Mehmed II's unsuccessful Siege of Belgrade (Nándorfehérvár) in 1456. It shows Sultan Mehmed charging to the city walls where he was seriously wounded.

Referenced on p.22 ELI - 58 The Janissaries by David Nicolle:
Siege-scene from the Süleymanname (sic) of 1558. Cannons fire from behind wooden bulwarks filled with earth, and Janissaries man the front-line trenches while Turkish cavalry drive back an unsuccessful Christian sortie. (Ms. Haz. 1517, Topkapi Lib., Istanbul)