North Koreans were all gone, and Kimpo airfield was securely in the hands of the Marines. Kimpo airfield was in excellent shape; the North Koreans had not had time to do any major demolition. In fact, several North Korean planes were still on the field. Kimpo would now become the center of UN land-based air operations. On September 19, US engineers repaired the local railroad up to inland. After the capture of Kimpo airfield, transport planes began flying in gasoline and ordnance for the aircraft stationed there. The Marines continued unloading supplies and reinforcements. By September 22, they had unloaded 6,629 vehicles and 53,882 troops, along with 25,512 tons (23,000 tonnes) of supplies. Battle of Seoul In contrast to the quick victory at Incheon, the advance on Seoul was slow and bloody. The KPA launched another T-34 attack, which was trapped and destroyed, and a Yak bombing run in Incheon harbor, which did little damage. The KPA attempted to stall the UN offensive to allow time to reinforce Seoul and withdraw troops from the south. Although warned that the process of taking Seoul would allow remaining KPA forces in the south to escape, MacArthur felt that he was bound to honor promises given to the South Korean government to retake the capital as soon as possible. On the second day, vessels carrying the 7th Infantry Division arrived in Incheon Harbor. Almond was eager to get the division into position to block a possible KPA movement from the south of Seoul. On the morning of September 18, the division's 2nd Battalion, 32nd Infantry Regiment landed at Incheon and the remainder of the regiment went ashore later in the day. The next morning, the 2nd Battalion moved up to relieve a Marine battalion occupying positions on the right flank south of Seoul. Meanwhile, the 7th Division's 31st Infantry Regiment came ashore at Incheon. Responsibility for the zone south of Seoul highway passed to the 7th Division at 18:00 on September 19. The 7th Infantry Division then engaged in heavy fighting with KPA forces on the outskirts of Seoul. Before the battle, North Korea had just one understrength division in the city, with the majority of its forces south of the capital. MacArthur personally oversaw the 1st Marine Regiment as it fought through KPA positions on the road to Seoul. Control of Operation Chromite was then given to Almond, the X Corps commander.