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 recommended recruiting a separate Special Force for the Korean War. Recruits for the Special Force were enlisted for a period of eighteen months with recruits coming from both the Active Force, World War II veterans and adventure seeking young men. The normal recruitment standards were lowered since "the army would not wish to retain the 'soldier of fortune' type of personnel on a long term basis'". Units of the Special Force would be second battalions of the existing three Permanent Force regiments. On 15 August 1950, the 2nd Battalion was created within Princess Patricia's Canadian Light Infantry (PPCLI) as a