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.
Canada in the Korean War about 30 miles across and was a section of the United Nations front occupied by British Commonwealth forces. Most of the Canadians' combat missions took place on the 30 mile zone. The Canadians' two main adversaries during the war were the North Korean army and the Chinese in the Battle of Kapyong. Canada's military objective was to give military support towards the resolution of the war on the central front, which was central Korea. Operation Killer was a counter-offensive by the United Nations forces to push Communist Chinese and North Korean Armies back behind the Han River and recover the