Gallant Boys of Gettysburg, Bonnet and Bugles Series by Gilbert Morris and published by Moody Publishers.
Gettysburg, such a quiet little Pennsylvania town. Sarah Carter goes there to help out an old friend. Tom Majors, the soldier she loves, goes there with the army of Northern Virginia. Neither of them can know that Northern and Southern troops are about to clash at quiet little Gettysburg in the bloodiest battle of the Civil War.