sentences:  They won the first encounters and forced Kasim Pasha of Rumelia and his co-commander Turakhan Beg to abandon their camp and flee to Sofia, Bulgaria to warn Murad of the invasion.They burnt all the villages on their path of retreat in a scorched earth strategy.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 at such a disadvantage.