This study of the battles waged between 1066 and 1135 by the Anglo-Norman kings of England - William the Conqueror, William Rufus and Henry I -is a major restatement of the nature of medieval warfare in the eleventh and twelfth centuries. Bringing together the two major trends in recent medieval military history, the study of military organisations and the study of campaigns, Stephen Morillo illuminates the interrelationship of military organisation and social and political structures and brings many new perceptions to bear, such as the central role of the familia regis, the King's military household. The roles of armies and castles and the normal activities of warfare are examined to show why sieges were far more common than pitched battles. Siege and battle tactics are analysed in the context of social and political influences, administrative structures and campaign patterns, and a connection is proposed in most pre-modern warfare between government strength and infantry quality. Dr STEPHEN MORILLOteaches at Wabash College, Indiana. He has published numerous articles on Anglo-Norman warfare.