I think you should do it. No matter the outcome. Personal virtue should always be developed.
Remember that everything in the book should build to the conclusion, done be too obvious with the plot. Heaven for bid that maybe the Germans won the war or that Poland was never defeated. I just got done with a book called
Jerusalem Vigal and the story was great, but the end was poor. IMO If your purpose is just to entertain it wont be that good, try to inform, and make the reader think, don't spell out every historical detail but make the reader want to go learn more about it. Make it realistic, again that is my opinion. Good luck now off with you.
