Most were visible, and mine detectors picked up the metallic igniters of those more deeply buried. Gains of through the 8th carried the 25th Division on the left within of the Inchon- Yongdungp’o road and took the forwardmost force of the 3rd Division at the right within of the Han itself. Beginning on the 6th, Milburn's forces captured troops from the KPA 47th Division in the area north and northeast of Anyang. By the 8th it appeared that all or part of the KPA 17th Division had relieved the 47th at Inchon; that the latter had joined the KPA 8th Division in holding back the I Corps, taking up positions near the center of the corps zone; and that the bulk of the 50th Army was sideslipping to the east. The strongest enemy positions facing the I Corps on the 8th lay between Routes 1 and 55 across heights centered on Kwanak Mountain, due south of Seoul, where the North Korean 47th Division had been identified. Since the Kwanak heights were the last defensible ground on the southern approaches to Seoul, their capture could climax the I Corps advance to the Han. General Ridgway emphasized this probability to General Milburn at a meeting of Corps commanders on the 8th and urged him to push vigorously against the Kwanak defenses. Earlier, after learning of the 47th Division's entry on line, Ridgway asked Admiral C. Turner Joy to arrange an amphibious landing demonstration at Inchon to discourage further strengthening of the KPA screen and perhaps draw off some opposing forces. Joy dispatched ships from Sasebo, Japan, and from Pusan to join those already in Inchon waters for a demonstration on the 10th. Snow and low-hanging clouds shut down air operations on the 9th but had little ill effect on the I Corps. The 25th Division captured Kwanak Mountain and, west of Route 1, advanced its infantry line within of the Inch’on-Yongdungp’o road. Armored forces from the division reconnoitered farther west and north within sight of Inchon and Yongdungp’o. On the Corps' right, the 3rd Division moved north, and a small armored column, "Task Force Meyer", raced up Route 55 to become the first Corps' troops on the Han. Minefields harassed the advance, but assault forces otherwise consistently reported “no resistance.“