Sounds like a fascinating project. I think half the pleasure of writing fanfic is having an excuse to do in depth research.

In order to give you some lighter moments, why not go and watch a few episodes of 'Allo Allo'

There plenty of clips on You Tube and there must be complete episodes somewhere. The French Resistance in comedy... https://www.youtube.com/watch?v=f6qRvZe8kLQ&index=5&list=PLHN7G9IVyJ3PwzW3DFkEUjUl_4f-QKvTf