On December 4, 1939, the fourth army of the Japanese army attacked the northeastern military mainland of Kunming, and on December 4, 1939, the fifth army of the Northern Army under the command of Duo Ming launched a positive offensive against Kunming. On December 18, the Chinese army began an offensive against the Japanese army in the northeastern part of Kunming. On December 28, the Japanese army began an offensive against the Japanese army in the northeastern part of Kunming. On the 31st day, the new twenty-two divisions of Duo Ming and the first fifth divisions of Duo Ming were attacked by the Chinese army for four days and four nights, and the enemy retreated to the ninth direction. According to the White Jubilee report, the Japanese Ar