DRUMMOND DE MELFORT, Louis Hector, Comte.- Traité sur la cavalerie.- A Paris: De l'Imprimerie de Guillaume Desprez, 1776.- XXII, [2], 505, [2, 1 be.] p.: 1 portada grav., 11 gravuras; 47 cm. + 1 vol. de atlas (32 gravuras; 65 cm). Original edition a monumental and consecrated work on the theme of military cavalry. The author (1721-1788) was a Cavalry Officer in the French Army during the Seven Years' War (1756-1763) where the superiority of the Prussian Cavalry was evident, so he decided to publish the present treaty, in order to reform and reorganize the French Cavalry. The complete volume of text, slightly handled, but clean, includes an allegorical title and 11 copperplate prints (eight of double-leaf), in addition to two large vignettes, one on the title page and one at the end (21x17 cm) representing a formation of four battalions. The atlas volume, with a maximum folio format, also complete, consists of 32 engravings, 29 of which are double (±96x65 cm) and three fold-outs, XIV, XV and XXV (±178x65 cm). Plates a little handled and dusty, with occasional minor stains and tears, especially in the folds, but without lack of support. The two volumes lined with different period bindings: the first, with ex-libris of the Bibliothèque du Maréchal Jourdan, presents a conventional slightly mottled tobacco sheepskin binding, a little worn but recoverable; the atlas volume, with two ex-libris of the marquis and the Count of San Payo, in full burgundy shagreen binding, presenting, in the centre of both covers, an unidentified French heraldic book stamp with a duke's crown(? ) and two necklaces of honorary orders. Both retain the original endpapers: on blue paper (à la colle), in the first volume; on blue satin paper (moirée), in the atlas. Mennessier de La Lance, I, p. 408/409.