While "Missouri"s helicopter searched the projected bombardment track for mines, the UN force formed up for battle. At 1150, when a shell from an unobserved shore battery fell short of the group, it apparently signalled the beginning. "Worcester" hoisted the blue and white UN flag to the foretruck and commenced firing at exactly noon on 12 October. For almost the next 90-odd minutes, "Worcester"s 6-inch guns hammered at iron works and railroad tunnels in the vicinity. The next day, she extended her target list to include railroad marshalling yards, tearing up sections of track and blasting rolling stock.