Mehmed was presented with the keys to some Serbian castles that had formerly belonged to the Ottomans, as well as being congratulated for his success in taking Constantinople.

The cavalry (9,000 strong as per a Venetian visiting John Hunyadi) sent against the Ottoman army by the Serbian despot trapped in Smederevo was easily repulsed.

[2] Mehmed the Conqueror then arrived at the Ostrvica Fortress,[2][note 1] where the Serbian Despot had left his kingdom's treasury to prevent it from falling into Ottoman hands.

[4] However, after heavy Ottoman bombardment resulted in the destruction of the city walls, the inhabitants decided that their situation had become untenable, agreeing to surrender in exchange for their lives being spared.

However, the news of an approaching relief army under the command of John Hunyadi caused Mehmed to lift the siege and march back to Bulgaria,[7] effectively ending the 1454 campaign by August.