Political map of China, Japan, Korea, and Mongolia 1 June 1949 (Crossing the Yangtze): Peace negotiations broke down in April and the Communists (Communist Party of China) resumed their advance. On the 20th, they crossed the Yangtze River (Yangtze River). Nanjing (Nanjing) fell on the 24th, just as the Nationalists (History of the Republic of China) evacuated their government to Canton (Guangzhou).