Military historian Keegan, author of a definitive history of the first world war, here encapsulates the action, politics and major themes of World War Two. Focusing his narrative on six critical battles -- the battles of Britain, Okinawa, Midway, Berlin, Crete and Falaise -- he elucidates the different types of WWII-era warfare, as well as the Allies' evolving strategic aims. Superbly written, as are all Keegan's books.  (WAR44, $25.00)