The Crossing, Last Cavaliers Series by Gilbert Morris and published by Barbour.
In the years leading up to the Civil War, widower Daniel Tremayne leaves his wife's Cheyenne family and returns to the Virginia Amish settlement where he grew up. He joins the church and remarries, but his son Yancy has trouble conforming to civilized life and the rules of the church. He continues roaming the woods and hunting. When the war begins, he jumps into the fray, despite the community's pacifism. He is soon a lieutenant under General Stonewall Jackson. When Yancy rescues a Union soldier at Bull Run, he meets the man's sister, Lorena. Will Yancy finally find a home for his heart?
