Correspondents include: Maurice Ashley, WSC's researcher, on his research on John, 1st Duke of Marlborough, Sarah, Duchess of Marlborough and Winston Churchill (29); Shane Leslie (2); Lord Ivor Churchill on the use of the Marlborough papers (2); Basil Liddell-Hart (4); Ridley Pakenham-Walsh (13) and Professor Keith Feiling (8) on proof-reading and research for the book; Lord Tyrrell; Ralph Wigram; R B Haselden (3) on letters from Marlborough held in the United States and Edythe Backus (3) on transcriptions of the same; and Herbert Noyes (2).Also contains a copy of a letter from WSC to Charles Scribner on the publication of the book.Other subjects include: research notes, WSC's visits to various battlefields in the Netherlands and information about related documents and archives.