Description：From February 1947 to the national liberation, a total of more than two years, starting from Fu Zuoyi's occupation of Zhangjiakou until two years later, under the command of Chairman Mao's superb military thinking, combined with the situation on various battlefields across the country, the Yang, Luo and Geng Corps were reorganized, and the Party Central Committee and Chairman Mao's strategic policy of "fighting mobile warfare" were implemented. They fought bravely against the powerful enemy in difficult and adverse circumstances, actively cooperated with the Liaoshen Campaign in the Northeast battlefield, and echoed with other battlefields, so that the battlefields of the Liberation War across the country were connected, and the attempt of Chiang Kai-shek's reactionary group to eliminate the Communist Party in six months was completely smashed, and the national Liberation War achieved final victory.