London: George G. Harrap, 1933, 34, 36, 38, 1933. ALL FIRST EDITIONS. 4 vols., 9" x 6-1/4", illustrated with 4 portrait frontispieces, numerous plates, facsimiles, maps and plans, bound in fine full dark blue morocco, ribbed gilt decorated spine, covers ruled in gilt, gilt signature of Churchill to front cover, gilt dentelles, marbled pastedowns and endpapers, all edges gilt, by Sangorski & Sutcliffe/Zaehnsdorf. Internally clean and bright, no previous ownership markings, inscriptions, or bookplate, inner and outer hinges fine, head and foot of spine fine, A FINE SET. Churchill's ancestor the 1st Duke of Marlborough led allied forces to victory against Louis XIV. Churchill worked on this his biography for almost a decade, and was given exclusive access to the Blenheim archives to research the book. On publication, this work "took its place at once among the classics of historical writing. As the story of his ancestor's leadership of a grand alliance to prevent the…