It sounds like a handful not only for ye readers to digest but for you to keep track of, as well. You might forget important details when writing when focusing on all the characters, or the reader won't be able to memorize all the characters and get them confused. If you introduce them all slowly, though, it might work out.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.