This may sound a bit simple, but you may wish to try forwarding that message to yourself using a secondary email address. I would think the system would treat the forward as a new message and new file and ask to download the attachment again. Of course this may mean creating a secondary email address and setting it up on your iPad, but it could be simpler than other methods.
Otherwise, I would guess you could delete the mail account from your iPad and add it back. So long as your pop/imap settings are configured to send all mail, including anything that was previously received, adding it again would grab all those messages fresh again, including the message with the attachment. If you are like me however and have a few thousand messages sitting in your email box, that step as well as deleting or archiving the thick stack of messages would be quite timely.
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.