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Siege of Vienna 1529
The Siege of Vienna in 1529, as distinct from the Battle of Vienna in 1683, was the first attempt of the Ottoman Empire, led by Sultan Suleiman I (the magnificent), to capture the city of Vienna, Austria. The siege signaled the Ottoman Empire's highwater mark and signalling the end of Ottoman expansion in central Europe, though 150 years of tension and incursions followed, culminating in the Battle of Vienna in 1683.
Some historians believe that Suleiman's main objective in 1529 was to re-establish Ottoman control over Hungary, and that the decision to attack Vienna so late in the season was opportunistic.
Background
In August 1526, Sultan Suleiman I, also known as Suleiman the Lawgiver and Suleiman the Magnificent, had defeated the forces of King Louis II of Hungary at the Battle of Mohács. As a result, the Ottomans gained control of southern Hungary, while the Archduke of Austria, Ferdinand I of Habsburg, brother of the Holy Roman Emperor Charles V, claimed the vacant Hungarian throne in right of his wife, Anna Jagellonica, sister of the childless Louis II. Ferdinand, however, won recognition only in western Hungary; a noble called John Zápolya, from a power-base in Transylvania, north-eastern Hungary, challenged him for the crown and was recognised as king by Suleiman in return for accepting vassal status within the Ottoman Empire.

Following the Diet of Bratislava on 26 October, Ferdinand was declared King of Hungary due to his mariage to Louis' sister and his own sister being the widow of Louis. Ferdinand set out to enforce his claim on Hungary and captured Buda. These gains were short-lived and by 1529, an Ottoman counter-attack swiftly negated all of the gains by Ferdinand in his campaigns in 1527 and 1528 .
 
Ottoman army
In spring 1529, Suleiman mustered a great army in Ottoman Bulgaria, with the aim of securing control of Hungary and reducing the threat posed at his new borders by Ferdinand and the Holy Roman Empire. Various historians have estimated Suleiman's troop strength at anything from 120,000 to more than 300,000 men. As well as units of sipahi, or light cavalry, and elite janissary infantry, the Ottoman army incorporated a contingent of Christian Hungarians fighting for their new Turkish ruler. Suleiman acted as the commander-in-chief, and in April he appointed his grand vizier, a former Greek slave called Ibrahim Pasha, as serasker, a commander with powers to give orders in the sultan's name.
Suleiman launched his campaign on 10 May 1529 and faced obstacles from the outset. The spring rains characteristic of south-eastern Europe were particularly heavy that year, causing flooding in Bulgaria and rendering parts of the route barely passable. Many large-calibre guns became hoplessly mired and had to be left behind, and camels were lost in large numbers.

Suleiman arrived in Osijek on 6 August. On 18 August, on the Mohács plain, he met up with a substantial cavalry force led by John Zápolya, who paid him homage and helped him recapture several fortresses lost since the Battle of Mohács to the Austrians, including Buda, which fell on 8 September. The only resistance came at Bratislava, where the Turkish fleet was bombarded as it sailed up the Danube.
Defensive measures
As the Ottomans advanced, those inside Vienna prepared to resist, their determination stiffened by news of the massacre of the Buda garrison in early September. Ferdinand I had withdrawn to the safety of Habsburg Bohemia following pleas for assistance to his brother, Emperor Charles V, who was too stretched by his war with France to spare more than a few Spanish infantry to the cause.
A. Ortelius, 1601
The able Marshall of Austria, Wilhelm von Roggendorf, assumed charge of the garrison, with operational command entrusted to a seventy-year-old German mercenary named Niklas Graf Salm, who had distinguished himself at the Battle of Pavia in 1525. Salm arrived in Vienna at the head of a relief force which included German Landsknechte mercenary pikemen and Spanish musketmen and set about shoring up the three-hundred-year-old walls surrounding St. Stephen's Cathedral, near which he established his headquarters. To make sure the city could withstand a lengthy siege, he blocked the four city gates and reinforced the walls, which in some places were no more than six feet thick, and erected earthen bastions and an inner earthen rampart, levelling buildings where necessary.
Siege
The Ottoman army which arrived in late September had been depleted during the long advance into Austrian territory, leaving Suleiman short of camels and heavy equipment. Many of his troops arrived at Vienna in a poor state of health after the privations of the long march, and of those fit to fight, a third were light cavalry, or sipahis, ill-suited for siege warfare. The sultan despatched emissaries who were 3 richly dressed austrian prisnors to negotiate the city's surrender; Salm sent 3 richly dressed muslims back without a response. Suleiman's artillery then began pounding the city's walls, but it failed to significantly damage the Austrian defensive earthworks; his archers fared little better, achieving nuisance value at best.
St. Stephen’s Cathedral around 1530
As the Ottoman army settled into position, the garrison launched sorties to disrupt the digging of sap trenches and mines, in one case almost capturing Ibrahim Pasha. The Austrians detected and blew up several mineheads, and on 6 October they sent out 8,000 troops to attack the Ottoman mining operations, destroying many of the mines but sustaining serious losses when congestion hindered their retreat into the city.
More rain fell on October 11, and with the failure of the mining strategy, the chances of a quick Ottoman victory were receding by the hour. In addition, the Turks were running out of fodder for their horses, and casualties, sickness, and desertions began taking a toll on their ranks. Even the elite janissaries now voiced discontent at the state of affairs. In view of these factors, Suleiman had no alternative but to contemplate retreat. He held a council of war on 12 October which decided on one last attack, with extra rewards offered to the troops. However, this assault, too, was repulsed, as once again the arquebuses and long pikes of the defenders prevailed in keeping out the Turks. On the night of 14 October, screams were heard from the opposing camp, the sound of the Ottomans killing their prisoners prior to moving out. Some defenders who had foreseen only surrender interpreted their deliverance as a miracle.
Aftermath
Some historians speculate that Suleiman's final assault wasn't necessarily intended to take the city but to cause as much damage as possible and weaken it for a later attack, a tactic he had employed at Buda in 1526. He led his next campaign in 1532 but was held up too long reducing the western Hungarian fort of Kőszeg, by which time winter was close and Charles V, now awakened to Vienna's vulnerability, assembled 80,000 troops. So instead of carrying out the planned siege, the invading troops retreated through and laid waste to Styria. The two campaigns proved that Vienna was situated at the extreme limit of Ottoman logistical capability. The army needed to winter at Constantinople so that its troops could attend to their fiefs and recruit for the next year's campaigning.

Suleiman's retreat did not mark a complete failure. The campaign underlined Ottoman control of southern Hungary and left behind enough destruction in Habsburg Hungary and in those Austrian lands it had ravaged to impair Ferdinand's capacity to mount a sustained counterattack. Suleiman's achievement was to consolidate the gains of 1526 and establish the puppet kingdom of John Zápolya as a buffer against the Holy Roman Empire.

The invasion and its climactic siege, however, exacted a heavy price from both sides, with tens of thousands of soldiers and civilians dead and thousands more sold into slavery. It marked the end of the Ottomans' expansion towards the centre of Europe and arguably the beginning of their long decline as the dominant power of the Renaissance world. "The delivery of Vienna by a brave garrison under Count Niklas Salm in 1529," suggested historian Rolf Adolf Kahn, "was probably a greater though less spectacular achievement than the liberation five generations later brought about primarily by the efforts of a rather large army of combined imperial and Polish forces".

Ferdinand I set up a funeral monument for Niklas Graf Salm — who had been injured during the last Ottoman assault and died on 4 May 1530 — to express his gratitude to the defender of Vienna. This Renaissance sarcophagus is now on display in the baptistry of the Votivkirche in Vienna. Ferdinand's son, Maximilian II, later built the summer palace of Neugebaeude on the spot where Suleiman is said to have pitched his tent.
 
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