'Dummy City' Is Set Up I To Fool Bonn Raiders ; BONN, GERMANY. A dummy city complete with a tricky light pattern pat-tern had been set up in the woods outside Bonn in an attempt to deceive de-ceive RAF night raiders, six captured cap-tured Germans disclosed here. It had been in operation for three years. The lights went on each time there was a raid. One of the Germans pulled a switch. The five others took stations with buckets of water to put out any fires the bombs might cause. But every time the bombs fell on Bonn "even after we used sparklers spar-klers and colored lights," a spokesman spokes-man for the prisoners lamented.