In the fifth item of the second part of the 1990 paper by Tong Zeng, according to the provisions of international law, indiscriminate bombing is a war crime. Letters to Tong Zeng from the victims of the carpet bombing that a large number of Japanese military planes continuously manufactured in Chongqing, China, known as the "Bombing of Chongqing" in history. There are letters from the victims of the "Wuhan Indiscriminate Bombing" in China. There are letters from the victims of the "Nanjing Indiscriminate Bombing." There are also letters sent to him by victims of indiscriminate bombing in small and medium-sized cities.