The "forgotten offensive" of the title is RAF Coastal Command's offensive against German sea-trade between 1940 and 1945. The fortunes of the campaign are followed throughout the war, and its success is then evaluated in terms of the shipping sunk, and the impact on the German economy.
This book argues that the preoccupation with strategic bombing doctrine was responsible for the lack of an offence on Germany's merchant shipping, resulting in the effective exclusion of all other ideas on the employment of air power.