The Chinese Communist Party (CCP) formations represent the forces led by Zhao Enlai & Mao Tse Tung from 1930 through 1949. The CCP started fighting the KMT in 1931, and the Japanese in 1934. There was a period of uneasy alliance with the KMT from 1936 to 1940, but after that the struggle continued on against the KMT until 1949. They had some isolated battles with Warlords as well.*
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The CCP was reduced to little more than guerilla forces operating with captured weaponry by the last year of WWII because much of the Soviet supplies, and almost all of the US supplies were going to the KMT. At the very end of  WWII the number of tanks and other equipment in service with the PLA increased a great deal  after "Operation Autumn Storm", when the Soviet army attacked the Japanese KwanTung Army in Manchuria. After the surrender of 600,000 Japanese troops, the Soviet handed all their captured Japanese weapons, including over 700 artillery pieces and more then 100 tanks, to the PLA . The Soviet Union provided limited aid to the Communists during this time, however there was not a massive influx of Russian weapons to the CCP until after 1949.*
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After a successful first year of the post-WWII Liberation War defending against the KMT, the CCP went on the offensive. By 1949 they had pushed the KMT off mainland China, and were very shortly going to engage UN forces in Korea.
