How "big" was the Polish-Soviet War?

According to Robert M. Citino, Hans von Seeckt and Germany's intelligence estimated the size of Red Army forces fighting against Poland in the Summer of 1920 as 1,500,000 men. Von Seeckt also estimated, that Poland was unable to muster more than 450,000 against that. Erich Wollenberg, "The Red-Army", gives the strength of the Western Front of the Red Army in the Summer of 1920 as 795,645 men (he claims that his sources are "statistics of the equipment and commissariat departments of the General Staff of the Soviet Union"). But apart from the Western Front, also the South-Western Front and some detachments from other Fronts were involved in Poland. Norman Davies, "White eagle, red star..." wrote that Soviet forces involved against Poland in the Summer of 1920 were some 800,000 strong and that Polish forces peaked in August, reaching 738,000 (much more than according to von Seect).

Do you have some good data? Which of these estimates are best?

Assuming that the Western Front had 796,000 (as Wollenberg wrote), and that the South-Western Front was nearly as strong as that, it seems that von Seeckt's estimate of 1,5 million for the Red Army can be close to the truth, right? But his estimate for Polish forces seems too low.