I read several Wilbur Smith books years ago and really enjoyed them ( I must be an exception to the 'boys own' rule 😉). The title sounds familiar but I don't remember the story.
Eagle in the Sky is the only one I can recall anything about, I think I've read it twice.
Have you read Night Crossing by Robert Ryan, timebug? It possibly falls into the same category. I'd like to read more by this author.