I used to love and read such stories when I was a teenager. Later, when I licked more history, they started to unnerve me. I prefer pure documentary today. It should be written in an interesting, even funny way, but must remain a documentary.

PS. Besides, Alexander isn`t a typical Polish first name, not to mention surname Milja, which sounds Serbian to me.

If I were to write about a Polish officer, I would decide on a typical Polish name e.g. Karol Szymanowski.
or Stanislaw Mikulski.
or Jerzy Radziwillowicz.
or Bronislaw Malinowski.
or Bogusz Bilewski.
These are traditional, true, patriotic Polish names. Not some Milja. It sounds awkward.

PS. I always used to laugh when reading fiction about Poland by foreign authors. They concocted so incredible situations which made Poland as magical and mysterious as Camelot.