<p>Among the military leaders of the Second World War, Grand Admiral Karl Doenitz remains a deeply enigmatic figure. As chief of the German submarine fleet he earned Allied respect as a formidable enemy. But after he succeeded Hitler ? to whom he was unquestioningly loyal ? as head of the Third Reich, his name became associated with all that was most hated in the Nazi regime.<br><br>Yet Doenitz deserves credit for ending the war quickly while try...