This is the official RAF manual for the conduct of operation from 1940. Its chapters include the employment and control of the armed forces, command, leadership and morale, the principles of air warfare, characteristics of air forces, air warfare, the strategic air offensive and defensive, operations in support of the navy and the army, air intelligence and operations in unadministered and undeveloped areas (never let it be said that the British forgot the lees fortunate!) In all it is a doctrinal manual which proposes many ethical concepts which soon fell by the wayside when the going got rough. Of great interest to air historians wishing to establish the ethos of British air thought in 1940.