Guild ed., 1985. 128 pp., photo-ills., + diagrams & plans. D.j, 24 x 17cm. FINE. On May 15 1957 Valiant XD818 captained by the author of this book, Officer Commanding No 49 Squadron, dropped Britain's first live thermonuclear megaton weapon, a device 70 times more powerful than that exploded over Hiroshima in 1945. Operation ‘Grapple' demonstrated to the world Britain's resolve to protect her democracy with a nuclear deterrent that could be delivered, with precision, by the RAF, to any target within the V-bomber range. Based on first-hand experience this book tells of this huge undertaking.