of the Budapest National Council, sought to dissociate Hungary from Austria.


















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