Like many of the others who served in high ranking positions under Kim Il Sung, Kang had served with Kim in Manchuria fighting against the Japanese. While in
Manchuria he organized and commanded the
Jilin Peace Preservation Army. Even though Kang (and other Koreans fighting in Manchuria) had better military credentials than Kim, Kim was encouraged to take the reins of the new communist country because of his ability to cultivate the Russians. In the summer of 1946, Kang returned from
Soviet Russia to North Korea to help establish the
Korean People's Army and by 1948 he was appointed the Chief of the
General Staff Department, and was an important figure in the planning of the South Korean invasion with the help of Russian war strategists and was selected to lead the invasion. According to the
CIA, as of late 1947, Kang commanded a force of approximately 21,000 troops, composed of units such as the 17th Column, the 5th and 6th Independent Divisions and the 1st and 2nd Peace Preservation Brigades in
Yanji. He was a member of the
Central Committee of the Workers' Party of Korea and a member of the
Supreme People's Assembly. Kang was known as a ruthless soldier, as was reflected in the armies he commanded; they were aggressive, insensitive to risk, and eager for a victory by August 15, as Kim Il Sung demanded. ,
Kim Chaek,
Kim Il, and Kang Kon receiving the first domestically produced
Type 49 submachine guns from President
Kim Il Sung, 1949. ==Korean War==