that it was on this date, September 17th 1939, that the Soviet Union invaded Poland from the east, more than two weeks after Nazi Germany had launched its assault from the west. And then five years later exactly, in 1944 Operation Market-Garden started with the para drops behind German lines in the Netherlands.
All I found was "the Politburo called it "the liberation campaign." Maybe the Soviet military had a catchier name?
Here's a link about the invasion from the Polish perspective... THE SOVIET INVASION OF POLAND DURING WORLD WAR TWO
You have to wonder where the Poles were, with half the country being Germans and the other half being Russians.
Due to Polands difficult history (which is not more difficult than the one of other countries, but...) it's hard to say whether this part is "german" or "russian". In every of those "zones" lots of Poles where living. Soem Germans still claim West Poland (and it's their right to do it, but it's hard to gain territory when you loose a war ). I, as a Half-Pole and Half-Serb, know many Poles whose families came from those areas, Lwow (ukr. L'viv) and Wilno (Vilnius). They tell stories of deportation and with which hatred the other nations there showed them. ( I even heard a story of two rich families, one Polish and one one lithuanian. Their houses where standing opposite to each others in the city. They hated each other that much, they were shooting to each other with rifles and (!) cannons.) Territorial Politics are a difficult and heavy topic
Germany and the USSR didn't seem to have a problem figuring it out. (And I was being facetious there. )
Doesn't help when they're mondo obscuro, does it? Don't worry about it. I was making puns in German one day and my prof. about straggled me.