Well, there were actually two 'PLA' during that period; new fourth army and eight route army.
The new fourth army was much more active in fighting the IJA especially in the area near Shanghui. Gregor Benton wrote a 1000 pages monster on the new fourth army and its war records and activities. (the books is a bit soft for my taste, nevertheless it is a good addition to any China-library)
New Fourth Army: Communist Resistance Along the Yangtze and the Huai, 1938-1941 by Gregor Benton
http://www.amazon.com/New-Fourth-Arm...9035194&sr=8-7
The new fourth army was much more active in fighting the IJA especially in the area near Shanghui. Gregor Benton wrote a 1000 pages monster on the new fourth army and its war records and activities. (the books is a bit soft for my taste, nevertheless it is a good addition to any China-library)
New Fourth Army: Communist Resistance Along the Yangtze and the Huai, 1938-1941 by Gregor Benton
http://www.amazon.com/New-Fourth-Arm...9035194&sr=8-7
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