This isn't a book that has to do with the American Civil War, but it was written at the same time Michael Shaara was writing the Killer Angels. It wasn't published then, but his son went on to have it published, the unedited version a few years back. There are parallels in this book for anyone who has enjoyed or been influenced by Shaara's "The Killer Angels." The book does have conversations in it about the Civil War & World War II. It takes place in Florida at a fictional University "Cawdor." The premise for the book is that the school's president will not allow a short story to published in the University's Newspaper. This starts a school protest, sit in. I read it in two sittings. With the first day being 3 chapters, & then I couldn't put it down the following day until I finished it. Though not a Civil War companion book perhaps it serves well as a Michael Shaara Companion book to the "The Killer Angels." You can order it online fairly easy. I don't think you will regret it.