I feel your pain. There's at least one book about Southern quilts from the Civil War.
Don't wish to excuse the makers of that quilt - no self-respecting Southerner would use the name 'Antietam' for the Battle of Sharpsburg. However, several skirmishes and actions took place at Bunker Hill VA in the summer of 1864. It's not far from Harpers Ferry. I have seen letters written by Alabama soldiers written from Bunker Hill.