The Siege of Belgrade occurred from July-29 August 1521. Sultan Suleiman I laid siege to the Hungarian fortress of Belgrade. The walls were undermined by mining and seven days of heavy bombardment. Thereafter the city was assaulted and conquered without great difficulty and with little loss of soldiers. Belgrade became an important military base for further operations in Europe and the seat of the Pashalik of Belgrade. During Ottoman rule Belgrade became one of Europe's largest cities. The conquest eventually led to the Battle of Mohács and to the conquest of a large part of the Kingdom of Hungary by the Ottomans.