Kopernik fought on the Polish side in war against the Germans !!!
And still he wrote this under every of his famous books (for Poles to find):
The Copernicus manuscript book states : [...] Nicolaus Copernicus Canon [in] Warmia, in Prussia Germaniae mathematician...(Nicolai Copernick Canonici Varmiensis, in Borussia Germaniae mathematici)
Your teacher seemed to have left that little fact out...wonder why....
not to mention the facts that he was born into a GERMAN family, spoke GERMAN and visited GERMAN schools and that his uncle was the famous bishop Lucas Watzenrode...you never heard of that in school, right?
I'm sorry, but there is a bit of a different in forcibly being occupied and having regulations on who go's in and out, and someone who is born within Polands boundaries and has the freedom to go to which ever country or land he chooses.
Poles also could leave Prussia...it wasn't a jail you know....