Henri de la Tour d'Auvergne, Vicomte de Turenne (1611–1675) was the most famous French military leader during the early reign of Louis XIV, who became Marshal General of France. Uncommon ALS signed vertically in the left border, one page, 6 x 8.25, April 27, 1636. Untranslated letter to the bishop of Mandé on military matters, mentioning Cardinal de la Valette. Autograph address panel maintains his original seals and silk ribbons. In very good condition, with intersecting folds and scattered foxing and soiling. RR Auction COA.