I think you did a good job of showing us the horrors of Dieppe in a way that worked with the story and also was not disrespectful at all to what really happened, and all of the political ramifications that went with it.

While it seems to be a controversial subject, it did work well as a comparison to show how experiences in Narnia can be the same in England. So far, I've found nothing that you've written in this series coming out as disrespectful. While you may be wrestling with how to make it work, to me it seems you have managed to find a good balance between the reality and fiction.