Was this migration encouraged by the government?
At that time, that region was under Russian occupation.
An application he filed in 1936 says he was born in Warsaw in 1893.
Try to come back with some coherent info if you want answers. What application?
Get your thoughts together, make some notes, and then post.
I'm trying to learn how my Polish ancestors lived.
What does that mean? How would anyone know your grandfather's personal story?