Korean reunification selected the 38th parallel as a dividing line. Japanese troops to the North of this line were to surrender to the Soviet Union and troops to the South of this line would surrender to the United States. This was not originally intended to result in a long-lasting partition, but Cold War politics resulted in the establishment of two separate governments in the two zones in 1948 and rising tensions prevented cooperation. The desire of many Koreans for a peaceful unification was dashed when the Korean War broke out in 1950. In June 1950, troops from North Korea invaded South Korea.
Thailand in the Korean War outpost hills along the front line while having a truce talk at Panmunjeom. A typical hill battle was waged at "Porkchop Hill", then held by soldiers of the 21st Thai Infantry Battalion, who repulsed an attack by the Chinese People's Volunteers. After this victory, the United States military awarded one Thai soldier the prestigious Legion of Merit, while 12 received Silver Stars and 26 were awarded a Bronze Star Medal. They were given the nickname "Little Tigers" by General James Van Fleet, commander of the 8th US Army. The Chinese made an all out effort to capture Porkchop Hill, attacking