London: George G. Harrap & Company, 1933-38. First editions of each volume of Churchill's important biography of his notable ancestor, John Churchill, 1st Duke of Marlborough. Octavo, 4 volumes, bound in three quarters morocco, gilt titles and tooling to the spine, raised bands, marbled endpapers, with hundreds of maps and plans (many folding), plates and document facsimiles. In near fine condition. John Churchill, the Duke of Marlborough (1644-1722), was one of the greatest military commanders and statesmen in the history of England. Victorious in the Battles of Blenheim, Ramillies, and countless other campaigns, Marlborough, whose political intrigues were almost as legendary as his military skill, never fought a battle he didn't win. Although he helped James II crush the rebellion of the Duke of Monmouth, Marlborough later supported William of Orange against James II in the Glorious Revolution of 1688 and brilliantly managed England's diplomatic triumphs during the War of…