 He assisted the Viet Nam Quoc Dan Dang.Based in Guangxi, Zhang established the Viet Nam Cach Menh Dong Minh Hoi meaning "Viet Nam Revolutionary League" in 1942, which was assisted by the Viet Nam Quoc Dan Dang to serve the KMT's aims.The Chinese Yunnan provincial army, under the KMT, occupied northern Vietnam after the Japanese surrender in 1945, the VNQDD tagging alone, opposing Ho Chi Minh's communist party.