They deliberately betrayed the British Mediterranean Fleet, fought a tragic action with unwitting British destroyers, defied the might of the Luftwaffe, the Italian High Command, the Prussian Gestapo, even a crack Wehrmacht paratroop regiment, and all to buy two years of time. They were called the Chatham rats. They wore Italian uniforms, carried cyanide capsules, fought secretly with a fast Italian destroyer they had captured during the Battle of Matapan, and they had one aim - to find and exterminate the men who designed the first guided missile in history - the radio-controlled marine glider bomb.