Early map regarding the Belgrade siege in 1717 folding as issued, published circa in 1720 in watermarked paper, blank on verso good and clean map The siege of Belgrade was the capture by the Habsburg forces under the command of Prince Eugene of Savoy of the strategically-important city of Belgrade from the Ottoman Empire. It took place during the Austro-Turkish War (1716–1718), barely a year after the Habsburg victory at the Battle of Petrovaradin (Peterwardein). The Imperial Army routed the Ottoman relief army under Grand Vizier Hacı Halil Pasha on 16 August. As a consequence, the Belgrade garrison, deprived of relief, surrendered to Habsburg forces on 21 August. Ottoman Sultan Ahmed III sued for peace, resulting in the Treaty of Passarowitz a year later, which completed the transfer of the remainder of Hungary, the Banat of Temeswar with lower Syrmia, and the city of Belgrade with central Serbia into Habsburg hands.[10][2]