https://en.wikipedia.org/wiki/Cursed_soldiers
In the aftermath of the joint German-Soviet invasion of Poland, the Polish government evacuated to the West and created the Polish Underground State. While no war was declared between Poland and the Soviet Union, the relations were tense, and eventually broke down in 1943 in the aftermath of the revelations of the Katyn massacre. The Soviets eventually created their own Polish communist puppet government, and refused to deal with the Underground State just like they refused to deal with the government-in-exile; its leaders and soldiers on "liberated" Polish territories were persecuted.
"My time is near. When they will be leading me out of my cell to die, my last words to my friends will be: I am happy that I will be murdered as a Catholic for my faith, as a Pole for my country, and as a human being [I will die] for justice and truth […] My last farewell will be only to you. I believe that the Holy Mother will take my soul […] and I will continue to serve Her and report to Her about the tragedy of the Polish Nation—murdered by one [nation] and abandoned by the others."