On this day, 87 years ago, on May 19, 1938 (April 20, 1938, the lunar calendar), China Air Force made an expedition to Japanese soil. Xu Huansheng led the team and returned from an expedition to Japan. On May 19, the China Air Force made an expedition to Japan. Xu Huansheng, captain of the 14th team of the Air Force, and Tong Yanbo, deputy captain of the 19th team of the 8th team, each flew a plane from Ningbo to Nagasaki, Fukuoka, Kurumi, Saga and Kyushu cities in Japan to distribute leaflets. This is the first time in Japan's history that it has been attacked by aircraft of other countries. On the 22nd, Zhou Enlai, Wang Ming, and Wu Yuzhang expressed condolences to the China Air Force personnel who returned triumphantly on behalf of the Central Committee of the Communist Party of China and the Eighth Route Army Office. Zhou Enlai delivered a speech praising their achievements. Zhou Enlai and Wang Ming (2 from left) presented flags to the Air Force Headquarters on behalf of the CPC Central Committee