However, on January 30, 1799, Selim III allowed the Janissaries to return, referring to them as local Muslims from the Sanjak of Smederevo. Initially the Janissaries accepted the authority of Hadži Mustafa Pasha, until a Janissary in Šabac, named Bego Novljanin, demanded from a Serb a surcharge and murdered the man when he refused to pay. Fearing the worst, Hadži Mustafa Pasha marched on Šabac with a force of 600 to ensure that the Janissary was brought to justice and order was restored. Not only did the other Janissaries decided to support Bego Novljanin but Osman Pazvantoğlu attacked the Belgrade Pasahaluk in support of the Janissaries.