In early August, three KPA divisions mounted offensives against the three passes through the area, with the 8th Division attacking Yongch'on, 12th Division attacking P'ohang-dong and 5th Division, in conjunction with the 766th Independent Infantry Regiment, attacking An'gang-ni. The 8th Division drove for Yongch'on from Uiseong, but its attack failed to reach the Taegu-P'ohang corridor after being surprised and outflanked by the ROK 8th Division. This fighting was so heavy that the KPA 8th Division was forced to hold its ground for a week before trying to advance. Stalled again by ROK resistance, it halted to wait for reinforcements. However the other two attacks were more successful, catching the UN forces by surprise.