 A total of 737 were lost including Kitchener and all the members of the mission to Russia.Fritz Joubert Duquesne – a Boer and German spy – claimed to have assumed the identity of Russian Count Boris Zakrevsky and joined Kitchener in Scotland.Duquesne supposedly signalled a German U-boat shortly after departing Scapa Flow to alert them that Kitchener's ship was approaching.