Born in Łuniniec, Poland, as a young girl Poznańska was associated with the Polish Home Army during the 1944 Warsaw Uprising during World War II, which led to her internment in the Bergen-Belsen prisoner of war camp and her receipt of a war medal following the war.
It was directed against the area Hancewicze-Morocz-Lenin-Łuniniec, a thinly populated area of about 4,000 square kilometers southwest of Słuck on the southern border of the Regional Commissartiat White Ruthenia.