 with almost 5,000 tons of bombs dropped on the city in a March 12th raid. On the air front today, Royal Air Force bombers have knocked the German cities of Dortmund and Essen to bits in two of their greatest daylight attacks of the war. On March 15th, the largest bomb produced during the war is dropped for the first time. Known as the Grand Slam, the 22,000-pound bomb is dropped on the Beifeld Viaduct by British Lancaster bombers.