Klein Lisa Klein 
Two Girls of Gettysburg [EPUB ebook] 

Lizzie and Rosanna are cousins. But when the Civil War breaks out, Lizzie finds herself committed to the cause of the Union, while Rosie is swept up in the passions of the old south. Torn in their alliances, each girl finds herself grappling with the brutality of war, and the elusive promise of love, until the battle at Gettysburg brings them together once agin.