The Korean War started on 25 June 1950 when the army of North Korea led by Kim Il-Sung crossed the 38th parallel and moved south towards Seoul, South Korea. The North advanced rapidly south and took roughly 70% of South Korea before being stopped at the Pusan Perimeter in the southeastern corner of the country. When the United States and United Nations forces counter attacked with the amphibious landings at Inchon, they ended up cutting off the North supply lines and driving north, taking more than half of North Korea until China entered the war. The front lines stayed close to the 38th parallel until a cease fire was signed in July 1953. The US and UN achieved their goal of stopping the advancing communists and reestablishing the status quo of a split communist North and free south Korean Peninsula at the 38th.