Damat Ali Pasha, the Sultan's son-in-law, left
Constantinople with a 120,000 strong Turkish Army taking nearly three months to cover the to Belgrade. There he consolidated an
Ottoman force of 150,000 soldiers, at the core of which were 41,000 elite
Janissaries and 30,000
Sipahi Ottoman cavalry, along with
Tatar and
Wallachian auxiliaries. They crossed the
Sava at
Zemun on 26 July, and moved on the right bank of the
Danube towards
Sremski Karlovci in Habsburg territory. The commander of the Austrian forces,
Prince Eugene of Savoy, decided to engage the Ottomans at Petrovaradin. Eugene arrived at the fortress on 9 July. He had arranged for the construction of a fortified encampment within the
Petrovaradin fortress which was nicknamed Gibraltar on the Danube. Eugene set the 60,000-strong Imperial army on the march from their quarters in
Futog. Inside the Petrovaradin garrison were 8,000 men consisting primarily of Serbs. Serving in the Austrian army were Croatian and Hungarian infantry and cavalry regiments (approx. 42,000 men); Serbian border soldiers from
Vojvodina; and the auxiliaries from
Württemberg. On 2 August, the first skirmish between the Imperial vanguard and Ottoman horsemen occurred when Field Marshal Count
János Pálffy, with a small body of men, lead a group on reconnaissance but ran into more than 10,000 Turkish cavalry in the area of Karlowitz. The Austrian forces managed to make it back to camp but lost 700 men in the engagement and Field Marshal Count Siegfried Breuner was captured. By the next day, the Grand Vizier had reached Petrovaradin and immediately dispatched 30,000 Janissaries against the imperial positions. The Janissaries
dug saps and began to bombard the fortress. The bulk of the Austrian army crossed the Danube on 4 August by two pontoon bridges of boats, after which on the night of 4–5 August they encamped south of Petrovaradin. Their arrival was made under the cover of an unusual summer snowstorm. ==Battle==