
The Ottoman-Habsburg wars were a series of conflicts between the Ottoman Empire and the Austrian Habsburgs that spanned from the 16th to the 18th centuries. The first siege of Vienna in 1529 by the Ottomans marked the beginning of 150 years of military tension between the two powers. The Ottoman army, led by Suleiman the Magnificent, attacked the city with over 100,000 men, while the defenders, led by Niklas Graf Salm, numbered no more than 21,000. Despite the odds, Vienna survived the siege, which lasted just over two weeks, from 27 September to 15 October 1529. This initial defeat of the Ottomans in Vienna marked a turning point in the Ottoman-Habsburg wars, as the Austrian Habsburgs gradually began to gain the upper hand. The second siege of Vienna in 1683 resulted in a decisive victory for the Habsburgs and their allies, marking the beginning of the end of Ottoman domination in eastern Europe.
| Characteristics | Values |
|---|---|
| Year of the siege | 1529 |
| Month of the siege | September |
| Day the siege began | 27 September |
| Day the siege ended | 15 October |
| Duration of the siege | Just over two weeks |
| Number of attackers | Over 100,000 |
| Number of defenders | No more than 21,000 |
| Leader of the defenders | Niklas Graf Salm |
| Leader of the attackers | Sultan Suleiman the Magnificent |
| Outcome | Vienna survived the siege |
| Resulting tension | 150 years of bitter military tension between the Habsburgs and Ottomans |
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What You'll Learn

The first siege of Vienna in 1529
The first siege of Vienna by the Ottoman Empire took place in 1529. It was the first attempt by the Ottomans to capture the city, which was then the capital of the Archduchy of Austria, part of the Holy Roman Empire. The siege was led by Suleiman the Magnificent, sultan of the Ottomans, who sought to secure John Zápolya's position as ruler of Hungary.
Suleiman's army of over 100,000 men vastly outnumbered the Austrian force of no more than 21,000 defenders, led by Niklas Graf Salm. The siege lasted just over two weeks, from 27 September to 15 October 1529. During the siege, Ottoman attempts to mine the walls were hampered by a counterattack, and heavy rainfall in October dampened their gunpowder. The Austrian defenders successfully repulsed attack after attack, killing some 1,200 janissaries in a single engagement on 12 October.
The failure of the siege of Vienna marked the end of Turkish expansion into Europe and the beginning of 150 years of bitter military tension between the Habsburgs and Ottomans. It forced Suleiman to retreat to Ottoman Hungary and abandon his thoughts of conquering Europe. The siege also contributed to the coronation of Charles V as Holy Roman Emperor in 1530.
Following the defeat at Vienna, Suleiman's forces were harassed by skirmishing Christian cavalry all the way back to Istanbul. Despite the victory, there was tension among the various commanders and their armies, with disputes over the distribution of the spoils of the Ottoman camp.
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The second siege of Vienna in 1683
The Ottoman Empire had long sought to capture Vienna due to its strategic control over the Danube and trade routes to Germany and the Eastern Mediterranean. In 1529, Sultan Suleiman I made the first attempt to seize the city, but the Viennese defence, supported by European mercenaries, successfully repelled the attack. This initial failure fuelled 150 years of military tension, leading up to the decisive second siege in 1683.
In the years preceding the 1683 siege, the Ottoman Empire under Grand Vizier Kara Mustafa Pasha made extensive logistical preparations, including improving roads and bridges and forwarding ammunition and cannons to strategic locations. The Ottoman army, numbering approximately 90,000 to 150,000 troops, laid siege to Vienna, capturing the outer fortifications and tunnelling towards the inner walls. The Holy Roman Emperor Leopold I fled the city, seeking aid from Louis XIV of France and eventually forming an alliance with Poland and Venice.
The combined forces of the Holy Roman Empire and the Polish-Lithuanian Commonwealth, led by King John III Sobieski of Poland, marched to relieve Vienna. The Viennese garrison, led by Ernst Rüdiger Graf von Starhemberg, played a crucial role in defending the city until the relief forces arrived. The battle ended in a decisive victory for the combined forces, forcing the Ottomans to abandon the siege and marking a turning point in the Ottoman Empire's influence in Europe.
Following the 1683 siege, the Habsburgs assembled a coalition of European powers known as the Holy League to counter the Ottoman threat and regain control over Hungary. The Great Turkish War ensued, ending with a decisive victory for the Holy League at Zenta. The conflict between the Austrian Habsburgs and the Ottoman Empire continued intermittently throughout the 18th and 19th centuries, but they ultimately found themselves allied during World War I, after which both empires were dissolved.
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The Habsburgs' gradual conquest of southern Hungary and Transylvania
16th Century
The 16th century set the stage for the Habsburgs' expansion into southern Hungary and Transylvania, which were then part of the Kingdom of Hungary. The Ottoman conquests in Europe, including the decisive victory at the Battle of Mohács in 1526, resulted in the death of Louis II, King of Hungary, and left central Hungary under Ottoman control. This battle paved the way for the Ottomans to gain a foothold in southeastern Hungary.
Rival Factions and Ottoman Influence
Following King Louis II's death, rival factions within Hungary selected two successors: Archduke Ferdinand I of Austria, backed by the House of Habsburg, and John Zápolya, who sought aid from the Ottoman Empire. Zápolya was recognized as king by Sultan Suleiman in exchange for accepting vassal status within the empire. This marked the beginning of Ottoman influence in the region.
First Siege of Vienna (1529)
In 1529, the Ottomans, led by Suleiman the Magnificent, launched their first siege of Vienna, the Habsburg capital. Despite having over 100,000 men, the Ottomans were unable to capture the city, which was defended by a smaller but determined force led by Niklas Graf Salm. The failure of this siege marked the start of bitter military tension between the Habsburgs and Ottomans.
Habsburg-Ottoman Conflicts
The Habsburgs and Ottomans engaged in a series of conflicts known as the Ottoman-Habsburg Wars, which lasted from the 16th to the 18th centuries. These wars included the Long Ottoman-Habsburg War (1593-1606), marked by innovations in military tactics and technology, and the Great Turkish War, which ended with the Treaty of Karlowitz in 1699.
Expansion and Consolidation
During the 16th and 17th centuries, the Habsburgs gradually expanded their influence in southern Hungary and Transylvania. In 1530, after the defeat of the Ottomans in Vienna, Archduke Ferdinand recaptured Esztergom and other forts. In 1538, under the Treaty of Nagyvárad, the Habsburgs gained control of northern and western parts of Hungary (Royal Hungary), while John I secured the eastern part (Eastern Hungarian Kingdom).
Ottoman Control of Buda
A crucial event occurred in 1541 with the fall of Buda (Ofen) to the Turks. This led to the gradual expansion of Ottoman control over central Hungary, and their influence extended into northern Hungary, severing regular communications between Vienna and western Hungary with Transylvania.
Habsburg Military Bases in Transylvania
The Habsburgs established military bases in Transylvania, recognizing its strategic importance for launching offensives into the northern Balkans. This changed Transylvania's role in Hungarian affairs, and the Habsburgs preferred to keep it separate from the rest of Hungary.
The Long Ottoman-Habsburg War concluded in 1606 with a pro-Turkish vassal prince elected as the leader of Transylvania by Hungarian nobles. However, the war demonstrated the increasing reliance of the Ottoman army on firearms, challenging the notion of their technological inferiority.
The Great Turkish War and Treaty of Karlowitz (1699)
The Great Turkish War ended with a decisive Habsburg victory at the Battle of Zenta in 1697. The subsequent Treaty of Karlowitz in 1699 secured the rest of Hungary and overlordship of Transylvania for the Habsburgs. This marked a significant shift, with the Ottomans ceding nearly all of Ottoman Hungary.
Hungarian Resistance and Rebellions
Throughout the 17th and 18th centuries, there was resistance to Habsburg rule in Hungary and Transylvania. The Hungarian Diet voted to annul the Habsburgs' right to the throne, and rebellions such as Rákóczi's War of Independence and the Hungarian Revolution of 1848 reflected the ongoing struggle for independence.
In summary, the Habsburgs' gradual conquest of southern Hungary and Transylvania was a complex and prolonged process marked by military conflicts, political maneuvers, and shifting alliances. The outcome of this conquest shaped the region's political landscape for centuries to come.
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The Ottoman army's depletion
The Ottoman Empire's first attempt to capture Vienna, the capital of the Archduchy of Austria, took place in 1529. The siege of Vienna lasted just over two weeks, from 27 September to 15 October 1529. The Ottoman army, led by Suleiman the Magnificent, arrived in late September and had been depleted during its long advance into Austrian territory. The army was short of camels and heavy artillery, and many troops arrived in poor health. Of those fit to fight, a third were Sipahis, who were not well-suited for siege warfare.
The Ottoman forces laid siege to Vienna, capturing the outer fortifications and tunnelling towards the inner walls. However, the defenders, led by Niklas Graf Salm, disrupted the digging and successfully detonated several mines intended to breach the walls. The Ottoman army faced further setbacks when their heavy cannons, which were crucial for breaching the walls, got stuck in the mud due to heavy rainfall. The resistance of Pozsony also hampered their retreat, and early snowfall further impeded their movement.
The siege of Vienna in 1529 marked the beginning of 150 years of military tension between the Habsburgs and Ottomans, marked by reciprocal attacks. The failure of the siege demonstrated the increasing importance of firearms and military technology in the conflicts between the two empires. The Ottomans' increasing reliance on firearms, such as the adoption of volley fire, challenged the notion of their technological inferiority compared to their European counterparts.
The Ottoman-Habsburg conflicts culminated in a second siege of Vienna in 1683, which resulted in a decisive defeat for the Ottomans. A combined force led by John III Sobieski of Poland, along with Imperial troops and forces from various German states, lifted the siege and marked the beginning of the end of Ottoman domination in eastern Europe. The Habsburgs assembled a large coalition of European powers, known as the Holy League, to fight the Ottomans and regain control over Hungary. The Great Turkish War ended with significant Holy League victories at Vienna, Mohacs, and Zenta. The Austrian Habsburgs gradually conquered southern Hungary and Transylvania, clearing these regions of Ottoman forces. The balance of power shifted decisively away from the Ottomans, and they were unable to recover their previous dominance.
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The Habsburgs' dominance on land
The first siege of Vienna was a pivotal moment in the rivalry between the Ottoman Empire and the Habsburgs. The Ottoman army, led by Suleiman the Magnificent, arrived in late September 1529 with over 100,000 men. Despite the odds, the defenders of Vienna, numbering no more than 21,000, managed to hold off the Ottomans for just over two weeks, from 27 September to 15 October 1529. The siege was ultimately unsuccessful due to heavy rainfall, which hampered the Ottomans' use of heavy cannons and caused early snowfalls that slowed their retreat.
Following the siege of Vienna, a state of peace existed between the Holy Roman Empire and the Ottoman Empire for 20 years due to the Peace of Vasvár. However, tensions escalated again in the 1680s, leading to the second siege of Vienna in 1683. This time, the Ottoman army of approximately 90,000 to 150,000 men was defeated by a combined force led by John III Sobieski of Poland and the Holy Roman Emperor Leopold I. The relief army included Polish hussars, Imperial troops, and forces from Saxony, Bavaria, Baden, Franconia, and Swabia. The successful defence of Vienna marked the beginning of the end of Ottoman domination in eastern Europe.
After the second siege of Vienna, the Habsburgs assembled a large coalition of European powers known as the Holy League to fight the Ottomans and regain control over Hungary. The Habsburg army, along with units of Serbian Militia, captured several towns from the Ottoman Empire, including Belgrade in 1688. The Holy League, which also included the Venetian Republic, Poland, and Russia, scored decisive victories against the Ottomans at Mohacs in 1687, Slankamen in 1691, and Zenta in 1697.
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Frequently asked questions
The Austrian Habsburgs broke the Turkish siege of Vienna on 12 October 1529.
The siege of Vienna in 1529 was the first attempt by the Ottoman Empire, led by Suleiman the Magnificent, to capture the city. The defenders of Vienna, led by Niklas Graf Salm, numbered no more than 21,000, while the Ottoman army consisted of over 100,000 men. Despite the odds, Vienna was able to survive the siege, which lasted just over two weeks, from 27 September to 15 October 1529.
The failure of the siege of Vienna in 1529 marked the beginning of 150 years of military tension between the Habsburgs and Ottomans, marked by reciprocal attacks.
Yes, there was another notable siege of Vienna in 1683, which was the second siege of the city. This siege was led by Ottoman Sultan Mehmed IV and Grand Vizier Merzifonlu Kara Mustafa Pasha, and it lasted from July 17 to September 12, 1683. The Habsburg Holy Roman Emperor Leopold I, along with a combined force led by John III Sobieski of Poland, successfully defended the city, marking the beginning of the end of Ottoman domination in eastern Europe.



























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