Hey guys this is very good campaign indeed.
Don't forget the battle over Hkalkhin-Gol 1939 (Nomonkhan for Imperialist Japan)
These battles took the biggest air battle in single day about 250 fighters and bombers from Soviet and 170 fighters and bombers from Japs took part in one day air battle. Also massive tank battle was orchestrated by Soviet legendary general Georgy Zhukov
Sorry for bad spelling
http://en.wikipedia.org/wiki/Battles_of_Khalkhin_Gol