Вот, в перерыв сбегал, купил Steven J Zaloga, Poland 1939: The birth of Blitzkrieg, Campaign 107, Osprey Publishing, 2002.
Page 84:
In spite of the puny size of Polish forces in the border area, the Red Army lost 990 men and 2,383 wounded in the fighting. Tank casualties amounted to 42 combat losses and a further 429 mechanical breakdowns and other non-combat losses.
The Soviet invasion shortened the Polish campaign by several weeks. The eastern region of Poland was less developed than the western areas. It also had fewer roads and the terrain was more suitable for defence. As Rundstedt pointed out, German casualties in the second two weeks of fighting were heavier than in the first two weeks of the war as the scale and intensity of the fighting escalated. The immediate tactical consequence for the Polish army was to prevent a large portion of the forces who had retreated eastward from reaching Romania. The Red Army had captured 99,149 Polish troops by 2 October 1939. Later records state that they eventually captured 452,536 Polish troops, but this number included a significant numner of government officials, postal workers, police and other non-military personnel who were rounded up as part of the policy to "de-Polonize" the region.
