Belgrade was an important fortified town of the Serbian Despotate and the key fortress of the Hungarian defense line after the Ottoman subjugation of Serbia in 1439.

[6] The Ottoman Army, commanded by Sultan Murad II and Ali Beg Evrenosoglu, built a wall around the city and used it to hurl stones at its fortifications.

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.

Although Evrenosoğlu already had the title of bey at that time, he decided to personally lead the assault on the walls of the Belgrade castle, in hopes of increasing his already great reputation.

When the sultan himself saw that this device would not help him capture the fortress, he returned home in confusion, having lost, or so it is said, 17,000 of his people, and having devoted seven months to the siege.