The Ottoman Empire and British Empire were involved in different capacities: the Ottoman Empire left the region after the Armistice of Mudros but British influence continued until Dunsterforce was pulled back in the 1920s. The conflicts involved civilians in the disputed districts of Kazakh-Shamshadin, Zanghezur, Nakhchivan and Karabakh. The use of guerrilla and semi-guerrilla operations was the main reason for the high civilian casualties, which occurred during the nation-building activities of the newly established states.