LS in French, signed “Np.,” one page, 7 x 7.75, March 31, 1812. Napeoleon writes from Petrov to “mon fils” [his stepson, Eugène Napoleon, son of Josephine by her previous marriage] in the midst of the Russian campaign. Matted with a color portrait to an overall size of 19.75 x 14.25. Intersecting folds touching signature, pencil underlinings and notations in another hand, and two clipped book excerpts (one an image) affixed to blank portions of letter, otherwise fine, bright condition. Auction LOA John Reznikoff/PSA/DNA and R&R COA.