By mid-October 1950, after the successful landing at Inchon by the US X Corps, the Eighth Army breakout from the Pusan Perimeter and the subsequent pursuit and destruction of the Korean People's Army (KPA), the Korean War appeared to be all but over. United Nations (UN) forces advanced rapidly into North Korea with the intention of reuniting North and South Korea before the end of 1950. North Korea is divided through the center by the impassable Taebaek Mountains, which separated the UN forces into two groups. The US Eighth Army advanced north through the western coast of the Korean Peninsula, while the Republic of Korea (ROK) I Corps and the US X Corps advanced north on the eastern coast.