Fazıl Mustafa Pasha's 1690 campaign brought further success, with the recapture of Niš, Vidin, Smederevo, and Golubac. He then besieged Belgrade, using 40,000 infantry and 20,000 cavalry. On 8 October, after the defenders’ armory was destroyed in an explosion, the Habsburg commander capitulated. The recapture of Belgrade, originally conquered by the Ottomans in 1521 but lost to the Habsburgs in 1688, gave hope to the Ottomans that their military disasters of the 1680s, including the losses of Hungary and Transylvania, could be reversed.