Aden, 20 June 1967: two army Land Rovers burn ferociously in the midday sun. The bodies of British soldiers litter the road. Thick black smoke bellows above Crater town, home to insurgents who are fighting the British-backed Federation government. Crater had come to symbolise Arab nationalist defiance in the face of the world's most powerful empire. Hovering 2,000 ft. above the smouldering destruction, a tiny Scout helicopter surveys the scene. Its passenger is the recently arrived Commanding Officer of the Argyll and Sutherland Highlanders, Lieutenant-Colonel Colin Mitchell. Soon the world's...