With the liberation of Greece and the start of the first round of the Greek Civil War at the end of 1944, the highlands of Epirus became a major theater of guerrilla warfare between the leftist Greek People's Liberation Army (ELAS) and the right-wing National Republican Greek League (EDES). In subsequent years (1945–1949), the mountains of Epirus also became the scene of some of the fiercest fighting of the second and bloodier round of the Greek Civil War. The final episode of the war took place on Mount Grammos in 1949, ending with the defeat of the Communists. Peace returned to the region in 1949, although because of official Albanian active involvement in the civil war on the side of the communists, the formal state of war between Greece and Albania remained in effect until 1987. Another reason for the continuation of the state of war until 1987 was that during the entire period of Communist rule in Albania, the Greek population of Northern Epirus experienced forced Albanisation. Although a Greek minority was recognized by the Hoxha regime, this recognition only applied to an "official minority zone" consisting of 99 villages, leaving out important areas of Greek settlement, such as Himara. People outside the official minority zone received no education in the Greek language, which was prohibited in public. The Hoxha regime also diluted the ethnic demographics of the region by relocating Greeks living there and settling in their stead Albanians from other parts of the country. Relations began to improve in the 1980s with Greece's abandonment of any territorial claims over Northern Epirus and the lifting of the official state of war between the two countries.