The Lion, The Witch, and The Wardrobe by C.S. Lewis is not about World War II, except . . . it kind of is. This novel was published in 1950, but it is set in 1940. Many of the events and themes in the book would have been instantly recognizable to those who first read it, and it’s useful to point that out to children today, who will not have the same emotions and experiences as children from 1950.
The most obvious connection to the war is that the four main characters are children sent away from London to get them away from The Blitz. But there are a surprising number of other things in this story that reflect wartime experiences, from the food to being part of an underground resistance movement!