Timeline of Albanian history to 1993 cooperation signed with Yugoslavia; Yugoslav advisers and grain begin pouring into Albania. October<br> 26 October: Two British ships destroyed by mines off Albania's coast in the Straits of Corfu, see Corfu Channel Incident, . November<br> Albania breaks diplomatic relations with the United States after the latter withdraws its informal mission. 1947 April May<br> A United Nations commission concludes that Albania, together with Bulgaria and Yugoslavia, supported communist guerrillas in the Greek Civil War; Yugoslav leaders launch verbal offensive against anti-Yugoslav Albanian communists, including Hoxha; pro-Yugoslav faction begins to wield power. July<br> Albania refuses participation in the Marshall Plan of the
Cham Albanian dialect such. Researchers like Tom Winnifirth on short stays in the area have hence found it difficult to find Albanian speakers in urban areas and concluded in later years that Albanian had "virtually disappeared" in the region. According to Ethnologue, the Albanian speaking population of Greek Epirus and Greek Western Macedonia number 10, 000. According to Miranda Vickers in 1999, Orthodox Chams today are approximately 40,000. Cham Albanian dialect The Cham Albanian dialect () is the dialect of the Albanian language spoken by the Cham Albanians, an ethnic Albanian minority in the Epirus region of northwestern Greece. Cham Albanian is part