In the summer of 1693, the Duke of Croy was given supreme command of the imperial troops in Hungary. On 5 July, a Turkish army under the grand vizier Bozoklu Mustafa Pasha set out from Edirne against Transylvania. Croy therefore decided to attack the strategically important fortress of Belgrade in order to lure the Turkish army away from Transylvania. The Ottomans had only recaptured the fortress in 1690 and renovated the fortifications in 1692 under Grand Vizier Çalık Ali Pasha.
Croy began the siege on 31 July with around 28,000 men. The garrison consisted of up to 12,000 Turks under Ca’fer Pasha. The Austrians were still waiting for reinforcements. They first crossed the Sava using a bridge built from the Gypsy Island. They then entrenched themselves near the village of Bisniza, out of range of the fortress's cannons. The Duke had received good information from the architect of the fortress, Andrea Cordona, but not all of it. He continued to wait for instructions from the Imperial War Council. On 14 August, the Turks made a successful sortie, and the field marshal was only just able to regroup his army.
The siege guns did not arrive until 26 August, and the Danube ships announced for May only on 1 September. But there were far too few of them; the Turkish fleet was about 10 times larger.
The relief army under the grand vizier Bozoklu Mustafa Pasha was also reported to be approaching. Croy wanted to save his honor and attempted all out assault. The attack on the night of 17 September however failed, not surprisingly. After suffering serious losses, the Austrians began to retreat to Petrovaradin Fortress. The army was pursued by Tatar horsemen and a battle broke out two hours before Petrovaradin, in which the Austrians lost their prisoners and their loot.
Habsburg monarchy
Ottoman Empire