What did John Keegan write?

John Keegan wrote The Mask of Command, Winston Churchill, The Second World War, The First World War, The Face of Battle: A Study of Agincourt, Waterloo, and the Somme, A History of Warfare, Six Armies in Normandy, Intelligence in War, The American Civil War: A Military History and The Price of Admiralty: The Evolution of Naval Warfare from Trafalgar to Midway.