During WWII the mission of the Navy was, first and foremost, 'holding the line' against the German surface fleet, preventing it from disrupting the vital transatlantic sea-lanes or escorting an invasion force to Britain. The importance of holding the line cannot be over-emphasised but it is often overlooked as there was no decisive battle on the seas surrounding Britain in WWII. This work is a strategic and operational history of the Home Fleet. It examines the role of the home fleet in allied strategy and how well the home fleet carried out the missions assigned to it within the framework of that strategy.