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
Albanian language include Andrea Bogdani (1600–1685), author of the first Latin-Albanian grammar book, Nilo Katalanos (1637–1694) and others. Albanian is known within historical linguistics as a case of a language which, although surviving through many periods of foreign rule and multilingualism, saw a "disproportionately high" influx of loans augmenting and replacing much of its vocabulary. Other languages influenced Albanian and high-end estimates classify the majority of Albanian vocabulary as loanwords, suggesting that more than 90% of the present Albanian vocabulary is Latin, Greek,Slavic, Italian and Turkish loanwords, with the biggest influence being Latin. The chief sources of (Proto-) Albanian are (Ancient) Greek,