Generally:
In the Third Reich in the interwar period was a very large Poles living in. They were primarily Poles natives from Silesia, Opole (approx. 700 000) and Warmia, Mazury and Powiśle (approx. 400 000), whose division boundaries after World War I has placed outside reborn homeland. To seek a also emigrants who settled in the depths of Germany for economic reasons before and after World War I (mass emigration lasted until 1932. When the borders of Germany were closed, and after 1937. When they return opened) . In the Ruhr there was also a large Poles living in, partly Germanized descendants of emigrants back to the second half of the nineteenth century, the so-called. "Ruhrpolen". It is assumed estimated that in the interwar period in Germany lived approx. 1.5 million of German citizens - Polish nationality.
website only in Polish:
http://www.wehrmacht-polacy.pl/dlaczego_wcielano.html
S. Arczynski history of service in the Luftwaffe:
http://www.wehrmacht-polacy.pl/biogram_arczynski.html
Kris