Military units of the Ottoman Empire made many raids into feudal principalities in the western Balkans at the end of the 14th century, some of them into territory of today's Bosnia and Herzegovina, long before the conquest of the Bosnian Kingdom. The first Ottoman raids led by Timurtash-Pasha happened in the eastern parts of Bosnia in 1384. The Battle of Bileća in 1388 was the first battle of the Ottoman army on the territory of today's Bosnia and Herzegovina.