<Li> Kaesong - Munsan </Li> <Li> Pusan Perimeter <Ul> <Li> Masan </Li> <Li> P'ohang - Dong </Li> <Li> Taegu </Li> <Li> 1st Naktong Bulge </Li> <Li> Bowling Alley </Li> <Li> Battle Mountain </Li> <Li> Kyongju </Li> <Li> Haman </Li> <Li> Nam River </Li> <Li> Ka - San </Li> <Li> Tabu - Dong </Li> <Li> Yongsan </Li> <Li> 2nd Naktong Bulge </Li> </Ul> </Li> <Ul> <Li> Masan </Li> <Li> P'ohang - Dong </Li> <Li> Taegu </Li> <Li> 1st Naktong Bulge </Li> <Li> Bowling Alley </Li> <Li> Battle Mountain </Li> <Li> Kyongju </Li> <Li> Haman </Li> <Li> Nam River </Li> <Li> Ka - San </Li> <Li> Tabu - Dong </Li> <Li> Yongsan </Li> <Li> 2nd Naktong Bulge </Li> </Ul> <Li> P'ohang - Dong </Li>

When did un troops reach the yalu river