The lack of supply and massive losses stopped the North Korean troop’s advancement. Additionally, the lack of aircraft means the most critical items to be imported from China were not successful.
During the Battle of Pusan, North Koreas Korean People Army set to advancement when Taegu was captured. They attempted to envelop the Pusan Perimeter from all sides, but South Koreans resisted. A series of staged attacks on United Nation also collapsed and made the importation hard.