On December 3, 1944, the Greek Civil War broke out. On December 3, 1944, the Greek Civil War broke out. The People's Liberation Army under the leadership of the Greek Communist Party began to fight against the British and Greek government forces. The Greek People's Liberation Army, with a population of only 20,000, was besieged by hundreds of thousands of government troops and Western multinational interference forces, especially by the United States providing the Greek government with massive military aid. Eventually, the Greek Communist Party forces declared their defeat at the end of 1949.