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You are correct. What I should have said (and couldn't find a way to put in a sentence) was that at some point in the Polish/Soviet war, Poland was fighting a

by vkou 2y ago

You are correct. What I should have said (and couldn't find a way to put in a sentence) was that at some point in the Polish/Soviet war, Poland was fighting a successful offensive in the USSR, won the war, and made territorial gains. I suppose I should have said, well, that.

racional 2y ago
"In areas that would later become part of the USSR". Anyway -- much better, thanks for clarifying.