In 1944, he secretly returned to Vietnam and was made leader of the Communist Party committee branch in Quang Trach Phu, served as editor-in-chief of the "Hong Lac Newspaper", built up the Trung Thuan Military Zone, trained the armed forces, and participated in the August Revolution. After the August Revolution, he was nominated as the leader of the Viet Minh in Quảng Bình Province. He was a member of the first session of the National Assembly of Vietnam.