The RAF did not come of age until the Second World War. The role of its forerunners in the Great War, the Royal Flying Corps and the Royal Naval Air Service, although important, was peripheral to that of the ground forces. The founding father of the RAF, Lord Trenchard, was determined that it should become a fully-fledged third service, equal in status to the Royal Navy and British Army, and this he succeeded in doing between the wars, firstly by setting up the RAF College at Cranwell, and Staff College at Andover, and secondly by providing a cost-effective policeman of the more rebellious parts of the British Empire. By 1939 the RAF had grown substantially, but, of the three best aircraft of the coming War, only the Supermarine Spitfire was in service, as neither the Avro Lancaster nor the De Havilland Mosquito would be available until early 1942\. Aircraft, however, were not enough. It was the leaders of the RAF, the subjects of this book, who would take the battle to the enemy and who, after six long years, would prevail.