I Have Seen Him in the Watchfires by Cathy Gohlke is a stand alone sequel to the book William Henry is a Fine Name.
During the civil war, seventeen-year-old Robert leaves for North Carolina in order to bring his mother and the girl he loves to Maryland. That's his plan anyway. The trip doesn't go at all as he intends. Finding his mother is much more difficult than he expects and she is much different than he remembers.
Robert discovers who God is in difficult times. He learns that life cannot be controlled and that the only way to peace is through letting go.
This is a good book, full of danger, sorrow and joy. It Is appropriate for young adult and teen readers. You should also read William Henry is a Fine Name. It's a great story of the Underground Railroad.
For Historical Romance read about The House in Grosvenor Square.