With Western support against the Ottomans still unsolidified, David prematurely asked the Sultan for a remission of the tribute paid by his predecessor. Even worse, he made these demands through the envoys of Uzun Hassan, who made even more arrogant demands on behalf of their master. Sultan Mehmed dismissed them, telling they would know his answer later. That answer came the summer of the next year: a fleet under his admiral Kasim Pasha sailed along the Black Sea coast of Anatolia towards Trebizond while he led an army from Bursa eastward towards the city.