i have been reading U 46 and i can't help thinking that this will appeal to children, and i mean this with great respect. i dont know of a childrens book that deals with this campaign - maybe there is but i dont know of it.
i am thinking of childrens writers like Micheal Morpergo, William Mayne and John Boyne who wrote The Boy in the Stripped Pyjammas.
your writing is clear and easy to follow - and what better introduction to this important campaign for children, than this.
Sail on...