The Austro-turkish Wars: the End of the Ottoman Threat to Europe

1683. For more than two centuries, the Ottoman sultans dictated terms to the Christian world, striking terror into Western monarchies. The Siege of Vienna was the Ottoman Empire's final major attempt to break into Central Europe and the symbolic pinnacle of its expansion in the West, while at the same time marking the beginning of its prolonged decline. Within just a few decades, the sublime porte had lost a significant portion of its European possessions and its status as the undisputed leader. But what exactly was eating away at this colossus from within? What hidden processes set in motion the collapse of the seemingly invincible empire? The ground beneath Vienna shook. From the hills of Kahlenberg, cavalry poured into the valley. In one of the largest cavalry charges in history, 20,000 horsemen, led by the winged hussars of John III Sobieski, thundered straight toward the Grand Vizier's camp. The battle became a strategic turning point in the centuries-long confrontation between the Ottoman Empire and Christian Europe. Vienna could have become the Turks' gateway into the heart of the Holy Roman Empire. Yet Christian Europe united against their common enemy. Allied forces led by John III Sobieski broke the siege of Vienna. The Ottoman offensive was brought to a halt. Thus began the Great Turkish War. As early as the following year, 1684, the Holy League was formed at the initiative of the Pope, a large-scale anti-Ottoman coalition. The war spread across several fronts. While the Habsburgs were pushing the Turks back in central Europe, the Marian War erupted in the south. The Republic of Venice attacked Ottoman possessions on the Peloponnese Peninsula and in Dalmatia, stretching the Sultan's forces thin. The Austrian offensive became inevitable. In 1686, after a prolonged siege, Buda fell, the historic capital of Hungary, which had been under Ottoman rule for a century and a half. And already in 1687, the Habsburgs crushed the Ottoman army at Mohacs, taking symbolic revenge for the tragedy of 1526. The final blow in this campaign came with the brilliant Austrian victory at Zenta. Imagine it. An army divided by a river. A bridge blocked by cannons and wagons. And at this critical moment, enemy forces emerging from the fog. Sultan Mustafa II watched helplessly from the opposite bank of the Tisza as the army of Prince Eugene of Savoy methodically annihilated his elite units. That day, the river ran red with blood. The Ottomans lost up to 30,000 men, killed and wounded, including Grand Vizier Elmas Mehmed Pasha, while the Austrians suffered fewer than 500 fatalities. The war ended with the Treaty of Karlovitz and an unprecedented diplomatic catastrophe for the sublime port. For the first time in its history, the empire surrendered significant territories in Europe, permanently losing control over Hungary and Transylvania. Yet it was still too early to remove the Ottoman Empire from the chessboard of history. The new sultan, Ahmed III, fought corruption, replenished the treasury, and partially reformed the army according to the principles of a new era. Behind the facade of change lay a thirst for revenge. Istanbul directed its first strike against the weakest link in the Holy League, Venice. In 1714, the Second Marian War erupted, the final confrontation in the long struggle between Istanbul and Venice. The Ottoman fleet and land forces rapidly drove the Italians out of the Peloponnese. Venice lost everything it had gained during the Great Turkish War and found itself on the brink of collapse. Its salvation came only through Vienna's intervention. Realizing that the strengthening of the Ottomans would disrupt the balance of power, in 1716 the Habsburgs declared war on the Turks. This move became the prelude to one of the most successful Austrian campaigns in the history of the Ottoman-Habsburg Wars. The Austrian forces were led by a living legend of contemporary military affairs, the renowned Prince Eugene of Savoy, who was already awaiting a decisive battle at Petrovaradin in 1716. The Grand Vizier and the Sultan's son-in-law, Siladar Ali Pasha, was approaching the Danube at the head of a 120,000-strong Ottoman army. 40,000 elite janissaries, 30,000 sipahis, Crimean Tatar light cavalry, and Wallachian militia. The size of the Turkish army once again astonished with its scale. Ali Pasha had no doubts about success, relying on his numerical superiority. His target was Petrovaradin, a fortress known as the Gibraltar of the Danube, and the key to all of Hungary. If Petrovaradin fell, the road to Vienna would once again be open to the Turks. Prince Eugene of Savoy, who was defending the fortress, had around 70,000 soldiers. These were the combined Christian forces from the Habsburg domains. Austrians, Croats, Hungarians, and Serbs. 40,000 infantry, 20,000 cavalry, and auxiliary units. But Savoy had something the vizier did not, a brilliant tactical mind. The Ottomans approached the fortress and set up camp. They expected the Austrian commander to hide behind the walls and for a long, exhausting siege to begin. But Savoy broke all the conventional patterns. Instead of sitting back on the defensive, he drew up his army directly in front of the Turkish camp. For anyone else, finding oneself trapped between a river and an enemy twice as large would have been suicide. For Savoy, it was a calculated risk. He decided to strike first. The Austrian units advanced, and it was precisely then that nature intervened in the course of history. In the height of summer, the temperature suddenly dropped. A torrential downpour began, and a storm broke out. The anomalous weather disoriented the Ottomans, the gunpowder became damp, and their muskets increasingly misfired. The Austrian infantry launched an attack. A brutal hand-to-hand battle began. The Janissaries, the elite of the empire, counterattacked with savage fury and broke through the center of the Austrian line. But Savoy instantly assessed the changing situation on the battlefield. He had been waiting for this moment. The commander threw his heavy cuirassier cavalry into a counterattack, straight into the exposed flanks of the Ottomans, who had become too deeply committed to their offensive. The Austrian cavalry crushed the Turkish flanks. Grand Vizier Ali Pasha realized that victory was slipping from his grasp. He drew his saber and, accompanied by his personal guard, charged into battle, attempting to halt the panic, but was killed after being mortally wounded. Without Ali Pasha, the gigantic army of the Sublime Port turned into an uncontrollable mob, abandoning everything, cannons, tents, the treasury, and retreating in panic toward Belgrade. Prince Eugene of Savoy lost around 5,000 soldiers. The Ottomans lost up to 30,000 men, the Grand Vizier, all their artillery, and their banners. The Austrian commander saved Hungary, clearing the way south for the next strike. It was a flawless tactical victory and a demonstration of the superiority of European discipline and firepower over traditional Ottoman tactics and numerical strength. The Ottoman cavalry, which had once held all of Europe in fear, now shattered against the ranks of Austrian infantry with bayonets, who met them with a storm of fire. The Janissaries could no longer be saved by their courage alone. Wars were no longer won solely by bravery, but by technology as well. After Petrovaradin, the Austrians' main target became Belgrade. Not merely a city, but the largest and most modern fortress in the Balkans, standing at the confluence of the Danube and Sava. Whoever controlled Belgrade controlled the entire river logistics of the region and possessed an ideal bridgehead for striking in any direction, either into the heart of Christian Europe or deep into the Ottoman Balkans. In 1717, Prince Eugene of Savoy besieged Belgrade. Meanwhile, a huge Ottoman relief army approached the fortress and surrounded the Austrians themselves. Trapped between the fortress walls and the enemy army, with his forces being weakened by disease, Savoy took a risk. Attacking under the cover of dense fog, the Austrians utterly crushed the relief army, and the garrison of Belgrade capitulated. Prince Eugene of Savoy became the architect of Austrian military greatness. He prevailed not only through tactical ingenuity, but also by brilliantly organizing logistics, reading the terrain flawlessly, and motivating his soldiers even in the most difficult moments. He transformed the Austrian army into one of the most formidable military machines in early 18th century Europe. After the fall of Belgrade, which had become a forward fortress, the Habsburgs found themselves one step away from driving the Ottomans out of the Balkans. Yet, the Austrian advance came to a halt. The farther the army advanced south of the Danube, the more stretched its supply lines became. The roads in the Balkans were dreadful, as many as 30-40% of soldiers died not from Turkish bullets or sabres, but from dysentery, malaria, and plague. The prolonged war required enormous sums of money, which Vienna no longer had. Maintaining the newly acquired war-ravaged territories proved extremely difficult. Moreover, the Empire faced the threat of a new war in Western Europe. ...against the Kingdom of Spain and the Bourbon Dynasty. Meanwhile, the Ottoman Empire, despite suffering considerable losses, remained a vast state with inexhaustible human resources. In 1718, the parties signed the Treaty of Passarowitz. For the Habsburgs, this was the peak of their success in the Balkans. They acquired the Banat, northern Serbia with Belgrade, and part of Wallachia. It seemed that one more push would finally drive the Ottomans out of Europe. For the next two decades, the conquered lands were home to a territory known as Austrian Serbia. Vienna sought to transform the region into a model European province. It built new fortifications in Belgrade according to European standards, encouraged the settlement of German colonists, and developed trade. But religious and cultural realities quickly shattered this idyllic picture. The Habsburgs' rigid Catholic policies often provoked discontent among the local Orthodox population. Vienna imposed high taxes and placed trade under its control. Ultimately, for ordinary Serbs, the pressure of the new authorities proved almost harsher than life under the Turks. Meanwhile, Istanbul was experiencing one of the most brilliant periods in its history, the Tulip Era, recognizing a need for technological advancement. Ahmed III opened the Ottoman Empire to European knowledge and experience. The city saw the emergence of the first Muslim printing presses, Ottoman Baroque-style palaces, while the cultivation of tulips became a symbol of a new, peaceful life. But this transformation came at a price. The extravagance of the court was paid for through ever-higher taxes, provoking the fury of townspeople and janissaries. In 1730, the bloody Patrona Halil uprising destroyed the entire glittering picture within mere days, returning the empire to a harsh reality. Ahmed III abdicated, and the new sultan, Mahmud I, inherited an empire that had already begun to change, and was far more dangerous than its neighbors imagined. The peace held until 1737, when a new Austro-Turkish war erupted. This time, the Habsburgs entered the conflict as allies of another long-standing enemy of Of the Ottomans, the Russian Empire In the east, Russian forces waged a difficult but overall successful campaign against the Turks and the Crimean Khanate. They stormed Ochakiv, advancing toward the Crimean peninsula. In Vienna, they expected an easy march all the way to Istanbul, but the campaign turned into a complete catastrophe. The Ottoman Empire did not waste any time. The Turks took their previous mistakes into account and thoroughly modernized their artillery and engineering units with the help of European advisors, most notably the French officer Claude-Alexandre de Bonneval. He converted to Islam and took the name Humbaraja Ahmed Pasha, establishing in Istanbul one of the first modern artillery schools and a European-style military academy. This renegade introduced strict discipline and taught the Turks to maneuver artillery rapidly during battle. The Habsburgs entered the new war in the worst possible condition. The treasury was empty. Prince Eugene of Savoy had died a year before the new conflict began. For decades, he had single-handedly headed the Hofkriegsrat, commanded the imperial armies, and conducted diplomatic negotiations. His authority was absolute, but he had one enormous flaw. Savoy could not tolerate competition and therefore failed to cultivate a worthy successor. When he died, Emperor Charles VI found himself facing a vacuum. The war council turned into a nest of intrigues, where positions were awarded based on noble birth rather than military merit. The new command suffered from incompetence, infighting, and a lack of initiative. 1739, the Balkans. After the death of Prince Eugene of Savoy, the Austrian army was placed under the command of Count von Wallis, an experienced commander afflicted with the worst disease of generals, arrogance. In his pocket, he carried the emperor's order, attack at the first opportunity. Waldstein knew that a huge Ottoman army was moving toward Belgrade, but he did not want to share the glory with other generals. He also knew that an Austrian corps with reinforcements was only a day's march behind, and yet he ordered the advance. The field marshal was certain that the Ottomans would scatter at the mere sight of the imperial uniforms. In his pursuit of triumph, He made a fatal mistake. He advanced blindly. No sentries, no reconnaissance. The Austrian army marched straight into the darkness. The night of July 21st was suffocating. A 50,000-strong Austrian army descended into a deep ravine densely overgrown with forest near the Balkan village of Grotska. At the front marched the pride of the empire, the heavy cuirassier cavalry. Armored riders, hemmed in by steep slopes as though trapped in a stone sack, were forced to move almost shoulder to shoulder. Valis had no idea that on the heights above the ravine, a 100,000-strong army under Grand Vizier Ivas Mehmed Pasha had already been standing motionless for several hours. The Ottomans of 1739 no longer resembled the army that Europeans had been accustomed to crushing for decades. Thanks to Bonneval, their artillery had been significantly modernized, while their tactics had adapted to new realities. The Janissaries and the new artillery lay concealed in the undergrowth, perfectly camouflaged. They could see the Austrians as if they were in the palm of their hand. The Imperial Army had walked straight in to the wolf's jaws, cutting off all its own avenues for maneuver or deployment into battle formation. The first rays of sunlight were shattered by a volley of fire from several directions at once. The ground shook, and the morning mist instantly gave way to thick clouds of gunpowder smoke. The Austrian cuirassiers burned under the crossfire. Their massive armor, designed to protect them from cold steel, became a deadly trap under the impact of heavy Ottoman bullets and devastating grapeshot. The troops could not deploy for an attack. The narrow space, steep slopes, and barricades of trees that the Turks had prepared in advance made it impossible. They could not retreat, either. Their own infantry, still blindly and relentlessly pressing forward from behind in the ravine, had not yet seen the battlefield and was simply following orders to march ahead. Total chaos ensued. Wounded horses, maddened by pain and fear, threw off their riders and trampled their own infantry. A bloody carnage of metal, people, and animals formed at the bottom of the ravine. Faced with a sudden catastrophe, the Austrian field marshal lost his head. Instead of halting the column and immediately pulling his troops out from under fire, he acted like a blinded, desperate gambler in a casino. Wallis threw more and more troops into the meat grinder, hoping to break through the Ottoman positions with a frontal assault. Infantry battalions entered the ravine and died in the mud under a hail of lead. The Empire's finest regiments were ground down without ever seeing the enemy. This was no longer a battle. It was a massacre. Up to 10,000 killed and wounded in a single day. Colossal losses by the standards of European armies of the time. But even more devastating was the shattered morale and humiliation of the Imperial army. Under the cover of night, abandoning cannons, tents, and supply wagons, the Austrian army retreated in chaos. The Battle of Grodzka was not merely a tactical failure, but a geopolitical collapse for Vienna. Morally broken, Wallisch shut himself behind the formidable walls of Belgrade and soon declared that the city could not be held, ordering a retreat across the Danube. Having underestimated the enemy, the Austrians were confronted with a powerful counterattack. The Ottomans laid siege to Belgrade. Paralyzed by fear, the Austrian commanders and diplomats signed the humiliating Treaty of Belgrade. Without a prolonged siege, the Habsburgs surrendered to the Ottomans everything they had spent decades conquering. Northern Serbia, Wallachia, and the key to the Balkans, the fortified city of Belgrade. The border between the enemies was fixed for many years along the Danube and Sava rivers. A military tribunal sentenced Field Marshal Wallis to imprisonment in Spielberg Fortress. A year later, following the death of Charles VI, the condemned man was pardoned by the Emperor's daughter, Archduchess Maria Theresa of Austria. Even so, Wallis' military reputation was tarnished forever. It was a harsh historical lesson. There is nothing more dangerous on the battlefield than a commander who believes that glory belongs to him personally and that the enemy is unworthy of respect. The Treaty of Belgrade drew a line under this great era. For the Ottoman Empire, the outcome was ambiguous. It had permanently lost hope of conquering Central Europe, but it had managed to defend its Balkan heartland, proving that it remained a formidable military power. The Sublime Porte had finally transformed from an existential threat capable of destroying Christian Europe into an influential regional power with which ordinary territorial disputes could be waged. Through these wars, the Habsburg state was ultimately transformed from a German political entity into a great multinational Central European empire. Yet their dream of completely defeating the Turks was shattered by logistical and financial realities. After 1739, the era of Istanbul's attempts to alter the balance of power in Central Europe came to an end. A new player, far more dangerous to the Ottomans, entered the stage, the Russian Empire. The Habsburgs understood that they were incapable of conquering the Balkans on their own, and from then on they divided spheres of influence with the Romanovs. From that point onward, it was the Russo-Turkish wars that became the principal military factor in the destruction of Ottoman power in Europe, while Austria increasingly acted in these conflicts sometimes in coordination with, and sometimes in rivalry with, Russia, depending on the political circumstances.