The Turkish advance in the Balkans provoked a new
crusade. The Ottoman army commanded by Vizier Candarli Ali Pasha defeated the Bulgarians and came across with the Crusaders in Kossovo. Even the most
powerful crusade units were defeated by the cannons built by the command of Murat I. After this battle the Turks had proved their authority on
the Balkans but Murad had died. Murad I was a very brilliant monarch. He extanded
the state territories to 500.000 km2.