Afterwards, Sinđelić fought in the Battle of Ivankovac (1805) with Milenko Stojković and Petar Dobrnjac, where the combined forces of the three military commanders defeated Ottoman General Hafis Pasha. In Ivankovac, Sinđelić proved himself as a good and capable military leader and he was subsequently appointed to be the Commander of the Resava Infantry Brigade by Karađorđe Petrović who was the commander-in-chief of the Serbian Revolutionary Army.