Benjamin Miller is joined by Nathan Raab, principal at the Raab Collection, a purveyor of historic documents, manuscripts, and autographs that range from medieval codices to notes, signatures, and letters by the likes of Napoleon and Amelia Earhart. The firm’s inventory includes several items of especially national significance, such as the never-before-seen missive by George Washington—written just before the Continental Army’s encampment at Valley Forge for the winter of 1777–1778—that is the subject of this episode.