Military historian John Keegan. His new book, "The Second World War," recounts the strategies and battles of the war by looking at the three major theaters (the West, the East, and the Pacific) in both the early and late years of the war. Keegan, one of today's foremost military historians, is best known for analyzing the effects of war on the individual soldier. He taught for many years at the Royal Military Academy at Sandhurst in Britain, and is now the Defense Correspondent of The Daily Telegraph in London. His other books include, "The Face of Battle," "The Mask of Command," and "The Price of Admiralty." (Interview by Sedge Thomson)