On this day 85 years ago, on January 31, 1940 (December 23, 1939 in the lunar calendar), Zhu De, Peng Dehuai and others sent a letter to Chiang, opposing Wang Jingwei's signing of a secret treaty of treason with Japan. On January 31, 1940, Zhu De, Peng Dehuai and others sent a letter to Chiang, opposing Wang Jingwei's signing of a secret treaty of treason with Japan