Korean War two years of fighting became a war of attrition, with the front line close to the 38th parallel. The war in the air, however, was never a stalemate. North Korea was subject to a massive bombing campaign. Jet fighters confronted each other in air-to-air combat for the first time in history, and Soviet pilots covertly flew in defense of their communist allies. The fighting ended on 27 July 1953, when an armistice was signed. The agreement created the Korean Demilitarized Zone to separate North and South Korea, and allowed the return of prisoners. However, no peace treaty was ever signed,
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