Red Army In September 1930, Geng's forces merged into the Third Corps of the
Red Army's First
Army Group and he became the staff of 9th division of Third Corps. In 1933 he became the head of the 4th regiment, 2nd division of the Red First
Front Army. On 10 October 1934, he embarked on the
Long March as the pioneer of 2nd division and, in the beginning of 1935, seized a critical military fortress at Loushanguan in
Guizhou Province. As a result, he was promoted to the chief of staff of the 1st division of Red 1st Front Army after
Zunyi Conference. After arrival in northern
Shaanxi, he was severely wounded in combat. In 1936, he graduated from the
Counter-Japanese Military and Political University and was appointed the chief of staff of the Fourth Corps of the Red Fourth Front Army. The Fourth Corps had just arrived in northern Shaanxi having been commanded by
Zhang Guotao, and Geng took control of the unit.
Sino-Japanese War , Tang Yanjie and a US delegation at Miaotai village in
Hebei, February 1945. After outbreak of the
Second Sino-Japanese War, he held several leadership positions including chief of staff, deputy head, and deputy political commissar in the 385th brigade, 129th division of the
Eighth Route Army. His army occupied East
Gansu Province and was responsible for guarding the western border of the Shaan-Gan-Ning Region. During this time period, he entered the
Central Party School of the Chinese Communist Party. After graduation, he went to the
Jin-Cha-Ji Border Region and became a military leader there. He helped lead the Eighth Route Army to seize
Zhangjiakou in 1945.
Chinese Civil War In 1946, Geng accompanied Ye Jianying to participate in the Beiping Military Conciliatory Commission,
initiated by General
George C. Marshall to promote and prevent the outbreak of civil war between the Chinese Communists and Nationalists. Geng was the vice chief of staff of CCP's delegates. After the conciliation failed, he went back to the Jin-Cha-Ji Region and became the chief of staff of the Field Army in the military region. In 1948, he was appointed as the vice commander of the second army group in North China Military Region. He fought in the
Pingjin Campaign and the capture of
Taiyuan. ==Political career==