My thanks first of all to the British Academy for a grant which helped me to undertake the initial, exploratory research. I am also grateful to the archivists and staff of the various record repositories where I have worked: the Bundesarchiv in Berlin/Lichterfelde, the Bundesarchiv/Militärarchiv in Freiburg, the Bibliothek für Zeitgeschichte in Stuttgart, the Bayerisches Hauptstaatsarchiv and Staatsarchiv München, the Staatsarchiv Augsburg, the International Tracing Service, Bad Arolsen, the National Archives in London, the Imperial War Museum at Duxford, and the Liddell Hart Centre for Military Archives in King’s College, London. At the Bibliothek für Zeitgeschichte in Stuttgart, part of the Württembergische Landesbibliothek, I had every reason to be most grateful for the help and advice of the library’s director and good friend of mine, Professor Gerhard Hirschfeld, and the head of its archival collections, Dr Irina Renz. Dr Susanne Urban was most helpful in guiding me through the extensive sources related to the death marches—only recently opened to researchers—at the International Tracing Service in Bad Arolsen, where I would also like to express my thanks to the director, M. Jean-Luc Blondel. At Duxford, I benefited greatly from Dr Stephen Walton’s expert assistance in consulting the valuable holdings of German documents. I started, and finished, the research for the book in the incomparable Institut für Zeitgeschichte in Munich, where I have had the good fortune to be a welcome guest for many years, and I would like to express my warmest thanks to the director, Professor Horst Möller, and his colleagues, especially the library and archives staff, who as always dealt with my many requests with unfailing courtesy and friendliness.
Professor Otto Dov Kulka (Jerusalem), a highly esteemed colleague and friend with whom I have shared a lengthy and fruitful correspondence over many years, first pointed me in the direction of the records at Bad Arolsen. Beyond that, as ever I have been extremely grateful for his interest in my work, and for his valuable suggestions. Laurence Rees, good friend and brilliant producer of television documentaries, was kind enough to make available to me relevant transcripts of interviews, kept in the BBC Archives in London, from one of the series on which we collaborated, offered excellent advice, and was as always stimulating company, cheerfully helpful and most encouraging.
Numerous other friends and colleagues also helped, sometimes perhaps without being aware of how helpful they had been. Among them, I owe thanks to Professor Daniel Blatman (Jerusalem), for answering a number of queries about the death marches, and for related material which he kindly sent me. Dr Andreas Kunz, of the Bundesarchiv/Militärarchiv in Freiburg, gave me some valuable tips on relevant archival holdings on my first visit there in connection with this project. Dr Heinrich Schwendemann of the University of Freiburg most generously went to great lengths to send me documents related to the French occupation of south-west Germany in 1945 and other relevant material that was not easy for me to access. Other colleagues who also supplied me with documents, papers or other materials, provided answers to my questions, or made me think more clearly about what I was attempting include Professor John Breuilly, Dr Michael Buddrus, Mr George Burton, Dr Simone Erpel, Dr Wolfgang Holl, Dr Holger Impekoven, Professor Tim Kirk, Dr Michael Kloft, Dr Alexander Korb, Mr Michael D. Miller, Professor Bob Moore (who went to undue trouble to send me a batch of documents on a specific point related to the Netherlands, his chief area of expertise), Professor Jonathan Steinberg, Dr Klaus Wiegrefe and Dr Benjamin Ziemann. I am glad of the opportunity to extend my warm thanks to all and apologize to anyone whom I have inadvertently omitted.
As I was feeling my way into the project, I benefited enormously, as always, from lengthy discussions with long-standing German friends, Professor Hans Mommsen (Feldafing), Professor Norbert Frei (Jena), Dr Hermann Graml and Dr Elke Fröhlich (Munich), all of whom helped me greatly in shaping my ideas. I am most grateful to each of them.
Two scholars and friends I want to thank especially. Dr Jürgen Förster, a fine historian and notable expert on the Wehrmacht at the Bundesarchiv/Militärarchiv in Freiburg, answered numerous queries, directed me to important records, and, not least, read and commented on the completed typescript. Dr Nick Stargardt, Magdalen College, Oxford, who is currently working on what will be an important study of German society during the war, has been full of penetrating insights throughout. He also took the time and trouble to read the entire typescript and make numerous valuable suggestions. I am most grateful to both. Of course it needs to be added, as always, that responsibility for any remaining errors is my own.