In the Battle of Nish the crusaders were victorious and forced Kasim Pasha of Rumelia and his co-commander Turahan Bey to flee to Sofia, Bulgaria to warn Murad of the invasion. However, the two burned all the villages in their path in an attempt to wear down the crusaders with a scorched earth tactic. When they arrived in Sofia, they advised the Sultan to burn the city and retreat to the mountain passes beyond, where the Ottoman's smaller army would not be such a disadvantage.