穆拉德二世
Murad II approached Belgrade with his forces at the end of April 1440. Taloci was not immediately aware of the size of the Ottoman forces. He had initially intended to defeat them on the open battlefield, but when he realized his forces were heavily outnumbered, Taloci retreated to the city. Murad II ordered building of mobile towers and cannons of different sizes, fortified his position and besieged the city.