Among the greatest developments in conventional war since 1914 has been the rise of air/land power -- the interaction between air forces and armies in military operations. From 1914, a great function of air power has always been its effect on ground combat, something fundamental to land warfare since 1939. This book examines the rise of air/land power and why British and American air forces handled it in a mediocre way until 1940, but by 1942 were leaders in the field. Taking an original approach, it places the study in the context of the development of doctrine and practice in an inter-Allied and inter-service environment, and the evolution of systems of command, control, communications, and intelligence. While previous studies have looked at armoured warfare, Intelligence and Anglo-American Air Support in World War Two aims to treat armoured and air/land warfare as complementary parts of a greater whole. Moreover, it challenges the view that British and American air forces were less important and effective than their German counterparts.