London: Faber, 1934. Black cloth. (xvi), 352 pp. Library discard, with call numers to lower spine, book plate and small ink marks to endpapers, slight evidence of removed pouch at rear; 1/4 inch tear to head of spine; else a VG clean, tight and unworn jacketless copy. Groves was formerly Director of Flying Operations at the Air Ministry and British Air Representative at the Peace Conference following WWI. He issues a warning to Britain to keep her air defenses up.