Siege of Vienna

Infobox Military Conflict
conflict=Siege of Vienna


caption=Engraving of clashes between the Austrians and Ottomans outside Vienna, 1529
partof=the Ottoman wars in Europe and Ottoman-Habsburg wars
date=27 September-October 14, 1529
place=Vienna, Austria
result=Decisive Austrian/Habsburg victory
combatant1= flagicon|Austrian Empire Austria, with Bohemian,
German, and Spanish mercenaries
combatant2=flagicon|Ottoman Empire|1453 Ottoman Empire
flagicon|Moldavia Moldavia
Serbs
commander1=Wilhelm von Roggendorf, Niklas Graf Salm
commander2=Suleiman I
Grand Vizier Pargalı İbrahim Pasha
strength1="c." 17,000 [Turnbull says the garrison was "over 16,000 strong". "The Ottoman Empire", p 50; Keegan and Wheatcroft suggest 17,000. "Who's Who in Military History", p 283; Some estimates are just above 20,000, for example: "Together with Wilhelm von Roggendorf, the Marshal of Austria, Salm conducted the defense of Vienna with 16,000 regulars and 5,000 militia." Dupuy, Trevor, "et al", "The Encyclopedia of Military Biography", p 653.]
strength2="c." 120,000 Turnbull suggests Suleiman had "perhaps 120,000" troops when he reached Osijek on 6 August. "The Ottoman Empire", p 50; Christopher Duffy suggests "Suleiman led an army of 125,000 Turks". "Siege Warfare: Fortresses in the Early Modern World 1494-1660", p 201. For higher estimates, see further note on Suleiman's troops.]
casualties1=Unknown but many peasants killed [Turnbull, Stephen. The Ottoman Empire 1326 - 1699. New York: Osprey, 2003.pg 51 ]
casualties2=Unknown, heavier than Habsburg victors [Turnbull, Stephen. The Ottoman Empire 1326 - 1699. New York: Osprey, 2003. pg 51 ]

The Siege of Vienna in 1529, as distinct from the Battle of Vienna in 1683, was the first attempt of the Muslim 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 the end of Ottoman expansion in central Europe, though 150 years of tension and incursions followed, culminating in the Battle of Vienna in 1683. ["The failure of the first [siege of Vienna] brought to a standstill the tide of Ottoman conquest which had been flooding up the Danube Valley for a century past." Toynbee, p 119; "The expedition had been successful at least politically. Suleiman had driven Ferdinand out of Hungary and installed in his place an obedient vassal. But more significant was the fact that a Turkish army had been beaten back before the walls of Vienna by a force much inferior in numbers. This may be considered the beginning of the end of Ottoman military superiority…at Vienna Suleiman discovered that western artillery was equal to his own and that Austrian and Spanish foot soldiers with their harquebuses and long pikes, were, if anything, superior to his janissaries." Stavrianos, p 77; "Sitting outside the Habsburg capital, with his army beset by seemingly insurmountable logistical problems, Suleiman was brought to conclude that the Ottoman Empire could expand no further into Europe, that Muslim expansionism in Eurasia had reached, indeed had probably extended beyond its destined territorial limits." Sicker, p 1-2.]

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. [It was an "afterthought towards the end of a season of campaigning". Riley-Smith, p 256; "A last minute decision following a quick victory in Hungary". Shaw and Shaw, p 94; Other historians, for example Stephen Turnbull, regard the suppression of Hungary as the calculated prologue to an invasion further into Europe: "John Szapolya ["sic"] became a footnote in the next great Turkish advance against Europe in the most ambitious campaign of the great Sultan’s reign." Turnbull, p 50.]

Background

"Main article in Battle of Mohacs, Campaign of Ferdinand I"

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 Pozsony on 26 October [Turnbull, Stephen. The Ottoman Empire 1326 - 1699. New York: Osprey, 2003. pg 49 ] , Ferdinand was declared King of Hungary due to his marriage to Louis' sister and his own sister being the widow of Louis. Ferdinand set out to enforce his claim on Hungary and captured Buda [Turnbull, Stephen. The Ottoman Empire 1326 - 1699. New York: Osprey, 2003. pg 49 - 50 ] . 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 [Turnbull, Stephen. The Ottoman Empire 1326 - 1699. New York: Osprey, 2003. pg 51] .

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. [Turnbull suggests Suleiman had "perhaps 120,000" troops when he reached Osijek on 6 August. Turnbull, p 50; Very high figures appear in nineteenth-century histories, for example that of [http://books.google.co.uk/books?vid=0zRFtosoqy7acsmJ&id=pZoBAAAAQAAJ&pg=RA5-PA136&lpg=RA5-PA136&dq=300,000+inauthor:Augusta+inauthor:Theodosia+inauthor: Augusta Theodosia Drane] in 1858, "more than 300,000 men"; such estimates may derive from contemporary accounts: the Venetian diarist Marino Sanuto, on 29 October 1529, for example, recorded the Turkish army as containing 305,200 men (mentioned in Albert Howe Lyber's "The Government of the Ottoman Empire in the Time of Suleiman the Magnificent", p 107). Modern books sometimes repeat the higher figures—for example, Daniel Chirot, in "The Origins of Backwardness in Eastern Europe", 1980, p 183, says "some 300,000 men besieged Vienna in 1529"; an alternative figure appears in "Islam at War": "The sultan’s army of 250,000 appeared before the gates of Vienna in the first siege of that great city", Walton, "et al", 2003, p 104.] As well as units of "sipahi", or light cavalry, and elite janissary infantry, the Ottoman army incorporated a contingent of Moldavians and Serbs. 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. [In April, the diploma by which Suleiman confirmed Ibrahim Pasha's appointment as "serasker" included the following: "Whatever he says and in whatever manner he decides to regard things, you are to accept them as if they were the propitious words and respect-commanding decrees issuing from my own pearl-dispensing tongue." Quoted by Rhoads Murphey in "Ottoman Warfare 1500-1700", p 136.]

Suleiman launched his campaign on 10 May 1529 and faced obstacles from the outset.Turnbull, p 50-1.] 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 hopelessly 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.Stavrianos, p 77.] The only resistance came at Pozsony, where the Turkish fleet was bombarded as it sailed up the Danube.Turnbull, p 50-1.]

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. [Keegan and Wheatcroft, p 283.] 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.Stavrianos, p 77.]

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.Turnbull, p 50-1.] 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.Turnbull, p 50-1.]

iege

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 as emissaries three richly dressed Austrian prisoners to negotiate the city's surrender; Salm sent three 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.Turnbull, p 50-1.]

As the Ottoman army settled into position, the Austrian garrison launched sorties to disrupt the digging of sap trenches and mines, in one case almost capturing Ibrahim Pasha. The defensive forces 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.Turnbull, p 50-1.]

More rain fell on 11 October, 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. [Spielman, p 22.] Even the elite janissaries now voiced discontent at the state of affairs.Fisher, p 214.] 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. [Stavrianos, p 78.] On the night of 14 October, the Viennese heard screams from the opposing camp, the sound of the Ottomans killing their prisoners prior to moving out.Turnbull, p 50-1.] Some defenders who had foreseen only surrender interpreted their deliverance as a miracle.Fisher, p 214.]

Unseasonably heavy snow helped turn the Turkish retreat into a disaster, in which they lost much baggage and artillery. Their fleet was again attacked at Pozsony, and more Turks than attackers are thought to have died in the skirmishes along the route.Turnbull, p 50-1.]

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. [Tracy, p 140.] 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. [ Riley-Smith, p 256.] 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. [Shaw and Shaw, p 93.]

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. ["This may be considered the end of Ottoman military superiority." Stavrianos, p 78.] "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". [Kann, p 38.]

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. [Entry on Salm. Dupuy, "et al", p 653.] 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. [Louthan, p 43.]

ee also

*Battle of Tours

References and notes