Peter Schenk is a member of Berlin's Groener Group and spent months researching Operation Sealion at Freiburg's Military Archives. He has written and co-authored five books about German landing craft, netlayers and the fleets of World War I and World War II. He has written numerous articles in _After The Battle_ magazine, as well as in German magazines. Sonke Neitzel is Professor of Modern History at the University of Potsdam and Glasgow. Since 1994 he has been specialist adviser in history to the German ZDF television Network. He is the author of a number of books on World War II, including _Kriegsausbruch_ and _Weltmacht oder Untergang_.