Confederate Vampire General

When he came to America before the Civil War, he thought he could join the North and become a general, and live a happy life with his beautiful wife in his arms. But because he accidentally became a vampire, he had to join the South and embarked on the most difficult road. (This book has history, military, and vampires, although there are not many scenes) (Refer to The Vampire Diaries for settings) (I think I messed up this story a bit)