After the outbreak of War of Resistance against Japanese Aggression, in the spring of 1938, Foucault went to Yan 'an Shanbei College to study, and joined China Producers' Party. In the same year, in order to further mobilize and organize overseas Chinese to participate in the anti-Japanese national salvation movement, the Central Committee of the Communist Party of China sent personnel to form overseas missions to carry out overseas Chinese affairs in Southeast Asian countries. Foucault was elected to an overseas mission and was sent to Vietnam by the party to launch overseas Chinese to support the motherland's anti-Japanese war. /kloc-in the autumn of 0/938, he joined an overseas mission and was sent to Vietnam by the Central Committee of the Communist Party of China to mobilize overseas Chinese to support the motherland's anti-Japanese war. In Saigon, in order to publicize and mobilize overseas Chinese to participate in the national anti-Japanese and national salvation movement, he often went deep into various trade union organizations, and in places where there were overseas Chinese, he visited lanes, ran teahouses and pubs in running broker day and night. Through the establishment of newspapers, workers' night schools and other forms to carry out anti-Japanese propaganda, overseas Chinese's awareness of supporting the motherland's anti-Japanese war has been continuously improved, and they have donated money and materials to set up Vietnam Qiongya Overseas Chinese Salvation Association, and Foucault was elected as the Standing Committee. On February 1939, 10, Japanese invaders occupied Qiongya. Foucault mobilized overseas Chinese in Qiongya to set up the "Vietnam Qiongya Overseas Chinese Returning Service Group", broke through the Japanese naval blockade and returned to Qiongya to participate in the Anti-Japanese War. In order to strengthen leadership and unify actions, with the approval of Hong Kong Qiongya Overseas Chinese Federation, on June 1940 and 19, Vietnamese delegations, Hong Kong delegations and Sin Chew delegations set up the "Qiongya Overseas Chinese Federation's Home Service Mission" in Shude Township, Qiongshan County, with Foucault as the general head and concurrently as the director of the "Qiongya Overseas Chinese Federation's Office in Qionglai Relief Department". Under the leadership of Foucault, the "Jiangjuntuan" was immediately divided into several task forces to carry out anti-Japanese and national salvation propaganda activities in Wenchang, Qiongshan, Qiongdong, Ding 'an, Danxian, Chengmai and Wanning. The main tasks of the overseas Chinese returning service group are: to publicize and mobilize the people to resist Japan and save the country; Send medicines to the anti-Japanese soldiers and civilians; Communicate the contact between Qiongya and overseas Chinese; Investigate the situation, introduce the situation of Qiongya Anti-Japanese War overseas, and expose Japanese atrocities. While carrying out propaganda work, the service group also actively sent doctors and medicines to treat injuries to the anti-Japanese soldiers and civilians. At that time, the service group brought back a batch of western medicine, Chinese patent medicine and simple medical equipment. Before returning to Qionghai, the medical team of the service group had undergone special study and training, and had a certain knowledge of medical rescue, which could treat common diseases, gunshot wounds and knife injuries. From 1939 to 1940, the service group opened clinics in Wenchang, Qiongshan, Qiongdong, Le Hui, Wanning and other counties. The medical team of the service group focused on the anti-Japanese battlefield. In Wen Qiong and Meihe areas, the service team sent medical teams with the troops. After the Meihe incident, the first and second medical teams were organized successively. They went deep into the position to heal the wounded and rescue the dying, held three training courses for the independent corps, and trained more than 90 medical staff for the corps. He made an indelible contribution to the Qiongya War of Resistance.
After the Anti-Japanese War entered the stalemate stage, the Kuomintang die-hards implemented the policy of passive anti-Japanese and active anti-Japanese, and the overseas Chinese returning service group was restricted, interfered, destroyed and persecuted by the Kuomintang die-hards in Qiongya. With the support of the Qiongya Special Committee, the "Qiongya Overseas Chinese Returning Service Group" with the goal of "saving the country and saving the hometown" was announced on June 1940, with Foucault as the head. Under the leadership of Foucault, the General Service Corps was divided into several task forces to carry out anti-Japanese national salvation propaganda activities in Wenchang, Qiongshan, Qiongdong, Ding 'an, Danxian, Chengmai, Wanning and other places, organize battlefield rescue, relief of refugees and delivery of medicines to farmers, and organize various anti-Japanese groups, which effectively promoted the anti-Japanese national salvation struggle of the people of Qiongya. /kloc-in the spring of 0/940, the Kuomintang launched the first anti-Japanese climax, and the anti-Japanese activities of the service group were also obstructed, restricted and threatened by the Kuomintang die-hards. Foucault was fully prepared for the dangers in the anti-Japanese struggle. In his letter to his family, he said: "I live in a difficult and dangerous environment. If I dare not go forward and seek a national way out, my motherland will not have a bright future. "
1in August, 940, in order to urge the Kuomintang authorities in Qiongya to unite against Japan, Foucault stepped forward, regardless of his personal safety, and took a "general meeting" letter and condolences with Wei Yiguang (underground party member), the third district head of Qiongshan County, the Kuomintang, to meet with Wang Yi, the police commander and Wu Daonan, the Commissioner in the Hanlin market in Ding 'an County, as a sign of unity against Japan. Wu Daonan ordered his men to kill Foucault and Wei Yiguang on their way back, creating a "Fu Wei murder case" that caused a sensation at home and abroad. Foucault was only 26 when he died.