+ A sharp bell rang from the teletype table, cutting across their conversation. A moment later, the machine’s motor engaged, and its type mechanism began to chatter, printing a fresh message on the narrow paper tape. Joshua lifted one eyebrow. “I believe you have orders coming in, Marcus.” After 1940 Britain shifted from defending its own skies to taking the war to Germany. But soon Bomber Command was confronting a serious problem of its own. At night, crews struggled to find their intended targets, let alone bomb them accurately. In 1942, an electronic guidance system called Clarinet was developed. It used two highly directional radio beams, one transmitting Morse-code dots and the other dashes. A bomber could follow the beams to its target, with a single aircraft flying at the head of the bomber stream to reduce the risk of the Germans recovering equipment and learning how the system worked.