These letters chronicle the wartime courtship of a Confederate soldier and the woman he loved a sister-in-law of Abraham Lincoln. It is a relative rarity for the correspondence of both writers in Civil War letter collections to survive, as they have here. Rarer still is how frequently and faithfully the two wrote, given how little they truly knew each other at the start of their exchange. As a romantic pair, Nathaniel Dawson and Elodie Todd had...