This is the first of three volumes detailing the history of the Fleet Air Arm, during the Second World War. It deals with the formative period between 1939 and 1941, incorporating an in depth coverage of significant operations, including the Norwegian campaign, and incidents involving the loss of and damage to aircraft carriers, including the sinking of Ark Royal. A wide range of official documents are used to enable the reader to appreciate the complexity of the operations and how the Royal Navy adapted to the use of air power in the Second World War.