Book excerpt: The German Generals who survived Hitler's Reich talk over World War II with Capt. Liddell Hart, noted British miltary strategist and writer. They speak as professional soldiers to a man they know and respect. For the first time, answers are revealed to many questions raised during the war. Was Hitler the genius of strategy he seemed to be at first? Why did his Generals never overthrow him? Why did Hitler allow the Dunkirk evacuation? Current interest, of course, focuses on the German Generals' opinion of the Red Army as a fighting force. What did the Russians look like from the German side? How did we look? And what are the advantages and disadvantages under which dictator-controlled armies fight? In vivid, non-technical language, Capt. Liddell Hart reports these interviews and evaluates the vital military lessons of World War II.