Fritz Joubert Duquesne , a Boer and German spy , claimed to have assumed the identity of Russian Count Boris Zakrevsky and joined Kitchener in Scotland .
Fritz Joubert Duquesne , a Boer and German spy , claimed to have sabotaged and sunk '' Hampshire '' . 
 Duquesne claimed to have assumed the identity of Russian Duke Boris Zakrevsky and joined Kitchener in Scotland .